Hiss at potentiometer mid position - diyAudio
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Old 13th April 2016, 07:57 AM   #1
mitsof is offline mitsof  Burkina Faso
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Join Date: May 2013
Default Hiss at potentiometer mid position

I get a hiss at about mid position of the potentiometer.The strange thing is that the hiss is not at the same place everytime.It moves a bit to the left or the right.

How to fix this?
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Old 13th April 2016, 08:21 AM   #2
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Location: The Jurassic Coast, England. GB
Sounds like HF oscillation. Check with your oscilloscope and I would start by reducing the bandwidth to the audio spectrum only.
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Old 13th April 2016, 09:08 AM   #3
DF96 is offline DF96  England
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Join Date: May 2007
Yes, classic symptom of HF oscillation. To suggest a cure we would need lots more information, such as a circuit diagram.
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