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Designed to fit on a breadboard, Ikalogic’s frequency meter uses “only 3 components and 8 resistors” including an ATmega16 –

This article shows how to build a small, cheap and simple frequency meter, without any fancy, out of reach components. The simple proposed design can measure frequencies up to 40 Mhz with errors below 1%! This degree of precision will be more than enough to debug most of your analog and digital circuits, and will give you the ability to analyze many aspects that you were unable to see before.

Build your 40 MHz Frequency meter!