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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.
You can never have enough VCAs so build build build… I built the circuit board and it works perfectly. I am using about + and – 4 to 5 volts signal in. You can use a higher level of signal in BUT you need to increase R17 (and R37) proportionally. That is, if you want to use + and – 8 to 10 V signals then double the value of R17 (and R37), etc.