[time-nuts] Input filter for data logger
Mark Sims
holrum at hotmail.com
Mon Nov 20 01:20:45 UTC 2017
Here are Wenzel's input circuits:
http://www.wenzel.com/documents/waveform.html
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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