https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

On 2022/07/25 6:44 p.m., Anthony William Sloman wrote:
> On Tuesday, July 26, 2022 at 11:27:57 AM UTC+10, jla...@highlandsniptechnology.com wrote:
>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>
> https://en.wikipedia.org/wiki/Cockcroft%E2%80%93Walton_generator
>
> If you are going to re-invent the wheel, find a better name for it. Voltage doubler is less pretentious than "binary voltage multiplier".
>

Well, he is getting more than double the voltage out of the Walton
generator, depending on which switches are closed. I've called this a
charge pump supply, but perhaps I was using the wrong name. Nice to know
the actual name of this style of voltage multiplier.

Someone should ask "Kathy Loves Physics" (youtube) to do an episode on
the voltage multiplier as most of her presentations relate to electricity...

John :-#)#

jlarkin@highlandsniptechnology.com wrote:
>
> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>
Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>jlarkin@highlandsniptechnology.com wrote:
>>
>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>
>Fun. Of course with the right parts, you can do 2**N multiplication
>with N stages. (Does require using the relays for commutation, of course.)
>
>Cheers
>
>Phil Hobbs

This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

I probably won't actually do this, unless a certain customer gets
serious, which is unlikely. I was just doodling.

We could go into the multichannel high-voltage supply business with
our new power rack, but lots of people are in that biz already.

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
> <pcdhSpamM...@electrooptical.net> wrote:
>
> >jla...@highlandsniptechnology.com wrote:
> >>
> >> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
> >>
> >Fun. Of course with the right parts, you can do 2**N multiplication
> >with N stages. (Does require using the relays for commutation, of course.)
> >
> >Cheers
> >
> >Phil Hobbs
> This circuit can do a 2^N step high-voltage supply with N low voltage,
> cheap telecom relays. Maybe an incremental linear reg could
> interpolate between the steps.

regulate the input?

On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

>tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>> <pcdhSpamM...@electrooptical.net> wrote:
>>
>> >jla...@highlandsniptechnology.com wrote:
>> >>
>> >> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>> >>
>> >Fun. Of course with the right parts, you can do 2**N multiplication
>> >with N stages. (Does require using the relays for commutation, of course.)
>> >
>> >Cheers
>> >
>> >Phil Hobbs
>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>> cheap telecom relays. Maybe an incremental linear reg could
>> interpolate between the steps.
>
>regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I'd rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

jlarkin@highlandsniptechnology.com wrote:
> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> jlarkin@highlandsniptechnology.com wrote:
>>>
>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>
>> Fun. Of course with the right parts, you can do 2**N multiplication
>> with N stages. (Does require using the relays for commutation, of course.)
>>
>> Cheers
>>
>> Phil Hobbs
>
> This circuit can do a 2^N step high-voltage supply with N low voltage,
> cheap telecom relays. Maybe an incremental linear reg could
> interpolate between the steps.
>
> I probably won't actually do this, unless a certain customer gets
> serious, which is unlikely. I was just doodling.
>
> We could go into the multichannel high-voltage supply business with
> our new power rack, but lots of people are in that biz already.
>

You still only get N-times multiplication at most, though. The 2**N
multiplication scheme runs each voltage doubler off the output of the
previous one.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Phil Hobbs wrote:
> jlarkin@highlandsniptechnology.com wrote:
>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>> jlarkin@highlandsniptechnology.com wrote:
>>>>
>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>
>>> Fun.  Of course with the right parts, you can do 2**N multiplication
>>> with N stages.  (Does require using the relays for commutation, of
>>> course.)
>>>
>>> Cheers
>>>
>>> Phil Hobbs
>>
>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>> cheap telecom relays. Maybe an incremental linear reg could
>> interpolate between the steps.
>>
>> I probably won't actually do this, unless a certain customer gets
>> serious, which is unlikely. I was just doodling.
>>
>> We could go into the multichannel high-voltage supply business with
>> our new power rack, but lots of people are in that biz already.
>>
>
> You still only get N-times multiplication at most, though.  The 2**N
> multiplication scheme runs each voltage doubler off the output of the
> previous one.

(We're using different definitions of N here, of course--I'm talking N
CW sections and you're talking N relays, with the nth one switching 2^n
sections, for 0 <= n < N.)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

On 7/26/2022 10:19 AM, jlarkin@highlandsniptechnology.com wrote:
> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
> <langwadt@fonz.dk> wrote:
>
>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>
>>>> jla...@highlandsniptechnology.com wrote:
>>>>>
>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>>
>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>>>> with N stages. (Does require using the relays for commutation, of course.)
>>>>
>>>> Cheers
>>>>
>>>> Phil Hobbs
>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>>> cheap telecom relays. Maybe an incremental linear reg could
>>> interpolate between the steps.
>>
>> regulate the input?
>
> Sure. The source could be something like an LTC3803 (geat part) and a
> standard transformer, one of the DRQ things.
>
> We had one inquiry for a HV supply that was pretty time-agile, which
> would need a linear reg.
>
> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>
> This stepped C-W was just a goofy idea.
>
This topology uses isolation transformers with dual secondaries:

<https://imgur.com/a/XRoYq2V>

I _think_ I got the dots right...

On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <user@example.net> wrote:

>On 7/26/2022 10:19 AM, jlarkin@highlandsniptechnology.com wrote:
>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>> <langwadt@fonz.dk> wrote:
>>
>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>
>>>>> jla...@highlandsniptechnology.com wrote:
>>>>>>
>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>>>
>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>>>>> with N stages. (Does require using the relays for commutation, of course.)
>>>>>
>>>>> Cheers
>>>>>
>>>>> Phil Hobbs
>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>>>> cheap telecom relays. Maybe an incremental linear reg could
>>>> interpolate between the steps.
>>>
>>> regulate the input?
>>
>> Sure. The source could be something like an LTC3803 (geat part) and a
>> standard transformer, one of the DRQ things.
>>
>> We had one inquiry for a HV supply that was pretty time-agile, which
>> would need a linear reg.
>>
>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>>
>> This stepped C-W was just a goofy idea.
>>
>This topology uses isolation transformers with dual secondaries:
>
><https://imgur.com/a/XRoYq2V>
>
>I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.

