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Voltage Controlled Amplifier Schematics

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Dual Voltage Controlled Amplifier - I

Dual Voltage Controlled Amplifier - I

Here is the schematic, PC board layout, and parts placement. Always breadboard first!

http://www.musicfromouterspace.com/analogsynth/vca.html

Dual Voltage Controlled Amplifier - II

Dual Voltage Controlled Amplifier - II

The function of this dual VCA is very similar to the other one. It uses one less chip but one more transistor. It uses the built in LM13700 buffers instead of OP-AMPs.

http://www.musicfromouterspace.com/analogsynth/newdualvca.html

Voltage controlled amplifier

Voltage controlled amplifier

This one uses a diode bridge.

http://www.4qdtec.com/cca.html