Bicolour LED flasher circuit

Posted on Feb 5, 2014

Basically this circuit is similar to some flasher circuits already published in using IC555 as a free running multivibrator. The only difference lies in the way it flash using bi-colour LEDs. When output at pin 3 of IC 555 goes high it operates on group of LEDs. By inverting the IC`s low output by pnp transistor BC558 the other group of LEDs is m

Bicolour LED flasher circuit
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ade to flash. AS shown in circuit diagram the LEDs are arranged in alternately reversed order so that a twinkle twinkle little stars  effect is produced. The 100K preset VR1 sets the blinking rate. To maintain simplicity I omitted the current limiting resistor. So, the red and green LEDs may not flash with equal intensity (as they require different threshold voltage).

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