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

[Tim Parkhurst]

2011/12/9 Justin Owen <juzowen at gmail.com>:
>
> That's awesome - very cool. Thanks to Neil for this suggestion.
>
> http://www.sdiy.org/juz/vca_comparison_03.jpg
>
> The response of the 2164 and the single tranny VCA are much closer now - except for the fact that the single Tranny VCA seems to be 'scaled' about 0.5V higher(?) than the 2164.
>
> http://www.sdiy.org/juz/vca_data_01.jpg
>

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?


Tim (simple transistor circuits never cease to amaze me) Servo
-- 
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- H.L. Hastings