line level volume control

[Beaty]

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]

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]

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]

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

 

[Beaty]

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]

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

This is what I am going for.

 

[DF96]

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]

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

 

[DF96]

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]

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

 

[DF96]

You don't short 2 and 3. The pot does that on the output side at minimum volume.

You need to find out how volume controls work.