Lately we don't run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.

On 7/27/2022 5:08 AM, jlarkin@highlandsniptechnology.com wrote:
> On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <user@example.net> wrote:
>
>> On 7/26/2022 10:19 AM, jlarkin@highlandsniptechnology.com wrote:
>>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>>> <langwadt@fonz.dk> wrote:
>>>
>>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>>
>>>>>> jla...@highlandsniptechnology.com wrote:
>>>>>>>
>>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>>>>
>>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>>>>>> with N stages. (Does require using the relays for commutation, of course.)
>>>>>>
>>>>>> Cheers
>>>>>>
>>>>>> Phil Hobbs
>>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>>>>> cheap telecom relays. Maybe an incremental linear reg could
>>>>> interpolate between the steps.
>>>>
>>>> regulate the input?
>>>
>>> Sure. The source could be something like an LTC3803 (geat part) and a
>>> standard transformer, one of the DRQ things.
>>>
>>> We had one inquiry for a HV supply that was pretty time-agile, which
>>> would need a linear reg.
>>>
>>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>>>
>>> This stepped C-W was just a goofy idea.
>>>
>> This topology uses isolation transformers with dual secondaries:
>>
>> <https://imgur.com/a/XRoYq2V>
>>
>> I _think_ I got the dots right...
>
> I think that untangles into a 360 volt transformer and a half-wave
> doubler.

Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.

> Lately we don't run line AC into boxes, or use line frequency
> transformers. Too many safety and compliance isues, too much weight
> and cost.

Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so and those CUI-type modules can
take you most places you need to go initially from there, on the board.
The client can use their UL-listed off-line PSU of choice if that's
important to them.

I forget exactly how many units UL wants to test to destruction these
days just as a minimum requirement for a cert I think it's at least three.

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
> > On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
> >
> >> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
> >>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
> >>> <lang...@fonz.dk> wrote:
> >>>
> >>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
> >>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
> >>>>> <pcdhSpamM...@electrooptical.net> wrote:
> >>>>>
> >>>>>> jla...@highlandsniptechnology.com wrote:
> >>>>>>>
> >>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
> >>>>>>>
> >>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
> >>>>>> with N stages. (Does require using the relays for commutation, of course.)
> >>>>>>
> >>>>>> Cheers
> >>>>>>
> >>>>>> Phil Hobbs
> >>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
> >>>>> cheap telecom relays. Maybe an incremental linear reg could
> >>>>> interpolate between the steps.
> >>>>
> >>>> regulate the input?
> >>>
> >>> Sure. The source could be something like an LTC3803 (geat part) and a
> >>> standard transformer, one of the DRQ things.
> >>>
> >>> We had one inquiry for a HV supply that was pretty time-agile, which
> >>> would need a linear reg.
> >>>
> >>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
> >>>
> >>> This stepped C-W was just a goofy idea.
> >>>
> >> This topology uses isolation transformers with dual secondaries:
> >>
> >> <https://imgur.com/a/XRoYq2V>
> >>
> >> I _think_ I got the dots right...
> >
> > I think that untangles into a 360 volt transformer and a half-wave
> > doubler.
> Ya that sounds right. An old trick in the National Semi handbook from
> the 70s I think it was, for regulation on the secondary is to wrap an
> LM317 inside the grid to cathode voltage of a power triode and that
> works OK for regulating up to a couple kV at low currents without too
> much thought on how to provide an appropriate reference and error amp
> for the potentials on that side.
>
> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
> > Lately we don't run line AC into boxes, or use line frequency
> > transformers. Too many safety and compliance isues, too much weight
> > and cost.
> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
> readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

On 7/28/2022 2:35 AM, Lasse Langwadt Christensen wrote:
> torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
>> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
>>> On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
>>>
>>>> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
>>>>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>>>>> <lang...@fonz.dk> wrote:
>>>>>
>>>>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>>>>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>>>>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>>>>
>>>>>>>> jla...@highlandsniptechnology.com wrote:
>>>>>>>>>
>>>>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>>>>>>
>>>>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>>>>>>>> with N stages. (Does require using the relays for commutation, of course.)
>>>>>>>>
>>>>>>>> Cheers
>>>>>>>>
>>>>>>>> Phil Hobbs
>>>>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>>>>>>> cheap telecom relays. Maybe an incremental linear reg could
>>>>>>> interpolate between the steps.
>>>>>>
>>>>>> regulate the input?
>>>>>
>>>>> Sure. The source could be something like an LTC3803 (geat part) and a
>>>>> standard transformer, one of the DRQ things.
>>>>>
>>>>> We had one inquiry for a HV supply that was pretty time-agile, which
>>>>> would need a linear reg.
>>>>>
>>>>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>>>>>
>>>>> This stepped C-W was just a goofy idea.
>>>>>
>>>> This topology uses isolation transformers with dual secondaries:
>>>>
>>>> <https://imgur.com/a/XRoYq2V>
>>>>
>>>> I _think_ I got the dots right...
>>>
>>> I think that untangles into a 360 volt transformer and a half-wave
>>> doubler.
>> Ya that sounds right. An old trick in the National Semi handbook from
>> the 70s I think it was, for regulation on the secondary is to wrap an
>> LM317 inside the grid to cathode voltage of a power triode and that
>> works OK for regulating up to a couple kV at low currents without too
>> much thought on how to provide an appropriate reference and error amp
>> for the potentials on that side.
>>
>> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
>>> Lately we don't run line AC into boxes, or use line frequency
>>> transformers. Too many safety and compliance isues, too much weight
>>> and cost.
>> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
>> readily available up to 100 watts or so
>
> much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
>

Dat's a beefy brick.

