Need help with volume control.

cadaverdog · 2nd May 2008, 07:11 PM

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??

dsavitsk · 2nd May 2008, 08:00 PM

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.

DigitalJunkie · 3rd May 2008, 12:34 AM

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.

2nd May 2008, 07:11 PM	#1
cadaverdog diyAudio Member Join Date: Aug 2004 Location: Indiana	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??

2nd May 2008, 08:00 PM	#2
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	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. __________________ http://www.ecpaudio.com

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3rd May 2008, 12:34 AM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	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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