The UNVERIFIED Stripboard Lounge

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Layout should definitely be marked “unverified” (in the image itself).

I recommend a Schottky diode such as 1N5817 from the +12 V rail to ground. In “Figure 2” that would be D7 but use a Schottky, not a rectifier. Discussion:

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 …