Remote control for lamp or appliance

Posted on Jul 19, 2012

The circuit uses the primary current of a small 6 volt filament transformer to actuate a triac and energize the load. When switch Si, in the six-volt secondary, of the transformer is open, a small `magnetizing` current flows through the primary winding. This magnetizing current may be large enough to trigger the triac. Therefore, a shunting resistor, Rl, is required to prevent such triggering. Rl, is adjusted for the highest resistance that will not cause theitriac to trigger with SI open

Remote control for lamp or appliance
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When single-pole remote switch, SI, closes, the secondary of the transformer is shorted and a high current flows through the 120-volt primary. This triggers the triac and energizes the load. When the triac conducts, current through the primary stops and thus prevents burning out the transformer.

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