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
Click here to download the full size of the above Circuit.

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).




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    RGB LED Controller with PIC18F25K20
    DC fan control circuit for power amplifier Schematic Diagram
    2000v high voltage low current power
    a single transistor smart battery charger
    infrared IR proximity detector/ IR beam barrier circuit diagram
    Solar Panel to Battery Switch Circuit
    Parachute Recovery System
    80M CW QRP rig
    Multiplicative DA converter IC inexpensive 8 DA circuit
    Adjustable from 3 to 9V 100mA power supply circuit
    Blood pressure sensing circuit diagram BP01-type pressure sensor



    Top