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Franconio 26th March 2009 11:55 AM

Balanced Wet/Dry control
I am trying to figure out how to make an easy to build balanced stereo Wet/Dry control. I want to mix a stereo balanced signal with another stereo balanced signal (namely it will be the compressed signal) and have a pot to control the blend of the two. So I have 12 wires going in and 6 wires coming out.
Any hints? Can I do that with a single multi gang pot?

mjf 27th March 2009 11:16 AM

2 Attachment(s)
gainstage one is summing up the signal (perhaps one pot per channel is enough - if not use for every channel a pot)
and stage two (optional) inverts the signal back to phase integrity(if built with variable gain (pot) you can use it as a master volume per channel.....)
perhaps it can help.......

gain wire 21st April 2009 11:15 PM

2 Attachment(s)
I believe you can. excuse me, I should say "I would try that because I in theory it can work"

but you'll need a 4 gang pot, which isn't easy to come by, especially in a 1KOhm to 5kOhm value...

Here is my basic idea:

I don't really understand Franconio's idea, where is the blend pot?

Minion 23rd April 2009 04:43 PM

The problem with useing a 4 gang pot is that each wafer in the pot won"t have close enough resistance to retain CMRR and a proper Ballanced signal , the Noise performance will degrade which negates the whole purpose of Ballanced signals...


gain wire 23rd April 2009 04:53 PM

Hmm... yeah well there was bound to be something. That's why I said "in theory it can work".
Oh well!:rolleyes:

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