Grounding of opamps. Signal or Power?

Arx · 23rd July 2007, 01:09 AM

If keeping seperate star grounds for signal and power, where would the opamps' (buffer and servo) power ground go to? I would assume signal ground, just due to the low currents involved. Is this correct?

-Nick

AndrewT · 23rd July 2007, 08:47 AM

no.
The decoupling across the opamp sends pulses into the power ground. Try to return these pulses separate from the clean audio ground.

23rd July 2007, 01:09 AM	#1
Arx diyAudio Member Join Date: Aug 2003 Location: North Vancouver, B.C.	Grounding of opamps. Signal or Power? If keeping seperate star grounds for signal and power, where would the opamps' (buffer and servo) power ground go to? I would assume signal ground, just due to the low currents involved. Is this correct? -Nick

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23rd July 2007, 08:47 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	no. The decoupling across the opamp sends pulses into the power ground. Try to return these pulses separate from the clean audio ground.