GC hums with separated PS

wchick · 6th May 2007, 07:27 AM

I built a non-inverted GC LM3875. The powersupply was separately housed and a 4 lead umblical cord was connect from it to the amp. I have one signal star ground and one power star ground in the amp; they are connected together with a thin wire. However, I didn't connect any of them to the amp chassis. My question is: is it necessary to connect them to the amp chassis? I don't know what it will do because the amp chassis was not earthed to the socket. What is the usual way to ground stuffs when the amp and powersupply were housed into separate chassis? I'm having audible hum. Thanks for your help

WC

Nuuk · 6th May 2007, 10:09 AM

Please see the GC section on Decibel Dungeon.

6th May 2007, 07:27 AM	#1
wchick diyAudio Member Join Date: Jul 2002 Location: Colorado	GC hums with separated PS I built a non-inverted GC LM3875. The powersupply was separately housed and a 4 lead umblical cord was connect from it to the amp. I have one signal star ground and one power star ground in the amp; they are connected together with a thin wire. However, I didn't connect any of them to the amp chassis. My question is: is it necessary to connect them to the amp chassis? I don't know what it will do because the amp chassis was not earthed to the socket. What is the usual way to ground stuffs when the amp and powersupply were housed into separate chassis? I'm having audible hum. Thanks for your help WC

6th May 2007, 10:09 AM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Please see the GC section on Decibel Dungeon. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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