Basic Volume Circuit

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quixote171

Member
Joined 2006
I've done some poking about but so far I'm unabvle to find the answers I need...

Here's the problem.

I have a 101 Disc CD Changer with no volume control running directly into a PA system at work. The PA's volume control is extremely touchy and is either off or blaring.

I'd like to build a small box to insert between them - two rca inputs, two rca outputs and a volume knob. It doesn't need to be fancy I just don't have the technical knowledge to create it. I'm sure I can build it, I just don't know where to start.

Any help would be greatly appreciated.

Thanks!
 
N

Nigel Goodwin

Member
Joined 2005
lpilsley.co.uk
quixote171 said:

I have a 101 Disc CD Changer with no volume control running directly into a PA system at work. The PA's volume control is extremely touchy and is either off or blaring.
Click to expand...

Why not just repair the existing control?, either replace the control or give it a squirt of contact cleaner - personally I find simple WD40 is BETTER than specific contact cleaner, but many people disagree! (however, I've been using it professionally for over 25 years).
 
S

sreten

R.I.P.
Joined 2003
Hi,

your CD player probably has ~ 2V output whilst the PA
input could easily be ~ 100mV input, i.e. far too sensitive.

All you need to do is make up a dual phono to phono cable,
and use good sized plugs at the far end with enough room.

At the far (PA) end solder in a 10K series resistor and 1K
parallel (i.e. 1K resistor pin to case, 10K pin to signal).

job done.

:)/sreten.
 
Q

quixote171

Member
Joined 2006
One more question!

The wiring diagrams I'm looking at show two pots - one for the left channel and one for the right channel. How would I make one volume control to regulate both at the same time?
Forgive me if I'm asking silly questions - I'm a total noob.

Thanks again.
 
A

AndrewT

R.I.P.
Joined 2004
Hi,
if you make up the two resistor attenuator as in post4 you do not need another pot. The attenuator alone will give about 20db of cut and should bring the existing volume control back to a sensible control rotation.

Provided the volume control on the PA is working properly. Could it have a broken track?
 
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