REMOTE_CONTROL_FOR_LAMP_OR_APPLIANCE

Published:2009/6/25 1:38:00 Author:Jessie | From:SeekIC

The circuit uses the primary current of a small6.3 volt filament transformer to actuate a triac and energize the load. When switch S1, 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, R1, is required to prevent such triggering. R1, is adjusted for the highest resistance that will not cause the triac to trigger with S1 open. When single-pole remote switch, S1, 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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