[sdiy] Lowest distortion neede for VCA

[Harald]

Did you measure the differential input voltage?
How did you do it? Or did you calculate? I use a differential probe.

Am Montag, 16. September 2013, 01:23:55 schrieb Brian Castro:
> For synth VCA's used for attentuating audio signals I go right in the sweet
> spot as per the datasheet. For teh LM13700 I use the linearizing diodes and
> go for an Id and Ibias(max) of 0.8mA, and scale the input for 50mVp-p. This
> is pretty much the case with most synths I've documented or seen in service
> manuals.
> 
> Regarding linear vs log there may be some assumptions made here. If you're
> using the VCA as a volume control for a VCO etc, and the voltage is being
> controlled by a linear pot, then certaintly you can use a log control
> input. In this case you may consider the SSM/Cool Audio 2164. If it's to be
> controlled by a CV from a modulaton source (ADSR etc..) then yes usually a
> linear control input is used.
> 
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