LED or Lamp Flasher

  
* Flashing frequency can be varied by changing R1 value in the 1M - 4M7 range. * This circuit is very efficient when driving a small 3.2V incandescent lamp. In this case omit the LED and R3, connecting the bulb across Q2 Collector and positive supply, further reducing parts counting. * Maximum current drawing of the bulb type used should not exceed 100mA. * In order to facilitate oscillation when a bulb is driven, R2 value should be lowered to 82R or 68R.
LED or Lamp Flasher - schematic




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