The downside from a user's perspective is once you start trying to rack
up a number of boxes with wall warts and external bricks you start
wishing they had internal PSUs again, kettle leads and IECs are much
more pleasant from a cable management perspective

On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

>torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
>> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
>> > On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
>> >
>> >> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
>> >>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>> >>> <lang...@fonz.dk> wrote:
>> >>>
>> >>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>> >>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>> >>>>> <pcdhSpamM...@electrooptical.net> wrote:
>> >>>>>
>> >>>>>> jla...@highlandsniptechnology.com wrote:
>> >>>>>>>
>> >>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>> >>>>>>>
>> >>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>> >>>>>> with N stages. (Does require using the relays for commutation, of course.)
>> >>>>>>
>> >>>>>> Cheers
>> >>>>>>
>> >>>>>> Phil Hobbs
>> >>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>> >>>>> cheap telecom relays. Maybe an incremental linear reg could
>> >>>>> interpolate between the steps.
>> >>>>
>> >>>> regulate the input?
>> >>>
>> >>> Sure. The source could be something like an LTC3803 (geat part) and a
>> >>> standard transformer, one of the DRQ things.
>> >>>
>> >>> We had one inquiry for a HV supply that was pretty time-agile, which
>> >>> would need a linear reg.
>> >>>
>> >>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>> >>>
>> >>> This stepped C-W was just a goofy idea.
>> >>>
>> >> This topology uses isolation transformers with dual secondaries:
>> >>
>> >> <https://imgur.com/a/XRoYq2V>
>> >>
>> >> I _think_ I got the dots right...
>> >
>> > I think that untangles into a 360 volt transformer and a half-wave
>> > doubler.
>> Ya that sounds right. An old trick in the National Semi handbook from
>> the 70s I think it was, for regulation on the secondary is to wrap an
>> LM317 inside the grid to cathode voltage of a power triode and that
>> works OK for regulating up to a couple kV at low currents without too
>> much thought on how to provide an appropriate reference and error amp
>> for the potentials on that side.
>>
>> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
>> > Lately we don't run line AC into boxes, or use line frequency
>> > transformers. Too many safety and compliance isues, too much weight
>> > and cost.
>> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
>> readily available up to 100 watts or so
>
>much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.

jlarkin@highlandsniptechnology.com wrote:
> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
> <langwadt@fonz.dk> wrote:
>
>> torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
>>> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
>>>> On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
>>>>
>>>>> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
>>>>>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>>>>>> <lang...@fonz.dk> wrote:
>>>>>>
>>>>>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>>>>>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>>>>>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>>>>>
>>>>>>>>> jla...@highlandsniptechnology.com wrote:
>>>>>>>>>>
>>>>>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>>>>>>>
>>>>>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>>>>>>>>> with N stages. (Does require using the relays for commutation, of course.)
>>>>>>>>>
>>>>>>>>> Cheers
>>>>>>>>>
>>>>>>>>> Phil Hobbs
>>>>>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>>>>>>>> cheap telecom relays. Maybe an incremental linear reg could
>>>>>>>> interpolate between the steps.
>>>>>>>
>>>>>>> regulate the input?
>>>>>>
>>>>>> Sure. The source could be something like an LTC3803 (geat part) and a
>>>>>> standard transformer, one of the DRQ things.
>>>>>>
>>>>>> We had one inquiry for a HV supply that was pretty time-agile, which
>>>>>> would need a linear reg.
>>>>>>
>>>>>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>>>>>>
>>>>>> This stepped C-W was just a goofy idea.
>>>>>>
>>>>> This topology uses isolation transformers with dual secondaries:
>>>>>
>>>>> <https://imgur.com/a/XRoYq2V>
>>>>>
>>>>> I _think_ I got the dots right...
>>>>
>>>> I think that untangles into a 360 volt transformer and a half-wave
>>>> doubler.
>>> Ya that sounds right. An old trick in the National Semi handbook from
>>> the 70s I think it was, for regulation on the secondary is to wrap an
>>> LM317 inside the grid to cathode voltage of a power triode and that
>>> works OK for regulating up to a couple kV at low currents without too
>>> much thought on how to provide an appropriate reference and error amp
>>> for the potentials on that side.
>>>
>>> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
>>>> Lately we don't run line AC into boxes, or use line frequency
>>>> transformers. Too many safety and compliance isues, too much weight
>>>> and cost.
>>> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
>>> readily available up to 100 watts or so
>>
>> much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
>
> Phihomg and MeanWell make warts (big plugs) at 60 watts.
>

All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

torsdag den 28. juli 2022 kl. 16.23.22 UTC+2 skrev jla...@highlandsniptechnology.com:
> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
> <lang...@fonz.dk> wrote:
>
> >torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
> >> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
> >> > On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
> >> >
> >> >> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
> >> >>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
> >> >>> <lang...@fonz.dk> wrote:
> >> >>>
> >> >>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
> >> >>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
> >> >>>>> <pcdhSpamM...@electrooptical.net> wrote:
> >> >>>>>
> >> >>>>>> jla...@highlandsniptechnology.com wrote:
> >> >>>>>>>
> >> >>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
> >> >>>>>>>
> >> >>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
> >> >>>>>> with N stages. (Does require using the relays for commutation, of course.)
> >> >>>>>>
> >> >>>>>> Cheers
> >> >>>>>>
> >> >>>>>> Phil Hobbs
> >> >>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
> >> >>>>> cheap telecom relays. Maybe an incremental linear reg could
> >> >>>>> interpolate between the steps.
> >> >>>>
> >> >>>> regulate the input?
> >> >>>
> >> >>> Sure. The source could be something like an LTC3803 (geat part) and a
> >> >>> standard transformer, one of the DRQ things.
> >> >>>
> >> >>> We had one inquiry for a HV supply that was pretty time-agile, which
> >> >>> would need a linear reg.
> >> >>>
> >> >>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
> >> >>>
> >> >>> This stepped C-W was just a goofy idea.
> >> >>>
> >> >> This topology uses isolation transformers with dual secondaries:
> >> >>
> >> >> <https://imgur.com/a/XRoYq2V>
> >> >>
> >> >> I _think_ I got the dots right...
> >> >
> >> > I think that untangles into a 360 volt transformer and a half-wave
> >> > doubler.
> >> Ya that sounds right. An old trick in the National Semi handbook from
> >> the 70s I think it was, for regulation on the secondary is to wrap an
> >> LM317 inside the grid to cathode voltage of a power triode and that
> >> works OK for regulating up to a couple kV at low currents without too
> >> much thought on how to provide an appropriate reference and error amp
> >> for the potentials on that side.
> >>
> >> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
> >> > Lately we don't run line AC into boxes, or use line frequency
> >> > transformers. Too many safety and compliance isues, too much weight
> >> > and cost.
> >> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
> >> readily available up to 100 watts or so
> >
> >much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
> Phihomg and MeanWell make warts (big plugs) at 60 watts.

