Strange problem with this wiring/grounding scheme

Leolabs · 17th April 2007, 02:27 AM

When nothing is connected to the inputs,very very quiet;when something is connected to both channel input,at max volume,there will be some low frequency noise on both channel.

Is this a ground loop problem between channels and how to tackle it???

BWRX · 17th April 2007, 02:38 AM

Try disconnecting the shield from ground at the amplifier end.

Depending on how you have this wired and connected, multiple sources may not like sharing ground connections if they are all connected to earth ground at the outlet.

AMV8 · 17th April 2007, 09:59 AM

Hi

I place a thermister between audio ground and earth/chassis within each pre amp and power amp. This avoids a direct connection between audio ground and earth but at the same time allows a direct connection in the event of a fault within any item. I use 10 ohm 15 amp thermister for power amps and 10 ohm 5 amp thermister with pre amps.

I connect between equipment as you seem to with the shield of interconnects connected at the pre amp only.

I think if you follow the above you should avoid problems with earth loops.

Don

17th April 2007, 02:38 AM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	Try disconnecting the shield from ground at the amplifier end. Depending on how you have this wired and connected, multiple sources may not like sharing ground connections if they are all connected to earth ground at the outlet. __________________ Brian

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17th April 2007, 09:59 AM	#3
AMV8 diyAudio Member Join Date: Jan 2005 Location: near london	Hi I place a thermister between audio ground and earth/chassis within each pre amp and power amp. This avoids a direct connection between audio ground and earth but at the same time allows a direct connection in the event of a fault within any item. I use 10 ohm 15 amp thermister for power amps and 10 ohm 5 amp thermister with pre amps. I connect between equipment as you seem to with the shield of interconnects connected at the pre amp only. I think if you follow the above you should avoid problems with earth loops. Don

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