Posted on Aug 25, 2012    10552

For a dark photocell, high resistance, the vohage across the diac rises rapidly with the line voltage due to the current through C 1, triggering the diac early in the cycle.

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When the photocell resistance is less than about 2000 n, the drop across it is limited to less than the diac triggering voltage, and the load power is shut off.

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