[sdiy] Change response from Lin to Log to Lin to Exp?

[Tim Parkhurst]

On Sun, Dec 11, 2011 at 8:41 AM, Justin Owen <juzowen at gmail.com> wrote:
>
>>That offset looks more like it might be the ~0.6V voltage drop across
> the transistor. Maybe you need to bias the base 0.6V in the opposite
> direction?
>
> Yup, completely right - and completely obvious once it was pointed out to me!
>
> Setting the Base Bias to 1V and adjusting the values of the resistor from the Bias V to the Base and the resistor from the CV to the Base got me within an average of 0.05V error compared to the curve of the 2164.
>
> Nice. Thanks.
>
> J
>

Sounds like you got some good results, and a well behaved one
transistor VCA. Can you share the final schematic?

Tim (you can never have too many VCAs) Servo
-- 
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- H.L. Hastings