Making an old man programmer
Since the dawn of the "Pesky Padauk Programmer Project"™ (part one and part two) I have been wanting to make a version that suits my old man eyes, plus I thought it might be an opportunity to learn a bit about how this circuit (and hence how the Padauk chips) function.
I grabbed the relevant files and then tweaked the PCB to be outrageously large by comparison to the original. As always, there are mistakes - the holes for the 1N5817 diodes are too small, and the holes for the through-hole capacitors are too close together.
But the programmer loads the firmware when finished - and the next step is to make sure that it can program a Padauk chip, particularly the PFS154.
If you would like to have a tweak or two - here are the gerber files - at this stage (edit: now Aug 2022, this version DOES NOT WORK as is).
Thank you to PCBWAY for their sponsorship, support and advice. Here is the result:
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