Thought you might find this interesting.
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Yeah, this is really awesome ! I happened to also see this on reddit, where the artist offered this explanation:
"The circuits I added generate sound and visuals. The monitor's VGA cable connects right to the bottom of the zapper. Hsync and Vsync pulses are generated with an schmitt inverter oscillator and binary counter. Colors are generated with a three stage phase shift oscillator that has sound injected into it."
I would love to learn more or even see some sort of "instructable" on how to make this!