![How to build a simple laser tachometer How to build a simple laser tachometer](https://www.electronics-lab.com/wp-content/uploads/2015/08/how-to-build-a-simple-laser-tach.jpg)
Did you know you can use an LED as a light sensor? In this video I show you how to use this phenomenon to build a laser tachometer capable of measuring the RPM of mechanical devices.
How to build a simple laser tachometer – [Link]
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