lots of 65W USB-C chargers like this: https://www.pricerunner.dk/product/640x640/3002755304/Baseus-GaN2-Lite-Quick-Charge-Travel-Charger.jpg

On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>jlarkin@highlandsniptechnology.com wrote:
>> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
>> <langwadt@fonz.dk> wrote:
>>
>>> torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
>>>> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
>>>>> On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
>>>>>
>>>>>> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
>>>>>>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>>>>>>> <lang...@fonz.dk> wrote:
>>>>>>>
>>>>>>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>>>>>>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>>>>>>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>>>>>>
>>>>>>>>>> jla...@highlandsniptechnology.com wrote:
>>>>>>>>>>>
>>>>>>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>>>>>>>>
>>>>>>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>>>>>>>>>> with N stages. (Does require using the relays for commutation, of course.)
>>>>>>>>>>
>>>>>>>>>> Cheers
>>>>>>>>>>
>>>>>>>>>> Phil Hobbs
>>>>>>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>>>>>>>>> cheap telecom relays. Maybe an incremental linear reg could
>>>>>>>>> interpolate between the steps.
>>>>>>>>
>>>>>>>> regulate the input?
>>>>>>>
>>>>>>> Sure. The source could be something like an LTC3803 (geat part) and a
>>>>>>> standard transformer, one of the DRQ things.
>>>>>>>
>>>>>>> We had one inquiry for a HV supply that was pretty time-agile, which
>>>>>>> would need a linear reg.
>>>>>>>
>>>>>>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>>>>>>>
>>>>>>> This stepped C-W was just a goofy idea.
>>>>>>>
>>>>>> This topology uses isolation transformers with dual secondaries:
>>>>>>
>>>>>> <https://imgur.com/a/XRoYq2V>
>>>>>>
>>>>>> I _think_ I got the dots right...
>>>>>
>>>>> I think that untangles into a 360 volt transformer and a half-wave
>>>>> doubler.
>>>> Ya that sounds right. An old trick in the National Semi handbook from
>>>> the 70s I think it was, for regulation on the secondary is to wrap an
>>>> LM317 inside the grid to cathode voltage of a power triode and that
>>>> works OK for regulating up to a couple kV at low currents without too
>>>> much thought on how to provide an appropriate reference and error amp
>>>> for the potentials on that side.
>>>>
>>>> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
>>>>> Lately we don't run line AC into boxes, or use line frequency
>>>>> transformers. Too many safety and compliance isues, too much weight
>>>>> and cost.
>>>> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
>>>> readily available up to 100 watts or so
>>>
>>> much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
>>
>> Phihomg and MeanWell make warts (big plugs) at 60 watts.
>>
>
>All you need is a power bar with the outlets in the right orientation.
>The one over my bench is a very nice 20x Tripplite one, with filtering
>and MOVs, but the prongs are oriented horizontally, so that most warts
>take up two spaces.
>
>Cheers
>
>Phil Hobbs

We're shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

It pulls about 2 amps until the giant EOM oven heats up, maybe 15
minutes.

The power connector on the back is the usual barrel, but it's threaded
for optional mechanical locking.

On Thu, 28 Jul 2022 08:33:17 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

>torsdag den 28. juli 2022 kl. 16.23.22 UTC+2 skrev jla...@highlandsniptechnology.com:
>> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
>> <lang...@fonz.dk> wrote:
>>
>> >torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
>> >> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
>> >> > On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
>> >> >
>> >> >> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
>> >> >>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>> >> >>> <lang...@fonz.dk> wrote:
>> >> >>>
>> >> >>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>> >> >>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>> >> >>>>> <pcdhSpamM...@electrooptical.net> wrote:
>> >> >>>>>
>> >> >>>>>> jla...@highlandsniptechnology.com wrote:
>> >> >>>>>>>
>> >> >>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>> >> >>>>>>>
>> >> >>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>> >> >>>>>> with N stages. (Does require using the relays for commutation, of course.)
>> >> >>>>>>
>> >> >>>>>> Cheers
>> >> >>>>>>
>> >> >>>>>> Phil Hobbs
>> >> >>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>> >> >>>>> cheap telecom relays. Maybe an incremental linear reg could
>> >> >>>>> interpolate between the steps.
>> >> >>>>
>> >> >>>> regulate the input?
>> >> >>>
>> >> >>> Sure. The source could be something like an LTC3803 (geat part) and a
>> >> >>> standard transformer, one of the DRQ things.
>> >> >>>
>> >> >>> We had one inquiry for a HV supply that was pretty time-agile, which
>> >> >>> would need a linear reg.
>> >> >>>
>> >> >>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>> >> >>>
>> >> >>> This stepped C-W was just a goofy idea.
>> >> >>>
>> >> >> This topology uses isolation transformers with dual secondaries:
>> >> >>
>> >> >> <https://imgur.com/a/XRoYq2V>
>> >> >>
>> >> >> I _think_ I got the dots right...
>> >> >
>> >> > I think that untangles into a 360 volt transformer and a half-wave
>> >> > doubler.
>> >> Ya that sounds right. An old trick in the National Semi handbook from
>> >> the 70s I think it was, for regulation on the secondary is to wrap an
>> >> LM317 inside the grid to cathode voltage of a power triode and that
>> >> works OK for regulating up to a couple kV at low currents without too
>> >> much thought on how to provide an appropriate reference and error amp
>> >> for the potentials on that side.
>> >>
>> >> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
>> >> > Lately we don't run line AC into boxes, or use line frequency
>> >> > transformers. Too many safety and compliance isues, too much weight
>> >> > and cost.
>> >> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
>> >> readily available up to 100 watts or so
>> >
>> >much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
>> Phihomg and MeanWell make warts (big plugs) at 60 watts.
>
>lots of 65W USB-C chargers like this: https://www.pricerunner.dk/product/640x640/3002755304/Baseus-GaN2-Lite-Quick-Charge-Travel-Charger.jpg

Yikes. GaN fets are changing things. I wonder what the switching
frequency is.

