It means you should never touch the heatsink or screw it to a metal enclosure! Typical applications include motor control, industrial and domestic lighting, heating and static switching.”Īttention: the mounting base of the BT138 Triac (by default it is used to attach a heatsink) is connected to the Pin-2. According to the BT138 datasheet: “Planar passivated four quadrant Triac in a SOT78 (TO-220AB) plastic package intended for use in applications requiring high bidirectional transient and blocking voltage capability and high thermal cycling performance. The load is in series with the Triac and the AC line, so the Triac determine the amount of power that should be delivered to the load. It is easier to understand by demonstrating the Arduino code and output wave later.
Exactly after a trigger (a zero cross), in a simple term, we have to decide how much power we want to deliver.
So as it is clear, we gonna use the zero crossing pulse as a trigger for the main controlling circuit.
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