Hello guys! While digging dipper into MidiBox SID project I came across some new questions. Powering questions.   Switching PSUs with high switching frequency are regulated, so we have to bypass regulator. But they have a switching noise/crackle. Is it a good idea to grab a switching PSU on e.g. 15v and pass it though a 7812 ? Will this remove the noise?   Are computer PSUs good? TK mentioned 50Hz hum if core module is powered from USB. Maybe the same with computer PSUs, but why? Where does