A photo or slightly activated relay normally open relay in the closed
circuit / contact with the light. In this circuit, a photodiode is used
to sense light. The photodiode has a high resistance in the absence of
light strikes. The photodiode is connected to the reverse biased state.
The only current flowing through it will be due to minority carriers.
Photo Sensor Control Relay Circuit Diagram
When light falls on it, the minority current carriers in the wake of
increasing the diode provides a low resistance. Because the voltage
across the diode will not be sufficient to bias transistor Q1 and will
be reset. Where there is darkness, the resistance increases photodiode
and the voltage across it will be enough to move forward bias the
transistor Q1 of the relay ON. The diode D2 is used as a diode to
protect transistor switching transients produced relay. In this way, the
load on the relay contacts can be switched on and off using light
strikes the photodiode.
Photo Sensor Control Relay Circuit Diagram
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