What's the output voltage? Surely not 5.

jlarkin@highlandsniptechnology.com wrote:
> On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> jlarkin@highlandsniptechnology.com wrote:
>>> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
>>> <langwadt@fonz.dk> wrote:
>>>
>>>> torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
>>>>> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
>>>>>> On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
>>>>>>
>>>>>>> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
>>>>>>>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>>>>>>>> <lang...@fonz.dk> wrote:
>>>>>>>>
>>>>>>>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>>>>>>>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>>>>>>>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>>>>>>>
>>>>>>>>>>> jla...@highlandsniptechnology.com wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>>>>>>>>>
>>>>>>>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>>>>>>>>>>> with N stages. (Does require using the relays for commutation, of course.)
>>>>>>>>>>>
>>>>>>>>>>> Cheers
>>>>>>>>>>>
>>>>>>>>>>> Phil Hobbs
>>>>>>>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>>>>>>>>>> cheap telecom relays. Maybe an incremental linear reg could
>>>>>>>>>> interpolate between the steps.
>>>>>>>>>
>>>>>>>>> regulate the input?
>>>>>>>>
>>>>>>>> Sure. The source could be something like an LTC3803 (geat part) and a
>>>>>>>> standard transformer, one of the DRQ things.
>>>>>>>>
>>>>>>>> We had one inquiry for a HV supply that was pretty time-agile, which
>>>>>>>> would need a linear reg.
>>>>>>>>
>>>>>>>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>>>>>>>>
>>>>>>>> This stepped C-W was just a goofy idea.
>>>>>>>>
>>>>>>> This topology uses isolation transformers with dual secondaries:
>>>>>>>
>>>>>>> <https://imgur.com/a/XRoYq2V>
>>>>>>>
>>>>>>> I _think_ I got the dots right...
>>>>>>
>>>>>> I think that untangles into a 360 volt transformer and a half-wave
>>>>>> doubler.
>>>>> Ya that sounds right. An old trick in the National Semi handbook from
>>>>> the 70s I think it was, for regulation on the secondary is to wrap an
>>>>> LM317 inside the grid to cathode voltage of a power triode and that
>>>>> works OK for regulating up to a couple kV at low currents without too
>>>>> much thought on how to provide an appropriate reference and error amp
>>>>> for the potentials on that side.
>>>>>
>>>>> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
>>>>>> Lately we don't run line AC into boxes, or use line frequency
>>>>>> transformers. Too many safety and compliance isues, too much weight
>>>>>> and cost.
>>>>> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
>>>>> readily available up to 100 watts or so
>>>>
>>>> much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
>>>
>>> Phihomg and MeanWell make warts (big plugs) at 60 watts.
>>>
>>
>> All you need is a power bar with the outlets in the right orientation.
>> The one over my bench is a very nice 20x Tripplite one, with filtering
>> and MOVs, but the prongs are oriented horizontally, so that most warts
>> take up two spaces.
>>
>> Cheers
>>
>> Phil Hobbs
>
> We're shipping rackmount boxes to a big govt facility. They have a
> group in charge of safety and compliance and all that stuff and would
> have set us back 6 months and maybe $40K in lab fees if we ran AC into
> the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
> problem... no complaints from the users.

Yeah, we use warts too. Our standard one is an SL Power ME10A2403B01,
which comes with international plug adapters. It's overkill for most of
our stuff, except for some of the beefier TE coolers.

>
> https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

Very pretty.

>
> It pulls about 2 amps until the giant EOM oven heats up, maybe 15
> minutes.
>
> The power connector on the back is the usual barrel, but it's threaded
> for optional mechanical locking.

It's a drag when those fall out, for sure.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

torsdag den 28. juli 2022 kl. 17.38.47 UTC+2 skrev jla...@highlandsniptechnology.com:
> On Thu, 28 Jul 2022 08:33:17 -0700 (PDT), Lasse Langwadt Christensen
> <lang...@fonz.dk> wrote:
>
> >torsdag den 28. juli 2022 kl. 16.23.22 UTC+2 skrev jla...@highlandsniptechnology.com:
> >> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
> >> <lang...@fonz.dk> wrote:
> >>
> >> >torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
> >> >> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
> >> >> > On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
> >> >> >
> >> >> >> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
> >> >> >>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
> >> >> >>> <lang...@fonz.dk> wrote:
> >> >> >>>
> >> >> >>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
> >> >> >>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
> >> >> >>>>> <pcdhSpamM...@electrooptical.net> wrote:
> >> >> >>>>>
> >> >> >>>>>> jla...@highlandsniptechnology.com wrote:
> >> >> >>>>>>>
> >> >> >>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
> >> >> >>>>>>>
> >> >> >>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
> >> >> >>>>>> with N stages. (Does require using the relays for commutation, of course.)
> >> >> >>>>>>
> >> >> >>>>>> Cheers
> >> >> >>>>>>
> >> >> >>>>>> Phil Hobbs
> >> >> >>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
> >> >> >>>>> cheap telecom relays. Maybe an incremental linear reg could
> >> >> >>>>> interpolate between the steps.
> >> >> >>>>
> >> >> >>>> regulate the input?
> >> >> >>>
> >> >> >>> Sure. The source could be something like an LTC3803 (geat part) and a
> >> >> >>> standard transformer, one of the DRQ things.
> >> >> >>>
> >> >> >>> We had one inquiry for a HV supply that was pretty time-agile, which
> >> >> >>> would need a linear reg.
> >> >> >>>
> >> >> >>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
> >> >> >>>
> >> >> >>> This stepped C-W was just a goofy idea.
> >> >> >>>
> >> >> >> This topology uses isolation transformers with dual secondaries:
> >> >> >>
> >> >> >> <https://imgur.com/a/XRoYq2V>
> >> >> >>
> >> >> >> I _think_ I got the dots right...
> >> >> >
> >> >> > I think that untangles into a 360 volt transformer and a half-wave
> >> >> > doubler.
> >> >> Ya that sounds right. An old trick in the National Semi handbook from
> >> >> the 70s I think it was, for regulation on the secondary is to wrap an
> >> >> LM317 inside the grid to cathode voltage of a power triode and that
> >> >> works OK for regulating up to a couple kV at low currents without too
> >> >> much thought on how to provide an appropriate reference and error amp
> >> >> for the potentials on that side.
> >> >>
> >> >> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
> >> >> > Lately we don't run line AC into boxes, or use line frequency
> >> >> > transformers. Too many safety and compliance isues, too much weight
> >> >> > and cost.
> >> >> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
> >> >> readily available up to 100 watts or so
> >> >
> >> >much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
> >> Phihomg and MeanWell make warts (big plugs) at 60 watts.
> >
> >lots of 65W USB-C chargers like this: https://www.pricerunner.dk/product/640x640/3002755304/Baseus-GaN2-Lite-Quick-Charge-Travel-Charger.jpg
> Yikes. GaN fets are changing things. I wonder what the switching
> frequency is.
>
> What's the output voltage? Surely not 5.

