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Old 6th July 2009, 04:23 PM   #1
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Join Date: Jun 2007
Default Guitar Pre amp humming problem

HEllo friends,
i tried to make Guitar preamp I did finish making it on a PCb the resukts are impressive but with few problems

1. A lot of humming 2
the voltage drops from +12 0 -12 to +9 0 -9 once i connect the power to the pre amp board.


Need help to correct these problems

thanks
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Old 6th July 2009, 04:31 PM   #2
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here is the schematic of the Pre Amp
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