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How to build LED or Lamp Flasher

2014-12-23 09:19  
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Minimum parts counting

Designed for 3V battery operation

Circuit diagram

LED or Lamp Flasher-Circuit diagram


R1 33K 1/4W ResistorR2,R3 47R 1/4W ResistorsC1 10μF 25V Electrolytic CapacitorD1,(D2 LED(s) (Any type and color)Q1 BC560 45V 100mA PNP TransistorQ2 BC337 45V 800mA NPN Transistor


Power supply can vary from 2 to 4.5V.Add D2 to obtain two LED alternate blinking.D1's on-time is shorter than off-time. The opposite regarding D2.You can also use D2 only, shorting D1.Don't change resistors' values.Flashing frequency can be varied changing C1 value from 2.2μF to 100μF and higher.This circuit is very efficient when driving a 3.2V lamp. In this case omit the LEDs and R3, connecting the lamp at Q2's collector and to positive supply, further reducing parts counting.

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