- Published in issue 7/1991 on page 40
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.