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Solid-state light-sensitive switch

Solid-state light-sensitive switch
This electronic switch is designed to be connected direct to the mains, which obviates a low-voltage supply and so keeps the cost and space requirement to a minirnum. The circuit switches a lamp on when it gets dark, and off again when it gets light. The switching is done without a relay, avoiding problems with sparks andmains pollution caused by the contacts and the coil inductance.
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