If you need a 230V relay, but all you have is a 12-volt relay. No problem build the simple circuit to drive a 12-volt relay directly from mains voltage! No 12 volt power supply required. All you need is 4 diodes and a capacitor, to convert a 12-volt relay to a 230-volt relay.
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Power a 12-volt relay directly from 230VAC mains voltage
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