Introduction: Dark Detector Using BC547 Transistor

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About: i am an electronics hobbyist.

In this tutorial we will make a dark detector circuit using BC547 transistor.

Step 1: Working:

when LDR will detect dark then LED start glowing automatic and when LDR will detect light LED goes off.

Step 2: Components Required:

  1. 1 x BC547 transistor
  2. 1 x LDR
  3. 1 x 330ohm resistor
  4. 1 x 100k ohm resistor
  5. 9V battery
  6. Breadboard

Step 3: Connection:

Connect the all components according to above circuit diagram.