[sdiy] Best VCA circuit for synth module..

Mattias Rickardsson mr at analogue.org
Thu Oct 4 21:04:26 CEST 2012


If I get it right, the SSM2164 datasheet says that the temperature
error is smallest around 0dB amplification... might come in handy when
designing a circuit around it, I guess?

/mr

On 4 October 2012 20:48,  <blacet at blacet.com> wrote:
> SSM2164 is a more modern component with a bit better performance. It's
> expo but you can linearize it with one section in the feedback loop ala
> Mike Irwin's article in EDN.
>
> I think temperature compensation is usually left out of most designs as
> the drift is not detectable when you are talking about volume. Most
> transconductance ICs have the 3500ppm drift.
>
>
>> What would be the best VCA core design already available
>> on the net ?
>> I need log/lin choice feature on control voltages.
>> Temperature stable, low noise, high headroom..
>> LM13600, LM13700, CA3080..??
>> The summing control voltages part is no problem.
>> The important part is the VCA core itself.
>> The best design I found so far seems to be this one:
>> http://hem.bredband.net/bersyn/VCA/lm13600%20vca%202.htm
>> but I don't know if it's LIN or LOG and
>> I'd rather have both possibility on the same board.
>>
>> Any suggestions ?
>> Thanks
>> J-Pierre
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