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  • Author Author: tariq.ahmad
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How Electromechanical Relays Work -- DC to Daylight 09

In this theory-based episode, we take a quick look at the evolution of the relay, how it changed telegraphy, and how to actuate a relay safely from a low-current source like a microcontroller. The method I typically use to select the proper base resistor for a given BJT transistor is presented, as well as why you always see a freewheel protection diode across the relay coil; the resulting waveform with, and without protection diode are viewed on the oscilloscope.

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  • Good explanation - I like the history of the relay lesson. I tend to use FETs instead of BJTs. You mentions a couple of terms for the diode - there seem to be lots of terms that people might use: freewheeling diodes, kickback diodes, clamp diodes, commutating diodes, suppression diodes, or snubber diodes

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  • Good explanation - I like the history of the relay lesson. I tend to use FETs instead of BJTs. You mentions a couple of terms for the diode - there seem to be lots of terms that people might use: freewheeling diodes, kickback diodes, clamp diodes, commutating diodes, suppression diodes, or snubber diodes

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