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I am using the circuit in figure 24 - it toggles the output at each zero crossing. And even with the voltage divider (3.5:1), I am limited to just over 200 hz or so.
What you suggest sounds like the best solution - just divide it into a range that is known to work. We're not doing ABS, so ultra-low resolution is not important. I'll order a couple of 74AHCT74's from digikey.
Though it still would be nice to go through the code and properly comment and document it. Anyone know if there is there a reason it isn't commented?
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