This is my variation on the venerable Atari Punk Console circuit, which I call the Atari “Punch” Console. The output of the original APC is ‘punched up’ with 3 sub-octave square waves which add more harmonics into the mix, resulting in a fatter tone. The sub-octaves are generated with a CD4024 binary counter, and are then summed together. They are mixed into the output by way of R6, which varies between the pure ‘punk’ output of the 556, and an equal balance of the 556 and the suboctaves.
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