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amp picking up noise
amp picking up noise
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Old 15th June 2001, 03:24 PM   #11
hugobross is offline hugobross  Europe
diyAudio Member
Join Date: Jun 2001
Location: Flanders, Belgium
1) it could be possible that the noise is picked up at your connectors: in this case you can compare the "signal"-input with the ground of the connector (you can do this with a simple opamp)

2) I've had the same problem with a mixer: be sure that your power supply isn't placed in the neighbourhood of connectors or wires. If this is the case, you can also use a kind of COAX-cable to reduce the noise. It is always better to put the power supply in a grounded metal case.

3) If the noise still excist (after 1 and 2) and when it goes away after grounding the input, you can place a resistor (ex.: 10 Mohm) between the input and the ground.
When you use "jack-connectors" with a "build-in switch", you can ground the input automatically to the ground when you pull out the jack.

Best regards,

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