oracle_jedi Posted August 18, 2022 Share Posted August 18, 2022 I recently picked up at Aquarius. I have a soft spot for hopeless little 8-bit micros with unusable keyboards. It joins a CGL M5 and a Commodore MAX in my collection. Anyway I have the parts to do the composite video mod. But I've also noted that the power supply buzzes quite loudly. The output voltages are unique, but looking at the schematic I see that they are regulated to +5V, +12V and -12V. So.... Can the PSU be replaced with one from, say, an Atari ST. Has anyone done this? By-pass the voltage regulation on the motherboard and deliver the three final voltages. And do I even need the -12V if I don't ever plan to use the printer? Quote Link to comment Share on other sites More sharing options...
jltursan Posted August 18, 2022 Share Posted August 18, 2022 (edited) I'm not an expert but looking the schematics seems that isolating the two red spots I've drawn and injecting the right DC voltage there you can make the machine run happily (well, without -12 of course): No idea if there's a way to avoid cutting traces or being more elegant... Edited August 18, 2022 by jltursan 1 Quote Link to comment Share on other sites More sharing options...
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