https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=be0lqsi0wg6103clzvckgbywa&raw=1

This will be a 3-phase power supply, specifically a permanent-magnet
alternator simulator.

The PCB and schematic are both revision A8. We ratchet up revisions of
the schematic and PCB in sync during development; it will ultimately
be released to the company library and to production as rev A.

I think we've gone beyond A20 a couple of times.

I was shocked at how much whitespace there is on the board. I should
add some parts.

I just finished assigning signals to FPGA pins, trying to minimize
crossovers, which is a huge nuisance.

There are some fast logic levels that are about 13" long and cross two
reference planes and a minefield of nasty switching stuff, as much as
120 v p-p.

On Saturday, July 22, 2023 at 3:56:11 PM UTC-4, John Larkin wrote:
> https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=be0lqsi0wg6103clzvckgbywa&raw=1
>
> This will be a 3-phase power supply, specifically a permanent-magnet
> alternator simulator.
>
> The PCB and schematic are both revision A8. We ratchet up revisions of
> the schematic and PCB in sync during development; it will ultimately
> be released to the company library and to production as rev A.
>
> I think we've gone beyond A20 a couple of times.
>
> I was shocked at how much whitespace there is on the board. I should
> add some parts.
>
> I just finished assigning signals to FPGA pins, trying to minimize
> crossovers, which is a huge nuisance.
>
> There are some fast logic levels that are about 13" long and cross two
> reference planes and a minefield of nasty switching stuff, as much as
> 120 v p-p.

I can't make out much of the board with my current vision problems, but I know that it'll work well when it hits Rev A

On Sat, 22 Jul 2023 14:46:19 -0700 (PDT), Michael Terrell
<terrell.michael.a@gmail.com> wrote:

>On Saturday, July 22, 2023 at 3:56:11?PM UTC-4, John Larkin wrote:
>> https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=be0lqsi0wg6103clzvckgbywa&raw=1
>>
>> This will be a 3-phase power supply, specifically a permanent-magnet
>> alternator simulator.
>>
>> The PCB and schematic are both revision A8. We ratchet up revisions of
>> the schematic and PCB in sync during development; it will ultimately
>> be released to the company library and to production as rev A.
>>
>> I think we've gone beyond A20 a couple of times.
>>
>> I was shocked at how much whitespace there is on the board. I should
>> add some parts.
>>
>> I just finished assigning signals to FPGA pins, trying to minimize
>> crossovers, which is a huge nuisance.
>>
>> There are some fast logic levels that are about 13" long and cross two
>> reference planes and a minefield of nasty switching stuff, as much as
>> 120 v p-p.
>
>I can't make out much of the board with my current vision problems, but I know that it'll work well when it hits Rev A

The pic is a screen shot and isn't high resolution. I've had four eye
surgeries in the last few years and can sympathize. [1]

I hope this board will work well. If it doesn't it will probably blow
up. We'll have two or three serious design reviews and I've simulated
it a lot.

It's nice when you can sell rev A, the first one, with maybe a parts
value change or a blue wire or two.

People here want to use blue wires, but I prefer red, the Scarlet
Letter thing.

[1] Seems to me that The New York Times has fattened their fonts
recently. Since mostly older people buy newspapers, they sure should.

On a sunny day (Sat, 22 Jul 2023 12:55:53 -0700) it happened John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote in
<42cobipa2b25cvdait4pb91dpoqpitc6e3@4ax.com>:

>
>https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=be0lqsi0wg6103clzvckgbywa&raw=1
>
>This will be a 3-phase power supply, specifically a permanent-magnet
>alternator simulator.
>
>The PCB and schematic are both revision A8. We ratchet up revisions of
>the schematic and PCB in sync during development; it will ultimately
>be released to the company library and to production as rev A.
>
>I think we've gone beyond A20 a couple of times.
>
>I was shocked at how much whitespace there is on the board. I should
>add some parts.
>
>I just finished assigning signals to FPGA pins, trying to minimize
>crossovers, which is a huge nuisance.
>
>There are some fast logic levels that are about 13" long and cross two
>reference planes and a minefield of nasty switching stuff, as much as
>120 v p-p.
>

Use wires?
Ment as a joke, but still...

On a sunny day (Sat, 22 Jul 2023 14:46:19 -0700 (PDT)) it happened Michael
Terrell <terrell.michael.a@gmail.com> wrote in
<ed22b7a1-7daf-4440-8b29-c41ceff39bd3n@googlegroups.com>:

>On Saturday, July 22, 2023 at 3:56:11 PM UTC-4, John Larkin wrote:
>> https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=b=
>e0lqsi0wg6103clzvckgbywa&raw=1
>>
>> This will be a 3-phase power supply, specifically a permanent-magnet
>> alternator simulator.
>>
>> The PCB and schematic are both revision A8. We ratchet up revisions of
>> the schematic and PCB in sync during development; it will ultimately
>> be released to the company library and to production as rev A.
>>
>> I think we've gone beyond A20 a couple of times.
>>
>> I was shocked at how much whitespace there is on the board. I should
>> add some parts.
>>
>> I just finished assigning signals to FPGA pins, trying to minimize
>> crossovers, which is a huge nuisance.
>>
>> There are some fast logic levels that are about 13" long and cross two
>> reference planes and a minefield of nasty switching stuff, as much as
>> 120 v p-p.
>
>I can't make out much of the board with my current vision problems, but I =
>know that it'll work well when it hits Rev A

The yellow on a light background is a bad choice,
Nobody can read that.

