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Old 6th March 2012, 11:17 PM   #1
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Default line level volume control

I am looking to build a volume control for conductor monitor. I have a 10k log pot and am not quite sure how to wire it. Any schematics or ideas would be great.

Thanks!
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Old 6th March 2012, 11:37 PM   #2
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Looking with the shaft at the front.
Left hand pin is ground in and out.
Middle pin is audio out.
Right hand pin is audio in.
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Old 6th March 2012, 11:48 PM   #3
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Thanks Nigel.

When I wire it with Pin2 going to Pot Pin 3 (input) and out of Pot Pin 2 (Middle, Output) I got hum and buzz unless the pot was at 100% I'm not sure why that was happening, I guess some sort of voltage imbalance.

braxton
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Old 7th March 2012, 12:17 AM   #4
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It will hum if there is nothing connected to it.
Does it still hum with something connected ? like a mp3 player.
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Old 7th March 2012, 01:39 AM   #5
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Yeah - I've got an mp3 player going into the pot. Here is the whole set up:

Input - Pin 1 -----Pin 1 on the Pot - jumped to XLR Pin 1
Pin 2 -----Pin 3 on the Pot
Pin 3------Jumps straight to output XLR Pin 3
-Pin 2 on the pot out to Pin 2 on the output XLR

does this make any sense?
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Old 7th March 2012, 01:42 AM   #6
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Sescom SES-MKP-29 1-Channel Inline Balanced Audio Volume Control

This is what I am going for.
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Old 7th March 2012, 10:23 AM   #7
DF96 is offline DF96  England
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XLR pin 1 is a screen, not signal ground. Don't connect it to the pot, unless there is a separate ground tag on the pot's metal body.
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Old 7th March 2012, 01:29 PM   #8
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So am I essentially shorting XLR pins 2 & 3 via the potentiometer?
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Old 7th March 2012, 01:48 PM   #9
DF96 is offline DF96  England
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Pins 2 and 3 on the input go to the two outer tags on the pot. Pins 2 and 3 on the output go to the left and middle tags. When the pot is fully anticlockwise (to the left) the input sees 10k, and the output sees a short circuit. At the other extreme 2->2 and 3->3 with a 10k across the line - full volume.

I'm sure that somewhere on the web someone explains how volume controls work.
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Old 7th March 2012, 06:38 PM   #10
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Do you know what resistor value I would use when I short 2&3?
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