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Another 40MHz frequency meter
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.
The frequency meter is build on a veroboard, using only 3 components and 8 resistors. It is designed to be plugged into any standard bread-board.