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50MHz frequency counter

This is one nice frequency counter developed by Peter Cousen. This is really low cost frequency counter as it uses elements available world wide.

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The frequency meter can measure frequencies with 1 Hz resolution when measured frequency is up to 100kHz. Other features include:

  • Auto-ranging with floating decimal point.
  • Up to 7 digits displayed.
  • Auto-adjusting gate speed (0.1 sec to 1 sec).
  • Simple, ease to assemble, and highly stable readout.
  • Sensitivity approximately 100 mV RMS (100 Hz to 2 MHz), 800 mV RMS @ 50 MHz.
  • Input overload protected.

Circuit and firmware are available for download. You may want to check out modified version which allows counting up to 80MHz.

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2 Comments

  1. Pingback: Electronics-Lab.com Blog » Blog Archive » 50MHz frequency counter

  2. This frequency counter could read 120Vac / 700HZ?
    Send me email with the answer please.

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