The 65W is at 20V
the USB-C is "Power Delivery", so it starts at as normal USB 5V/900mA
and then as requested switches to 5,9,12,15 or 20V little over 3A

torsdag den 28. juli 2022 kl. 17.36.08 UTC+2 skrev jla...@highlandsniptechnology.com:
> On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
> <pcdhSpamM...@electrooptical.net> wrote:
>
> >jla...@highlandsniptechnology.com wrote:
> >> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
> >> <lang...@fonz.dk> wrote:
> >>
> >>> torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
> >>>> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
> >>>>> On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
> >>>>>
> >>>>>> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
> >>>>>>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
> >>>>>>> <lang...@fonz.dk> wrote:
> >>>>>>>
> >>>>>>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
> >>>>>>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
> >>>>>>>>> <pcdhSpamM...@electrooptical.net> wrote:
> >>>>>>>>>
> >>>>>>>>>> jla...@highlandsniptechnology.com wrote:
> >>>>>>>>>>>
> >>>>>>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
> >>>>>>>>>>>
> >>>>>>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
> >>>>>>>>>> with N stages. (Does require using the relays for commutation, of course.)
> >>>>>>>>>>
> >>>>>>>>>> Cheers
> >>>>>>>>>>
> >>>>>>>>>> Phil Hobbs
> >>>>>>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
> >>>>>>>>> cheap telecom relays. Maybe an incremental linear reg could
> >>>>>>>>> interpolate between the steps.
> >>>>>>>>
> >>>>>>>> regulate the input?
> >>>>>>>
> >>>>>>> Sure. The source could be something like an LTC3803 (geat part) and a
> >>>>>>> standard transformer, one of the DRQ things.
> >>>>>>>
> >>>>>>> We had one inquiry for a HV supply that was pretty time-agile, which
> >>>>>>> would need a linear reg.
> >>>>>>>
> >>>>>>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
> >>>>>>>
> >>>>>>> This stepped C-W was just a goofy idea.
> >>>>>>>
> >>>>>> This topology uses isolation transformers with dual secondaries:
> >>>>>>
> >>>>>> <https://imgur.com/a/XRoYq2V>
> >>>>>>
> >>>>>> I _think_ I got the dots right...
> >>>>>
> >>>>> I think that untangles into a 360 volt transformer and a half-wave
> >>>>> doubler.
> >>>> Ya that sounds right. An old trick in the National Semi handbook from
> >>>> the 70s I think it was, for regulation on the secondary is to wrap an
> >>>> LM317 inside the grid to cathode voltage of a power triode and that
> >>>> works OK for regulating up to a couple kV at low currents without too
> >>>> much thought on how to provide an appropriate reference and error amp
> >>>> for the potentials on that side.
> >>>>
> >>>> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
> >>>>> Lately we don't run line AC into boxes, or use line frequency
> >>>>> transformers. Too many safety and compliance isues, too much weight
> >>>>> and cost.
> >>>> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
> >>>> readily available up to 100 watts or so
> >>>
> >>> much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
> >>
> >> Phihomg and MeanWell make warts (big plugs) at 60 watts.
> >>
> >
> >All you need is a power bar with the outlets in the right orientation.
> >The one over my bench is a very nice 20x Tripplite one, with filtering
> >and MOVs, but the prongs are oriented horizontally, so that most warts
> >take up two spaces.
> >
> >Cheers
> >
> >Phil Hobbs
> We're shipping rackmount boxes to a big govt facility. They have a
> group in charge of safety and compliance and all that stuff and would
> have set us back 6 months and maybe $40K in lab fees if we ran AC into
> the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
> problem... no complaints from the users.
>
> https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1
>
> It pulls about 2 amps until the giant EOM oven heats up, maybe 15
> minutes.
>
> The power connector on the back is the usual barrel, but it's threaded
> for optional mechanical locking.

the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking

On Thu, 28 Jul 2022 11:08:39 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

