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A small vactrol module

This is a module design I got on YouTube. It uses a single N-channel JFET and a couple other components to build a passive vca. It works a lot like a DIY vactrol, where the signal is actually powering the circuit itself. I found the design from Synth DIY Guy on YouTube.

I-AM-O JFET passive vca diagram (courtesy Synth DIY Guy)