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

    Motor controller with Analogue Opto Isolator
    Variable audio oscillator 20hz to 20Khz
    Using Solid State Switches Instead of Mechanical Relays
    arduino controllers and sensors
    AMIS-49200-XTP Fieldbus MAU
    AMPLIFIER WITH FORCED EQUILIBRIUM ADAPTOR
    AM base circuit
    Clock synchronization circuit diagram
    A circuit diagram of the digital pressure signal conditioner MAX1459 4 ~ 20mA current transmitter
    Metal Detector Cirduit with IC TDA0161



    Top