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Questions tagged [vca]

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Operation of Swing-Type Voltage Controlled Amplifier

I'm trying to understand this Swing-Type Voltage Controlled Amplifier which is found in the classic Roland TR-808 drum machine. What I understand currently is that the input signal to the base of the ...
2
votes
1answer
100 views

What's the purpose of this circuit section?

I'm experimenting on VCA circuits and found the same (or similar) pattern in many linear VCA projects found in internet using LM13700 OTA. The specific section I'm curious is made by an Op-amp, a ...
2
votes
2answers
287 views

Why does this JFET attenuator distort the signal this way?

I have been trying to build a simple VGA using an op-amp and JFET for gain control. I get good results over a small range of voltages (like factor of 10) but as soon as I try to improve this, the ...
1
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1answer
430 views

How to understand V2164 VCA control voltage per dB?

I'm designing an audio circuit which includes the V2164 VCA IC. This chip is a clone of SSM2164. I take a "Basic VCA Configuration" circuit which is supposed to give a unity gain with 0V control ...