>torsdag den 28. juli 2022 kl. 17.38.47 UTC+2 skrev jla...@highlandsniptechnology.com:
>> On Thu, 28 Jul 2022 08:33:17 -0700 (PDT), Lasse Langwadt Christensen
>> <lang...@fonz.dk> wrote:
>>
>> >torsdag den 28. juli 2022 kl. 16.23.22 UTC+2 skrev jla...@highlandsniptechnology.com:
>> >> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
>> >> <lang...@fonz.dk> wrote:
>> >>
>> >> >torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
>> >> >> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
>> >> >> > On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
>> >> >> >
>> >> >> >> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
>> >> >> >>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>> >> >> >>> <lang...@fonz.dk> wrote:
>> >> >> >>>
>> >> >> >>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>> >> >> >>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>> >> >> >>>>> <pcdhSpamM...@electrooptical.net> wrote:
>> >> >> >>>>>
>> >> >> >>>>>> jla...@highlandsniptechnology.com wrote:
>> >> >> >>>>>>>
>> >> >> >>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>> >> >> >>>>>>>
>> >> >> >>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>> >> >> >>>>>> with N stages. (Does require using the relays for commutation, of course.)
>> >> >> >>>>>>
>> >> >> >>>>>> Cheers
>> >> >> >>>>>>
>> >> >> >>>>>> Phil Hobbs
>> >> >> >>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>> >> >> >>>>> cheap telecom relays. Maybe an incremental linear reg could
>> >> >> >>>>> interpolate between the steps.
>> >> >> >>>>
>> >> >> >>>> regulate the input?
>> >> >> >>>
>> >> >> >>> Sure. The source could be something like an LTC3803 (geat part) and a
>> >> >> >>> standard transformer, one of the DRQ things.
>> >> >> >>>
>> >> >> >>> We had one inquiry for a HV supply that was pretty time-agile, which
>> >> >> >>> would need a linear reg.
>> >> >> >>>
>> >> >> >>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>> >> >> >>>
>> >> >> >>> This stepped C-W was just a goofy idea.
>> >> >> >>>
>> >> >> >> This topology uses isolation transformers with dual secondaries:
>> >> >> >>
>> >> >> >> <https://imgur.com/a/XRoYq2V>
>> >> >> >>
>> >> >> >> I _think_ I got the dots right...
>> >> >> >
>> >> >> > I think that untangles into a 360 volt transformer and a half-wave
>> >> >> > doubler.
>> >> >> Ya that sounds right. An old trick in the National Semi handbook from
>> >> >> the 70s I think it was, for regulation on the secondary is to wrap an
>> >> >> LM317 inside the grid to cathode voltage of a power triode and that
>> >> >> works OK for regulating up to a couple kV at low currents without too
>> >> >> much thought on how to provide an appropriate reference and error amp
>> >> >> for the potentials on that side.
>> >> >>
>> >> >> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
>> >> >> > Lately we don't run line AC into boxes, or use line frequency
>> >> >> > transformers. Too many safety and compliance isues, too much weight
>> >> >> > and cost.
>> >> >> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
>> >> >> readily available up to 100 watts or so
>> >> >
>> >> >much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
>> >> Phihomg and MeanWell make warts (big plugs) at 60 watts.
>> >
>> >lots of 65W USB-C chargers like this: https://www.pricerunner.dk/product/640x640/3002755304/Baseus-GaN2-Lite-Quick-Charge-Travel-Charger.jpg
>> Yikes. GaN fets are changing things. I wonder what the switching
>> frequency is.
>>
>> What's the output voltage? Surely not 5.
>
>The 65W is at 20V
>the USB-C is "Power Delivery", so it starts at as normal USB 5V/900mA
>and then as requested switches to 5,9,12,15 or 20V little over 3A
>

I need to look into that. I'm thinking about a product line of little
blue box signal conditioners, aerospace things, and a USB power
connector would be cool. But I think some negotiation has to be done
to get more than the minimum 5 watts. And maybe some older PCs and
laptops can't do more.

There's probably a good book somewhere.

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

> torsdag den 28. juli 2022 kl. 17.38.47 UTC+2 skrev

[...]

>> What's the output voltage? Surely not 5.
>
> The 65W is at 20V
> the USB-C is "Power Delivery", so it starts at as normal USB 5V/900mA
> and then as requested switches to 5,9,12,15 or 20V little over 3A

Amazon sells a 5V 12A USB charger for CDN$26.99:

https://www.amazon.ca/Charger-Rolvse-Charging-Station-
Compatible/dp/B09JWR84QF/

I don't need that much for my desk lamp, so I got a 32W version for
CDN$16.99:

https://www.amazon.ca/gp/product/B09R9RMV79

So they do exist.

However, USB-C cannot take the current:

https://m.media-amazon.com/images/I/61i8joCjpiL._CR0,204,1224,1224
_UX175.jpg

--
MRM

torsdag den 28. juli 2022 kl. 20.23.24 UTC+2 skrev John Larkin:
> On Thu, 28 Jul 2022 11:08:39 -0700 (PDT), Lasse Langwadt Christensen
> <lang...@fonz.dk> wrote:
>
> >torsdag den 28. juli 2022 kl. 17.38.47 UTC+2 skrev jla...@highlandsniptechnology.com:
> >> On Thu, 28 Jul 2022 08:33:17 -0700 (PDT), Lasse Langwadt Christensen
> >> <lang...@fonz.dk> wrote:
> >>
> >> >torsdag den 28. juli 2022 kl. 16.23.22 UTC+2 skrev jla...@highlandsniptechnology.com:
> >> >> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
> >> >> <lang...@fonz.dk> wrote:
> >> >>
> >> >> >torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
> >> >> >> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
> >> >> >> > On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
> >> >> >> >
> >> >> >> >> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
> >> >> >> >>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
> >> >> >> >>> <lang...@fonz.dk> wrote:
> >> >> >> >>>
> >> >> >> >>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
> >> >> >> >>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
> >> >> >> >>>>> <pcdhSpamM...@electrooptical.net> wrote:
> >> >> >> >>>>>
> >> >> >> >>>>>> jla...@highlandsniptechnology.com wrote:
> >> >> >> >>>>>>>
> >> >> >> >>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
> >> >> >> >>>>>>>
> >> >> >> >>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
> >> >> >> >>>>>> with N stages. (Does require using the relays for commutation, of course.)
> >> >> >> >>>>>>
> >> >> >> >>>>>> Cheers
> >> >> >> >>>>>>
> >> >> >> >>>>>> Phil Hobbs
> >> >> >> >>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
> >> >> >> >>>>> cheap telecom relays. Maybe an incremental linear reg could
> >> >> >> >>>>> interpolate between the steps.
> >> >> >> >>>>
> >> >> >> >>>> regulate the input?
> >> >> >> >>>
> >> >> >> >>> Sure. The source could be something like an LTC3803 (geat part) and a
> >> >> >> >>> standard transformer, one of the DRQ things.
> >> >> >> >>>
> >> >> >> >>> We had one inquiry for a HV supply that was pretty time-agile, which
> >> >> >> >>> would need a linear reg.
> >> >> >> >>>
> >> >> >> >>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
> >> >> >> >>>
> >> >> >> >>> This stepped C-W was just a goofy idea.
> >> >> >> >>>
> >> >> >> >> This topology uses isolation transformers with dual secondaries:
> >> >> >> >>
> >> >> >> >> <https://imgur.com/a/XRoYq2V>
> >> >> >> >>
> >> >> >> >> I _think_ I got the dots right...
> >> >> >> >
> >> >> >> > I think that untangles into a 360 volt transformer and a half-wave
> >> >> >> > doubler.
> >> >> >> Ya that sounds right. An old trick in the National Semi handbook from
> >> >> >> the 70s I think it was, for regulation on the secondary is to wrap an
> >> >> >> LM317 inside the grid to cathode voltage of a power triode and that
> >> >> >> works OK for regulating up to a couple kV at low currents without too
> >> >> >> much thought on how to provide an appropriate reference and error amp
> >> >> >> for the potentials on that side.
> >> >> >>
> >> >> >> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
> >> >> >> > Lately we don't run line AC into boxes, or use line frequency
> >> >> >> > transformers. Too many safety and compliance isues, too much weight
> >> >> >> > and cost.
> >> >> >> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
> >> >> >> readily available up to 100 watts or so
> >> >> >
> >> >> >much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
> >> >> Phihomg and MeanWell make warts (big plugs) at 60 watts.
> >> >
> >> >lots of 65W USB-C chargers like this: https://www.pricerunner.dk/product/640x640/3002755304/Baseus-GaN2-Lite-Quick-Charge-Travel-Charger.jpg
> >> Yikes. GaN fets are changing things. I wonder what the switching
> >> frequency is.
> >>
> >> What's the output voltage? Surely not 5.
> >
> >The 65W is at 20V
> >the USB-C is "Power Delivery", so it starts at as normal USB 5V/900mA
> >and then as requested switches to 5,9,12,15 or 20V little over 3A
> >
> I need to look into that. I'm thinking about a product line of little
> blue box signal conditioners, aerospace things, and a USB power
> connector would be cool. But I think some negotiation has to be done
> to get more than the minimum 5 watts. And maybe some older PCs and
> laptops can't do more.
yes you need a pile of software* or a dedicated chip like these: https://www.amazon.com/Type-C-Trigger-Module-Supports-Output/dp/B08LDJBN8P/

