Wild shot from the back of the class MrC....Have you meaured with a DVM that the earth pin on the mains cable to the amp to a screen on the input Phono socket is 10R and that the metal casework is very low R to the same earth pin?
Then do the same with the Pi connected to the amp whilst the Pi is powered by its PSU.
Hum Reduction
- Dave the bass
- Amstrad Tower of Power
- Posts: 12276
- Joined: Tue May 22, 2007 4:36 pm
- Location: NW Kent, Darn Sarf innit.
#16 Re: Hum Reduction
"The fat bourgeois and his doppelganger"