Tutorial on Routing Electrical Signal with Mechanical Relays

 In this two part series we take a look at mechanical relays: different types, terminology, theory of operation, and design considerations. We finish part one with a demo of an armature relay showing its inside, how to actuate it, and capture its flyback voltage waveform with an Oscilloscope. In part 2 we look at a simple circuit that allows us to control armature or reed relays with a simple digital pin from a microcontroller. We also look at a circuit design that allows us to avoid hot switching when using mechanical relays.

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