Question: PSN-ADC-USB Board and BOM

[John L. Males]

Larry,

As best as I understand there is no gerber files for the
PSN-ADC-USB Board. Is there a schematic for the USB version? If so
can it be added to:

<https://github.com/lcochrane24/PSN-ADC-SERIAL>


John L. Males
Toronto, Ontario
Canada

2026-01-16 16:12+0000 UTC eMail Start
2026-01-16 16:34+0000 UTC
2026-01-16 11:34-0500 EST

*****Not GPG/PG Signed*****

[Larry Cochrane]

John,

I placed the files I have for the USB version here: https://www.seismicnet.com/software/DspSdrUsb.zip

This file contains the Gerber files for both the DB25 and 26 pin ribbon connector version of the board. The only
schematic I have is the USB interface part of the board. I can't run the program I used may years ago to generate pdf
files from the .sch files so this is all I have. The only difference between between the RS-232 version and the USB
version is the RS-232 parts have been replaced with a FTDI FT232RL UART to USB converter chip.

Regards,
Larry Cochrane
Redwood PSN

[John L. Males]

Larry,

Thank you very much for the DspSdrUsb.zip file.

I only expected what you may have already.

Is the primary difference of PSN ADC Serial and 24 bit board
(ignoring the obvious PDIP/SMD LTC1605 foot print difference for PSN
ADC Serial) the board routing or part type/value? In other words the
same schematic with maybe different value for few parts. I ask in
event I decide to create KiCAD schematics of these boards.

For PSN ADC Serial board V3.1 and greater is the same hex
file/source used for all boards?

When you had your PCBs made where did you have the PCBs made?

John L. Males
Toronto, Ontario
Canada

2026-01-24 17:37+0000 UTC eMail Start
2026-01-24 17:53+0000 UTC
2026-01-24 12:53-0500 EST

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On Date: Tue, 20 Jan 2026 17:39:46 -0800
From: Larry Cochrane <lcoc...@sonic.net>
To: psn...@googlegroups.com
Subject: Re: [PsnList] Question: PSN-ADC-USB Board and BOM

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[Larry Cochrane]

John,

> Is the primary difference of PSN ADC Serial and 24 bit board
> (ignoring the obvious PDIP/SMD LTC1605 foot print difference for PSN
> ADC Serial) the board routing or part type/value? In other words the
> same schematic with maybe different value for few parts. I ask in
> event I decide to create KiCAD schematics of these boards.

No, there are a few differences between the two boars. I would say the only commonality is the DspPIC microcontroller
and some interface parts.

>
> For PSN ADC Serial board V3.1 and greater is the same hex
> file/source used for all boards?

No, there are two different hex files used for the serial and USB versions of the 16Bit board. I updated DspSdrUsb.zip
with the USB version of the hex file.

>
> When you had your PCBs made where did you have the PCBs made?

I used PCBWay.com or JLCPCB.com.

-Larry

[John L. Males]

Larry,

Before you read farther, this is a if/when you have time and if/when
you have frame of mind to what follows.

Thanks for the updated DspSdrUsb.zip for the 16 bit USB and Serial
board versions.

Is the source the same for the 4.x ignoring the obvious define for
USB on github for the 4.x 16 bit Serial Board PCB versions?

I know in prior reply you indicated you no longer have the software
for the 16 bit board versions in DspSdrUsb.zip to generate PDFs of
schematics from .sch files. If you have the .sch files would you be
willing to provide for the versions of 16 bit boards in
DspSdrUsb.zip? I may be able to find way to import and/or view
those .sch file schematics online if I know the software that was
used to create the .sch files. Then I can use those .sch files
I can view at least as basis to create KiCAD versions of those .sch
files.

The existing PDF schematics for 16 bit and 24 bit ADC boards are
just fine for me to create KiCAD schematics. For the alternate PCB
versions in DspSdrUsb.zip and if lucky if you have the .sch files
for the PCB board versions in DspSdrUsb.zip it will then be easy to
create the KiCAD versions using the PDF schematic files for 16 bit
board on github. Otherwise I need to determine if I can manually
create schematics with eCAD (KiCAD) from the gerber files
(error prone process by all accounts via research) for the 16 bit
boards in DspSdrUsb.zip. A small advantage in the manual convert
gerber files to schematic is having the PDF schematics of 16 bit
board V3.1 on github.

I like to create KiCAD versions of schematics then KiCAD PCBs of
respective PSN board 16 and 24 bit boards. Once I have, then I
will look into working on alternative ADC and related code for 24
bit board. The CS5532 is EOL for several months due to fab closing
causing many Cirrus Logic ICs EOL as result. I think the PSN
board design has very good future. Therefore to have a 24 bit board
using different ADC makes sense. There are some excellent 24 bit
ADC choices to the EOL CS5532 in my opinion.

The 16 bit board has some very endearing qualities related to the
LTC1605 that in my opinion still make the 16 bit board attractive.

John L. Males
Toronto, Ontario
Canada

2026-01-28 02:11+0000 UTC eMail Start
2026-01-28 02:59+0000 UTC
2026-01-27 21:59-0500 EST

*****Not GPG/PG Signed*****



On Date: Sun, 25 Jan 2026 13:48:33 -0800

From: Larry Cochrane <lcoc...@sonic.net>
To: psn...@googlegroups.com
Subject: Re: [PsnList] Question: PSN-ADC-USB Board and BOM

> --
> You received this message because you are subscribed to the
> Google Groups "Public Seismic Network Mailing List" group. To
> unsubscribe from this group and stop receiving emails from it,
> send an email to psnlist+u...@googlegroups.com. To view
> this discussion visit

> https://groups.google.com/d/msgid/psnlist/e46b9ee6-9c5f-4d49-9057-1bad42634060%40sonic.net.