lcipher3

Not required if the supply is 9v also not recommended if it's supplied with 9v since these regulators need a min of a few volts headroom...

Zero hum - I was a bit worried with all the xfmers and choke close together but they are all oriented 90 deg. Dont know if that really...

I packed mine in a home-made box about 7x5x2 - zero noise in mine from any transformer coupling. I did add a choke in the power supply...