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. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
