My take on the famous WSG Filter. Originally designed by Ray Wilson (http://www.musicfromouterspace.com/) in his Weird Sound Generator. I found the schematics around the internet, but I needed to sync it with other stuff somehow, so I tried to figure out a way of adding an external controller and came up with this "External Control" input, where I plug a photo resistor soldered to a 3,5mm jack.
Fine, Coarse and Resonance controls as well as the aforementioned photo resistor input, that can be placed towards a flashing LED (of a tremolo or a drum machine or whatever) and make its wobbles in sync!
Soldered on veroboard and housed on 1,5mm metal sheet with laminated label.
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