What is Reddit's opinion of MEAN WELL RS-35-12 AC to DC Power Supply Single Output, 12V 3 Amp 36W?

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Nice work, good insights. I haven’t heard of coil whine on the UDMP, is it really bad for you? Depending on the voltage output and power consumption (and the fact you don’t care about your warranty) it would be pretty easy to swap, say like, a Mean Well power supply in there. Something high quality. Secure it down with double sided 3M tape or a single screw into an existing screw hole.

If you have a cheap multimeter and wire strippers, armed with the output voltage of the black and blue wires coming off the PSU and the max power consumption of the UDMP listed on UI’s website (it’s 33W), you could find a pretty decent replacement PSU that should solve your whine.

FYI not recommending you purchase the linked one, because I’m assuming the stock PSU output is 12V but this should be verified.

The cheap but kind of complicated DIY setup I like is using a pair of Meanwell RS-35-12's wired together in a bipolar configuration.

AI Synthesis makes bus boards with a 5v regulator so you don't need a separate +5v source, and alternatively Michigan Synth Works also makes a +5v device that just plugs into a free power socket.

https://www.amazon.com/MEAN-WELL-RS-35-12-Supply-Single/dp/B00DEDASUC

I've also used the RT65b and RT125b. I don't really like those because the -12v supply is really weak, some versions have minimum load requirements that require huge power resistors for load just to run stable, and the +/-12v outputs aren't adjustable and tend to deviate quite a bit from 12 volts. The dual RS-35-12 setup doesn't have any of those problems. It's probably overpowered for the setup you're designing, but that's okay. You could use RS-25-12s instead. (They're currently cheaper on amazon, but that isn't always the case.)

Downsides of this setup are that it requires a lot of manual wiring, and you have to deal with AC power and all the associated safety risks.