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About PWM smoothing; essentially a 4-stage RC network but with buffering between (some) stages. Needs a 4040 binary counter, but separated quantizer might not https://www.youtube.com/watch?v=3v1yTFsypqA Sample & Hold MK's S&H, though maybe move the arrow shaped cutout in the same size as traces - .3mm for non-power lines, .6mm if carrying power - MK uses a ground plane on only.

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