Circuit diagram of brightness control relay

Shown for the brightness control relay circuit. Resistors R1, R2 and R3 form a light-sensitive resistor voltage divider circuit,

when the light is dark to a certain extent, VT1 base voltage rises to make VT1, VT2 conduction, the relay pull-J. R1 is used to adjust the motion sensitivity. The light trigger level circuit greatly influenced by the supply voltage and ambient temperature.

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