This circuit is from a 1995 Electronics Now. With it we can connect loads of power using low current switches or sensors. TR1 can be any Triac of the TIC series with current according to the load and voltage according to the supply, which can also be 220/240 V. The transistor can be the BC558 and the transformer 6 V x 100 mA or more. In this circuit we have a circuit that derives the control voltage from the power grid so that it is DC. The Triac must be equipped with a heat radiator.
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