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Old 2nd May 2008, 08:11 PM   #1
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Default Need help with volume control.

I recently finished my SE 6550 amplifier (see "class project")- and I ran the prototype direct from my cd player with no problems. Ever since I wired-in the volume control (100K pot)- I've got 120Hz hum.

Any suggestions??
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Old 2nd May 2008, 09:00 PM   #2
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You probably need to ground the pot. On an alps, you can connect a grounded wire to the screw on the pot case. Otherwise, use some copper foil to ground the shaft.
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Old 3rd May 2008, 01:34 AM   #3
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On pots with a metal cover/case,I usually use some sand paper,and solder a short wire to it,which runs to ground.

If it's not grounded (through the short wire,or chassis mounting,or w/e),I always get hum when I touch the pot shaft to adjust volume,etc.
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