line level volume control

Beaty · 6th March 2012, 11:17 PM

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!

nigelwright7557 · 6th March 2012, 11:37 PM

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.

Beaty · 6th March 2012, 11:48 PM

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

nigelwright7557 · 7th March 2012, 12:17 AM

It will hum if there is nothing connected to it.
Does it still hum with something connected ? like a mp3 player.

Beaty · 7th March 2012, 01:39 AM

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?

Beaty · 7th March 2012, 01:42 AM

Sescom SES-MKP-29 1-Channel Inline Balanced Audio Volume Control

This is what I am going for.

DF96 · 7th March 2012, 10:23 AM

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.

Beaty · 7th March 2012, 01:29 PM

So am I essentially shorting XLR pins 2 & 3 via the potentiometer?

DF96 · 7th March 2012, 01:48 PM

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.

Beaty · 7th March 2012, 06:38 PM

Do you know what resistor value I would use when I short 2&3?

6th March 2012, 11:17 PM	#1
Beaty diyAudio Member Join Date: Dec 2011	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!

6th March 2012, 11:37 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	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. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

7th March 2012, 12:17 AM	#4
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	It will hum if there is nothing connected to it. Does it still hum with something connected ? like a mp3 player. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

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6th March 2012, 11:48 PM	#3
Beaty diyAudio Member Join Date: Dec 2011	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

7th March 2012, 01:39 AM	#5
Beaty diyAudio Member Join Date: Dec 2011	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?

7th March 2012, 01:42 AM	#6
Beaty diyAudio Member Join Date: Dec 2011	Sescom SES-MKP-29 1-Channel Inline Balanced Audio Volume Control This is what I am going for.

7th March 2012, 10:23 AM	#7
DF96 diyAudio Member Join Date: May 2007	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.

7th March 2012, 01:29 PM	#8
Beaty diyAudio Member Join Date: Dec 2011	So am I essentially shorting XLR pins 2 & 3 via the potentiometer?

7th March 2012, 01:48 PM	#9
DF96 diyAudio Member Join Date: May 2007	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.

7th March 2012, 06:38 PM	#10
Beaty diyAudio Member Join Date: Dec 2011	Do you know what resistor value I would use when I short 2&3?

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