Powerful LED flasher

john December 10, 2009 2 Comments


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.
  • Alex
    April 26, 2014

    Can I put 3 or 4 leds in parallel ?

    • Seetharaman
      April 27, 2014

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

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