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Old 12th February 2020, 11:43 PM   #61
nigelwright7557 is offline nigelwright7557  United Kingdom
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Join Date: Apr 2008
Location: Carlisle, England
Originally Posted by cobretti View Post
Not 100% sure, but that's what I think it is. Magnetic field being picked up.
I made a amplifier testbed.
Transformer, bridge and caps inside an open case with some fibreglass on top to put pcb on.
First pcb design hummed badly and the grounds were all correct.
Just turned out to be transformer too close to pcb and high impedance input was picking up the magnetic field.
Moved transformer about 4 inches away and problem fixed.
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