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Old 18th July 2008, 01:39 AM   #11
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Join Date: Sep 2007
Looks like some question at ground.
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Old 31st July 2008, 03:58 PM   #12
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Location: Boston
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I also think there is a serious ground issue. Has this problem been resolved?
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Old 31st July 2008, 04:34 PM   #13
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Join Date: Mar 2006
Location: Kennesaw, GA
Question: What type of input coupling cap is being used? If metallized polypropylene, or something similar, with the volume up tap on the cap gently, or even just move your finger towards it. If it picks up the tapping, or starts to hum as your finger gets closer, remove the cap and reverse the leads. Then try the same test again.

Also, you mention 7812, and 7912 voltage regulators. Do they have the recommended bypass caps? What is the DC voltage feeding them?

Don Taylor
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