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State Variable Filter

Jürgen Haibles clone of the EDP Wasp VCF. Its a state variable filter build around one CD4069UB CMOS inverter, that is used as opamp. This circuit is operated at a single 5V supply. It has a rather interesting distortion.

Original description...

A useful addition would be to have a switch to have the distortion either pre or post filter.

Wasp filter clone

wasp filter clone schematic
5V Adsr to go with this filter A 5V EG/LFO for use with this filter