[sdiy] steiner parker synthacon vca?

[Neil Johnson]

On 18/11/2012 16:51, dan snazelle wrote:
> anyone have any experience with this circuit or know how it sounds
>
> its interesting as it has a resemblance to the synthacon filter (with that string of diodes
> between Q1 and Q2

David Ingebretsen, who used to/is on this list has a lot of knowledge 
about the synthesystem:

http://user.xmission.com/~dingebre/Synthasystem.html

Looking at the VCA

http://user.xmission.com/~dingebre/VCA.html

I'd hazard a guess that the diodes are used as variable resistors, with 
the matched transistor pair used to generate complementary currents to 
control it, which is why it is important to use a matched pair like the 
SSM2210.

Neil
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