On a sunny day (Sat, 22 Jul 2023 15:00:11 -0700) it happened John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote in
<qsjobil0v3h3ao8vq8rnreuqdkes45c25i@4ax.com>:

>On Sat, 22 Jul 2023 14:46:19 -0700 (PDT), Michael Terrell
><terrell.michael.a@gmail.com> wrote:
>
>>On Saturday, July 22, 2023 at 3:56:11?PM UTC-4, John Larkin wrote:
>>> https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=be0lqsi0wg6103clzvckgbywa&raw=1
>>>
>>> This will be a 3-phase power supply, specifically a permanent-magnet
>>> alternator simulator.
>>>
>>> The PCB and schematic are both revision A8. We ratchet up revisions of
>>> the schematic and PCB in sync during development; it will ultimately
>>> be released to the company library and to production as rev A.
>>>
>>> I think we've gone beyond A20 a couple of times.
>>>
>>> I was shocked at how much whitespace there is on the board. I should
>>> add some parts.
>>>
>>> I just finished assigning signals to FPGA pins, trying to minimize
>>> crossovers, which is a huge nuisance.
>>>
>>> There are some fast logic levels that are about 13" long and cross two
>>> reference planes and a minefield of nasty switching stuff, as much as
>>> 120 v p-p.
>>
>>I can't make out much of the board with my current vision problems, but I know that it'll work well when it hits Rev A
>
>The pic is a screen shot and isn't high resolution. I've had four eye
>surgeries in the last few years and can sympathize. [1]
>
>I hope this board will work well. If it doesn't it will probably blow
>up. We'll have two or three serious design reviews and I've simulated
>it a lot.
>
>It's nice when you can sell rev A, the first one, with maybe a parts
>value change or a blue wire or two.
>
>People here want to use blue wires, but I prefer red, the Scarlet
>Letter thing.
>
>[1] Seems to me that The New York Times has fattened their fonts
>recently. Since mostly older people buy newspapers, they sure should.

I was reading microsoft hss moved to a new font recently...

On Sun, 23 Jul 2023 05:42:22 GMT, Jan Panteltje <alien@comet.invalid>
wrote:

>On a sunny day (Sat, 22 Jul 2023 12:55:53 -0700) it happened John Larkin
><jlarkin@highlandSNIPMEtechnology.com> wrote in
><42cobipa2b25cvdait4pb91dpoqpitc6e3@4ax.com>:
>
>>
>>https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=be0lqsi0wg6103clzvckgbywa&raw=1
>>
>>This will be a 3-phase power supply, specifically a permanent-magnet
>>alternator simulator.
>>
>>The PCB and schematic are both revision A8. We ratchet up revisions of
>>the schematic and PCB in sync during development; it will ultimately
>>be released to the company library and to production as rev A.
>>
>>I think we've gone beyond A20 a couple of times.
>>
>>I was shocked at how much whitespace there is on the board. I should
>>add some parts.
>>
>>I just finished assigning signals to FPGA pins, trying to minimize
>>crossovers, which is a huge nuisance.
>>
>>There are some fast logic levels that are about 13" long and cross two
>>reference planes and a minefield of nasty switching stuff, as much as
>>120 v p-p.
>>
>
>Use wires?
>Ment as a joke, but still...

The longest logic runs are from the FPGA on the left to six isolated
delta-sigma ADCs on the far right. They measure the output voltage and
current of each of the three phases.

I'll run the clock high-level differential to a receiver-buffer near
the ADCs, which should be reliable. The six data lines coming back are
still single-ended, but an occasional data spike in a delta-sigma data
stream wouldn't be fatal.

On 7/22/2023 2:55 PM, John Larkin wrote:
>
> https://www.dropbox.com/scl/fi/k1k7ms7ygg6tcoe3z9s21/P942A8.jpg?rlkey=be0lqsi0wg6103clzvckgbywa&raw=1
>
> This will be a 3-phase power supply, specifically a permanent-magnet
> alternator simulator.

Looks like a puzzle right now.

> The PCB and schematic are both revision A8. We ratchet up revisions of
> the schematic and PCB in sync during development; it will ultimately
> be released to the company library and to production as rev A.
>
> I think we've gone beyond A20 a couple of times.

No doubt.

>
> I was shocked at how much whitespace there is on the board. I should
> add some parts.

Yes, that will improve customers' perception as to your design abilities.

> I just finished assigning signals to FPGA pins, trying to minimize
> crossovers, which is a huge nuisance.
>

Yes, but you did it!! Yayy!

> There are some fast logic levels that are about 13" long and cross two
> reference planes and a minefield of nasty switching stuff, as much as
> 120 v p-p.
>

But you can handle it, cowboy.