On Thu, 28 Jul 2022 11:15:27 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

>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

XLRs are great. I never understood why a microphone connector has,
like, 10 amp pins. What SPL makes 10 amps?

On 29/7/22 12:21, jlarkin@highlandsniptechnology.com wrote:
> On Thu, 28 Jul 2022 11:15:27 -0700 (PDT), Lasse Langwadt Christensen
> <langwadt@fonz.dk> wrote:
>
>> 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
>
> XLRs are great. I never understood why a microphone connector has,
> like, 10 amp pins. What SPL makes 10 amps?

In the case of stage gear, it's not the amps, it's the newtons that
matter. Specifically of a drunk rock-star tripping over a cable without
interrupting whatever horrendous din they're making at the time.

On Fri, 29 Jul 2022 12:41:03 +1000, Clifford Heath
<no_spam@please.net> wrote:

>On 29/7/22 12:21, jlarkin@highlandsniptechnology.com wrote:
>> On Thu, 28 Jul 2022 11:15:27 -0700 (PDT), Lasse Langwadt Christensen
>> <langwadt@fonz.dk> wrote:
>>
>>> 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
>>
>> XLRs are great. I never understood why a microphone connector has,
>> like, 10 amp pins. What SPL makes 10 amps?
>
>In the case of stage gear, it's not the amps, it's the newtons that
>matter. Specifically of a drunk rock-star tripping over a cable without
>interrupting whatever horrendous din they're making at the time.

I think they are beer-proof too.

jlarkin@highlandsniptechnology.com wrote:
> 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.
>
We're going in the DKNY direction ourselves--machined brass and black
powder-coated steel.

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

Am 29.07.22 um 14:09 schrieb Phil Hobbs:

> We're going in the DKNY direction ourselves--machined brass and black
> powder-coated steel.

Coating with black powder?

> Cheers
>

Gerhard
>

Gerhard Hoffmann wrote:
> Am 29.07.22 um 14:09 schrieb Phil Hobbs:
>
>> We're going in the DKNY direction ourselves--machined brass and black
>> powder-coated steel.
>
> Coating with black powder?
>
>> Cheers
>>
>
>   Gerhard
>>
>
Note the hyphen. ;)

However, we do thing they're the bomb.

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

fredag den 29. juli 2022 kl. 04.21.36 UTC+2 skrev jla...@highlandsniptechnology.com:
> On Thu, 28 Jul 2022 11:15:27 -0700 (PDT), Lasse Langwadt Christensen
> <lang...@fonz.dk> wrote:
>
> >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
> XLRs are great.

ye as long as it is the Neutrik style, easy to assemble excellent strain relief,
nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws

> I never understood why a microphone connector has,
> like, 10 amp pins. What SPL makes 10 amps?

it needs to be musician and roadie proof. It has also been used for connecting spekers

Now replaced with Speakon with is up to 8 pins, 40A rated, and the pins are inside where you can't touch them

On Fri, 29 Jul 2022 08:09:54 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>jlarkin@highlandsniptechnology.com wrote:
>> 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.
>>
>We're going in the DKNY direction ourselves--machined brass and black
>powder-coated steel.
>
>Cheers
>
>Phil Hobbs

Here's the first unit of a new product. The front panel is powder
coated on the front and all edges, but still conductive bare aluminum
on its back side.

Protocase made us 10 of these in something like 5 days. They do
beautiful work.

https://www.dropbox.com/sh/d908mumrhoglz1v/AACGXlgZ2edfG0rLsxbdMPWMa?dl=0

lang...@fonz.dk wrote:
====================
>
> > >the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
> > XLRs are great.
>
> ye as long as it is the Neutrik style, easy to assemble excellent strain relief,

** Neutrik "XLRs" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.

> nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws

** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
It was specially designed for use with microphones with a smooth, streamlined shape.

https://www.switchcraft.com/a-series-3-pin-xlr-female-cable-mount-silver-pins-nickel/a3f/

While Neutrik Speakons are fine, the many clones are not and fail to connect after a short period of use.
The similar "PowerCons" are flat out dangerous.

...... Phil

lørdag den 30. juli 2022 kl. 02.21.36 UTC+2 skrev palli...@gmail.com:
> lang...@fonz.dk wrote:
> ===================> >
> > > >the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
> > > XLRs are great.
> >
> > ye as long as it is the Neutrik style, easy to assemble excellent strain relief,
> ** Neutrik "XLRs" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.

I prefer the Neutrik and I haven't seen anyone use the Cannon style for 30 years

> > nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws
> ** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
> It was specially designed for use with microphones with a smooth, streamlined shape.

