I don’t want use my MIDIbox SID any longer with two powersupplies. I’ve found a Switching-PSU from an external harddrive with 12V and 5V. Is it possible (secure and without humming) to place those connections behind the regulators 7812 and 7805? Will the power be stable enough or is it better to remove them and to solder in bridges there and connect the new psu at the power connectors?
If it were me, I would likely steer clear of the hard-drive PSU. You don’t know it’s switching frequency (unless you’re lucky and they put it on the label along with the wattage) and many of them use annoying connectors that may make finding a replacement difficult.
