Hi, I build a pedal 9V power supply
using a internal PCB trasf. having 15V out stabilized with diodes caps and regulated with 7809 etc... (standard stuff... http://www.generalguitargadgets.com/pdf ... rps_sc.pdf)
It work ok (silent) with 3PDT switch but as I use it with relay switch pedal
it is really noisy..lot of hum.. is it a frequency problem or what ???