Schematic DIY KitRev counter For motorcycle, car, model
To know the exact speed of a machine is often very important to determine the optimum power range, or to avoid damages. There are a number of circuits for measuring (Contactless, directly or inductively coupled). Here links to some circuit examples.

Here you will find Schematic Circuit Diagram for DIY and further information on Rev counter
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Nice project for a tachometer and LED
Interface module for tachometer

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