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How does triac work?

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We now know that a \u201ctriac\u201d is a 4-layer, PNPN in the positive direction and a NPNP in the negative direction, three-terminal bidirectional device that blocks current in its \u201cOFF\u201d state acting like an open-circuit switch, but unlike a conventional thyristor, the triac can conduct current in either direction when ...

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