“Last post I 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.
This post I’ll discuss Elton’s design, the LM311 comparator and build a prototype Break Out Board.”