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Few questions about DIY CMOY pocket amp

post #1 of 9
Thread Starter 

Source: http://tangentsoft.net/audio/cmoy-tutorial/

 

Hey all, new to this site and looking for a bit of electrical expertise and help.

 

I'm currently stuck on figuring out how to wire my Left and Right channels to a single potentiometer.  This potentiometer is a 10k with SPDT for an on and off switch.

 

My question is, since I have a single gang pot, do I need to purchase a second pot for the second channel?

Is there any way to wire two channels ( left & right ) to this?

 

http://i50.tinypic.com/2lndbn9.jpg

 

Single gang pot, with 3 terminals, the center is the output terminal. The outside terminals are for resistances that either start at the top or from near 0.

 

http://i50.tinypic.com/28ck4u0.jpg

 

back of the potentiometer with the spdt switch.  

post #2 of 9

I'm not 100%, but with only one output you'll only get mono sound. 

post #3 of 9

You need a dual ganged pot, or do away with the pot and control the level from the source

 

cheers

FRED

post #4 of 9
Thread Starter 

Thanks, would either of you by chance be able to lead me to a place that sells 10k dual gang pots with an SPDT? I've been looking around and haven't had any luck

post #5 of 9

So I don't break the rules I'll send you one, just pm me your address

 

cheers

FRED

post #6 of 9

A single-channel pot like that probably isn't audio taper, besides. It's almost certainly linear-taper.

post #7 of 9
Thread Starter 

Fred_fred2004, pm'ed

 

 

Quote:

Originally Posted by tangent View Post

A single-channel pot like that probably isn't audio taper, besides. It's almost certainly linear-taper.

 

 

 

not sure exactly what you mean by this Tangent.

post #8 of 9

Short version: decibels aren't a linear scale, so if you use a linear pot, it behaves incorrectly for audio. You need to use a pot with a nonlinear response so it "sounds right" as you turn it.

 

Long version: my article, "Notes on Audio Attenuators".

post #9 of 9
Thread Starter 

Ahh, thanks for the background info.  And looks like I'll be picking up a 10k pot from your store, thanks!

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