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A TRIAC is a three-terminal semiconductor component that conducts current in both directions when triggered. It is often used to control high-power AC currents, both as a switch and for "dimmers" for controlling lamps or electric engines.

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MOC3021M + JST16A-600B TRIAC Circuit problem: Resistor blowing up

Right out the gate I noticed something "weird" as the LED lamp barely lit even if the triac was off. … I still don't know if the triac or the MOC are still alive, but I have brand new ones to try again.. I just wanted to be sure that's not a design flaw. …
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TRIAC Controlled Motor circuit: PWM logic doubt

The triac needs 10mA of current to activate, and according to my calculations it haves 18mA (5v/270ohms) when the pin is HIGH, but how is it turning the triac off if it keeps the ping high? … I captured the PWM signal WITHOUT the motor attached.. so, no voltage was present in the triac's MTs TRIAC Datasheet …
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