simple lamp dimmer 220v using triac

A very simple dimmer circuit with only the essentials. (In this circuit, the values are given for a BT138 at 220V AC, for 115V AC you may have to experiment with the values. ) R1 can vary from one triac to another, put a 220K © trimmer in its place and adjust. After adjustment, measure the result and replace the trimmer with an ordinary resistor of

the same value.

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