This is a dimmer version for incandescent lamps (do not use any other type) from an old documentation from International Rectifier (IR), manufacturer of the triac and of the day. The circuit can be assembled with TIC series triacs and any diac. We can also make changes to operate on 220 V, increasing C2 and C3 to 220 nF; The triac must be equipped with a heat radiator and L1 consists of 10 turns of wire 16 in a 1 cm diameter tube.
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