I'm taking about this nonsense https://en.wikipedia.org/wiki/XLR_connector#/media/File:Xlr-connectors.jpg

lang...@fonz.dk wrote:
====================
>
> >
> > > > >the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
> > > > XLRs are great.
> > >
> > > ye as long as it is the Neutrik style, easy to assemble excellent strain relief,
>
> > ** Neutrik "XLRs" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.
>
> I prefer the Neutrik and I haven't seen anyone use the Cannon style for 30 years

** Good for YOU - BTW, it proves nothing.


> > > nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws
>
> > ** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
>
> > It was specially designed for use with microphones with a smooth, streamlined shape.
>
> I'm taking about this nonsense https://en.wikipedia.org/wiki/XLR_connector#/media/File:Xlr-connectors.jpg
>

** Hate to be the one to tell ya this - but the are not made by "Cannon".
Merely cheap XLR style clones made in Asia.

FYI:

Originals had slot headed screws on the saddle and the name Cannon embossed on ( black or grey) inserts.
Not only outlast the mics they were bought for, but often enough the the owners too.

...... Phil

lørdag den 30. juli 2022 kl. 11.42.20 UTC+2 skrev palli...@gmail.com:
> lang...@fonz.dk wrote:
> ====================
> >
> > >
> > > > > >the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
> > > > > XLRs are great.
> > > >
> > > > ye as long as it is the Neutrik style, easy to assemble excellent strain relief,
> >
> > > ** Neutrik "XLRs" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.
> >
> > I prefer the Neutrik and I haven't seen anyone use the Cannon style for 30 years
> ** Good for YOU - BTW, it proves nothing.
> > > > nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws
> >
> > > ** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
> >
> > > It was specially designed for use with microphones with a smooth, streamlined shape.
> >
> > I'm taking about this nonsense https://en.wikipedia.org/wiki/XLR_connector#/media/File:Xlr-connectors.jpg
> >
> ** Hate to be the one to tell ya this - but the are not made by "Cannon".
> Merely cheap XLR style clones made in Asia.

https://www.farnell.com/datasheets/723541.pdf

On Fri, 29 Jul 2022 17:21:33 -0700 (PDT), Phil Allison
<pallison49@gmail.com> wrote:

> lang...@fonz.dk wrote:
>====================
> >
>> > >the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
>> > XLRs are great.
>>
>> ye as long as it is the Neutrik style, easy to assemble excellent strain relief,
>
>** Neutrik "XLRs" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.
>
>> nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws
>
>** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
> It was specially designed for use with microphones with a smooth, streamlined shape.
>
>https://www.switchcraft.com/a-series-3-pin-xlr-female-cable-mount-silver-pins-nickel/a3f/

In the late 1960s to early 1970s, I was a sound man and electrician in
various stage productions. All the XLRs I ever saw (and installed)
were made by Switchcraft, and these were just bulletproof.

They were what one used for low-impedance microphone cables.

I've at least looked at the Neutrik XLRs, but I've never used or
installed them.

>While Neutrik Speakons are fine, the many clones are not and fail to connect after a short period of use.
>The similar "PowerCons" are flat out dangerous.

Dangerous in what sense? (I have no personal experience here.).

Joe Gwinn

Joe Gwinn wrote:
==============
>>
> >** Neutrik "XLRs" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.
> >
> >> nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws
> >
> >** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
> > It was specially designed for use with microphones with a smooth, streamlined shape.
> >
> >https://www.switchcraft.com/a-series-3-pin-xlr-female-cable-mount-silver-pins-nickel/a3f/
>
>
> In the late 1960s to early 1970s, I was a sound man and electrician in
> various stage productions. All the XLRs I ever saw (and installed)
> were made by Switchcraft, and these were just bulletproof.
>

** All the ones I saw back then were " Cannon " made here in Australia.
3 pin EXP and XLR types, plus a few LNEs for AC power.
Switchcraft were a rare sight or came packed with Shure SM xx mics.

>>While Neutrik Speakons are fine, the many clones are not and fail to connect after a short period of use.
> >The similar "PowerCons" are flat out dangerous.
>
> Dangerous in what sense? (I have no personal experience here.).
>

** They are NOT safety approved for use outside of a professional installation situation.
Three reasons exist:

1. Not safe for disconnection while under load - may arc and burn.
2. Will come apart when twisted anti-clockwise exposing live parts.
3. So similar to a Speakon connector folk try to use them with one, forcing it in making a lethal connection.

Should not be supplied to the public, but are seen on items that are sold to anyone - ie compact self powered speakers.

....... Phil

Phil Allison wrote:
=================

** Ooops.
> >
> ** All the ones I saw back then were " Cannon " made here in Australia.
> 3 pin XLP and XLR types, plus a few LNEs for AC power.

FYI XLRs differ by having resilient fittings on the plug to eliminate lateral movement when connected to a mic.

XLPs could move about somewhat and made clicking noises in the mic.

...... Phil