When last the AUDIODiWHY blog posted, they described a subcircuit that would take an audio signal from maybe 50K to below audible frequencies and turn it into a square wave – useful for turning audio into a clock signal for an MPU.
It worked, but discussion ensued at my geeky audio meetup: is there an easier way to do this?
Of course there is….Elton at OtterMods had a similar circuit, with lower parts count, based on an LM311 comparator.
Elton’s design worked great, nice clean square waves regardless of a sloppy signal at the LM311’s inverting input.
The BoB featured a low parts count–and, if going forward I used an SOIC LM311 and SMD resistors, this design could get really small.
They hope to use this for input buffering and rising edge detection for a clock multiplier, perhaps based on an RP2040.
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