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Counter

Input stage

• Logic Inverter, Buffer Gates using BJTs

  https://makingcircuits.com/blog/how-to-make-logic-inverter-b

• Dual transistor

  https://forums.futura-sciences.com/electronique/641302-circu

Frequency Counters

• Arduino Timers

  https://www.gammon.com.au/timers
  https://forum.arduino.cc/t/replacing-the-crystal...
  https://www.youtube.com/watch?v=NSehw7A5bzY (AnasKuzechie)
  https://www.youtube.com/watch?v=fq4rNQ84kec (AnasKuzechie)

• GPS-based frequency counter

  https://forum.arduino.cc/t/gps-based...
  https://github.com/JChristensen/gpsFreq
  https://www.lloydm.net/Demos/GPS_freq_counter.html
  https://www.youtube.com/watch?v=gelZwNwaGcY (LloydsDemos)

• SN74LV8154

  https://www.ti.com/lit/ds/symlink/sn74lv8154.pdf
  https://swharden.com/static/2019/08/03/schematic.png
  https://github.com/qubitqualia/SN74LV8154...
  https://github.com/qubitqualia/SN74HC165...

  https://github.com/swharden/AVR-projects...
  https://github.com/swharden/AVR-projects...
  https://github.com/swharden/USB-Counter...

  https://forum.arduino.cc/t/faster-frequency...
  https://www.ednasia.com/simple-high-accuracy-precision-resol