it of course ties up the USB, but that doesn't really matter because so far I haven't seen any PCs or laptops
that supports more that the normal 5V output, only seen chargers and powerbanks that does that

On Thu, 28 Jul 2022 11:46:01 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>jlarkin@highlandsniptechnology.com wrote:
>> On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>> jlarkin@highlandsniptechnology.com wrote:
>>>> On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
>>>> <langwadt@fonz.dk> wrote:
>>>>
>>>>> torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
>>>>>> On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
>>>>>>> On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:
>>>>>>>
>>>>>>>> On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
>>>>>>>>> On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
>>>>>>>>> <lang...@fonz.dk> wrote:
>>>>>>>>>
>>>>>>>>>> tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
>>>>>>>>>>> On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
>>>>>>>>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> jla...@highlandsniptechnology.com wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>> https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1
>>>>>>>>>>>>>
>>>>>>>>>>>> Fun. Of course with the right parts, you can do 2**N multiplication
>>>>>>>>>>>> with N stages. (Does require using the relays for commutation, of course.)
>>>>>>>>>>>>
>>>>>>>>>>>> Cheers
>>>>>>>>>>>>
>>>>>>>>>>>> Phil Hobbs
>>>>>>>>>>> This circuit can do a 2^N step high-voltage supply with N low voltage,
>>>>>>>>>>> cheap telecom relays. Maybe an incremental linear reg could
>>>>>>>>>>> interpolate between the steps.
>>>>>>>>>>
>>>>>>>>>> regulate the input?
>>>>>>>>>
>>>>>>>>> Sure. The source could be something like an LTC3803 (geat part) and a
>>>>>>>>> standard transformer, one of the DRQ things.
>>>>>>>>>
>>>>>>>>> We had one inquiry for a HV supply that was pretty time-agile, which
>>>>>>>>> would need a linear reg.
>>>>>>>>>
>>>>>>>>> Frankly, I'd rather not be in the HV business. Too much to go wrong.
>>>>>>>>>
>>>>>>>>> This stepped C-W was just a goofy idea.
>>>>>>>>>
>>>>>>>> This topology uses isolation transformers with dual secondaries:
>>>>>>>>
>>>>>>>> <https://imgur.com/a/XRoYq2V>
>>>>>>>>
>>>>>>>> I _think_ I got the dots right...
>>>>>>>
>>>>>>> I think that untangles into a 360 volt transformer and a half-wave
>>>>>>> doubler.
>>>>>> Ya that sounds right. An old trick in the National Semi handbook from
>>>>>> the 70s I think it was, for regulation on the secondary is to wrap an
>>>>>> LM317 inside the grid to cathode voltage of a power triode and that
>>>>>> works OK for regulating up to a couple kV at low currents without too
>>>>>> much thought on how to provide an appropriate reference and error amp
>>>>>> for the potentials on that side.
>>>>>>
>>>>>> Long lead times on many N fets with Vds > 1kV, not surprising I guess.
>>>>>>> Lately we don't run line AC into boxes, or use line frequency
>>>>>>> transformers. Too many safety and compliance isues, too much weight
>>>>>>> and cost.
>>>>>> Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
>>>>>> readily available up to 100 watts or so
>>>>>
>>>>> much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
>>>>
>>>> Phihomg and MeanWell make warts (big plugs) at 60 watts.
>>>>
>>>
>>> All you need is a power bar with the outlets in the right orientation.
>>> The one over my bench is a very nice 20x Tripplite one, with filtering
>>> and MOVs, but the prongs are oriented horizontally, so that most warts
>>> take up two spaces.
>>>
>>> Cheers
>>>
>>> Phil Hobbs
>>
>> We're shipping rackmount boxes to a big govt facility. They have a
>> group in charge of safety and compliance and all that stuff and would
>> have set us back 6 months and maybe $40K in lab fees if we ran AC into
>> the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
>> problem... no complaints from the users.
>
>Yeah, we use warts too. Our standard one is an SL Power ME10A2403B01,
>which comes with international plug adapters. It's overkill for most of
>our stuff, except for some of the beefier TE coolers.
>
>>
>> https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1
>
>Very pretty.

Ugly. They insisted on black anodize. Highland Blue would have been
much better.

The LCD is an eval board. We couldn't get the lcd or the driver chips,
but lots of eval boards are available.