LDR – Light Dependent Resistor with Relay Circuit Diagram

LDR – Light Dependent Resistor with Relay Circuit Diagram

LDR Circuit Diagram

The circuit of LDR is an electronic circuit built with  Light Dependent Resistor, relay, Darlington pair, diode, & resistors shown in the below circuit diagram. A voltage supply is given to the load. The required DC voltage of the Light Dependent Resistor circuit is supplied from a bridge rectifier circuit or a battery. This circuit changes the AC supply into a DC. The bridge rectifier circuit uses a step-down transformer to step-down the voltage from 230v into 12v.

LDR circuit diagram

Light Dependent Resistor Circuit Diagram

LDR Circuit Operation:

  • The diodes are connected in the form of a bridge used to alter the AC voltage into DC.
  • The voltage regulator is used to change the 12v DC-6v DC, and then, this DC voltage is supplied to the entire circuit.
  • A 230v AC supply for both the bridge rectifier and the load is to be kept continuously for continuous operation of the light sensor circuit.

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