This is the circuit diagram a powerful LED flasher. High power LEDs are very common in the market now and a 1W high power LED is used here. Transistors Q1 and Q2 are wired as an oscillator which produces positive pulses of width 20ms @ ½ Hz. Transistor Q3 and MOSFET Q4 inverts this pulse and MOSFET Q5 drives the LED D1.

Circuit diagram .

powerful LED flasher circuit


  • LED D1 is a 1W high power LED.
  • Capacitors C1 and C2 must be rated 10V.
  • Circuit can be powered from two AA cells connected in series.
  • The peak LED current is set to around 250mA.


    • Seetharaman

      No. already 1 watt LED is used. the limit is 350mA only.