[sdiy] Dual soundlab problems

[Dave Magnuson]

Hi Ben,

A passive mixer usually has some problems like you're describing - each 
volume pot will load the others to some degree.   That being said, the pot / 
resistor values have a huge impact on this.    What values did you use for 
the pots and the summing resistors?

Dave

----- Original Message ----- 
From: "ben bwise" <clackjunk at googlemail.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, December 02, 2007 5:54 PM
Subject: [sdiy] Dual soundlab problems


> Hey,
>
> I know maybe I should just ask Ray Wilson directly , I thought I might
> just post this here as its probably quicker and I never post!
>
> I am building a dual soundlab and thought it would be a clever idea
> (but now  not so ) if the VCO's could be integrated. Its a bit hard to
> put in words so I drew a quick picture in eagle light
>
> http://img47.imageshack.us/img47/8171/sl1qb9.gif
>
>
> You see when you turn up the volume of a vco from the other soundlab
> the sounlabs own vco's fade away. I assume this means the other board
> is draining the current?
>
> Am I right in thinking all I need to do is put an op-amp buffer
> in-between? or am I in the wrong ball park? I obviously don't know
> enough about op-amps circuits, ie been looking at the schematic and im
> still trying to imagine what is happening
>
> -Ben ( Mr clack )
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