[time-nuts] Zero-Crossing Detector Design?

Charles P. Steinmetz charles_steinmetz at lavabit.com
Fri Jul 20 00:39:17 UTC 2012


Michael wrote:

>One circuit I was recommended when I was looking for ideas uses a 1M 
>resistor to feed the output of the inverter back to the input to self-bias

That works OK, but you have to be careful.  Without an input signal, 
there can be excessive quiescent current through the inverter (Vcc to 
ground) -- for which it was not designed.

Best regards,

Charles










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