So we now turn our attention back to the Arturia MicroFreak that I had picked up on a whim. After a bit more investigation I was able to determine a few things.
First off, thanks to the thermal camera I picked up, I was able to narrow down the failure of the 6v +/- supply to the regulator itself, and not any of the chips it powers.
Secondly, I was able to figure out that it's actually just a 6v supply, not a 6-7v supply. I misinterpreted a page on the datasheet regarding how the positive and negative voltages are calculated across the sense resistor bridge.
Thirdly, I discovered that the supply actually only powers three chips in the VCO and VCF circuits, not the audio output. The latter is actually driven by a 1.8v linear regulator, which is apparently sufficient to drive low-impedance headphones. Go figure.
Anyway, the full repair is documented here:
And I'm glad to report that the fix worked great. The synth has actually been performing solidly for a few weeks now and shows no signs of failing again, though who knows how long that'll last. Hopefully forever.
Also the rose bush is in full bloom
Which is nice.
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