File:Vactrol VCA (Silonex).PNG

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English: Linear control law VCA with vactrols as remote-control pots.

Based on schematic in Audio level control with resistive optocouplers. (PDF version) p.6. Retrieved April 18, 2021.
Drawn in Proteus v.4.
Circuit modified to show explicitly different audio and control grounds and compartmentalized into audio, control and remote control blocks.
Underlying schematic PD (1970s art, if ever patented).

Note that if the inputs of OA2 allow rail-to-rail operation, the control circuit can be easily adjusted to run off a single power supply, which could be as low as +5V (all it needs is to drive a LED). The same PS rail can act as Vref, setting the scale for Vc control voltage. Vref does not even need to be regulated, as only Vc/Vref ratio is important.
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Author East of Borschov
Other versions Derivative works of this file:  Прецизионный УУН на оптопарах.PNG

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current21:22, 16 November 2010Thumbnail for version as of 21:22, 16 November 2010945 × 770 (35 KB)East of Borschov (talk | contribs){{Information |Description={{en|1=Linear control law VCA with vactrols as remote-control pots. Based on schematic in ''[http://www.silonex.com/audiohm/levelcontrol.html Audio level control with resistive optocouplers]''. ([http://www.silonex.com/audiohm

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