My build progress

[Dud]

@willow2x

sometimes one of the rails doesnt power up

maybe this can fix your problem (at the end of this topic)

PSU startup problems

From the My build progress topic: and a couple more people spoke up saying they’d had similar issues with Frequency Central/MFOS style wall wart supplies. Seems worth breaking out to its own topic. It’s not always on -12V. It does seem it’s the regulator shutting down due to overcurrent, probably associated with a capacitor which once it starts charging up pulls less of a load, so that restarting is successful. Is it the 10µF (or whatever) bypass capacitors on the module power rails? Is it …