[time-nuts] Input filter for data logger

Mark Sims holrum at hotmail.com
Sun Nov 19 20:20:45 EST 2017

Here are Wenzel's input circuits:

The TAPR TICC uses a slightly modified version of the two transistor circuit.

Also check out the LPRO-101 manual for their versions of the single CMOS gate squarer.  One thing they do is add an RC filter to the CMOS gate power supply.  

I use this version (with a 74HC86 as the input gate) on my HP-531xx time interval calibrator circuit.  Wenzel says an HC gate works  better than AC logic if you don't need to handle higher freqs.  It provides surprisingly good performance for such a simple circuit.

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