This solid-state relay circuit (SSR) or shield is from a 1995 Electronics Now. With it we can connect power loads using input CMOS or TTL signals. Eventually R2 must be changed according to the trigger signal. 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 6 V x 100 mA transformer or more. In this circuit we have a circuit that derives the control voltage from the power grid so that it is DC to supply the coupler. The Triac must be equipped with a heat radiator.
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