Poor man’s counter

This project will turn your multimeter into a sensitive frequency counter with a wide counting range. You can also use this project to upgrade your old frequency counter and extend the range up to 2.5GHz. This project will describe a prescaler which will work up to 2.5GHz and with very high input sensitivity. The prescaler will divide the input frequency with either 1000 or 10.000.

Poor man’s counter – [Link]

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