another pcb in progress...

[John Larkin]

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.

 

[Michael Terrell]

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

 

[John Larkin]

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.

 

[Jan Panteltje]

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...

 

[Jan Panteltje]

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.

 

[Jan Panteltje]

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...

 

[John Larkin]

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.

 

[John S]

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.