Bicycle back Safety Lights


Posted on Feb 7, 2014

This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles as a back light, or to put on by jogger/walkers. IC1 is a CMos version of the 555 IC wired


Bicycle back Safety Lights
Click here to download the full size of the above Circuit.

as an astable multivibrator generating a 50% duty-cycle square wave at approx. 4Hz frequency. At 3V supply, 555 output (pin 3) sinking current operation is far better than sourcing, then LED D1-D6 are connected to positive supply. In order to obtain an alternate flashing operation, a second 555 IC is provided, acting as a trigger plus inverter and driving LEDs D7-D12. D13 is permanently on. The LEDs are arranged in a two series display as shown below, with a center LED permanently on. This arrangement and the alternate flashing of the two series of LEDs provide a pseudo-rotating appearance.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Ramp generator
    Electronic Mini Projects
    TDA7375 Car Audio Amplifier Circuit
    The designs and realizing of the electric current based on CAN bus line voltage transducer
    Compensating the forward voltage drop of a diode signal rectifier
    Transistor Testers
    A dark detecting circuit for your jack lantern
    AC Locomotive Auxiliary Equipment
    Model 1681 Instruction Manual
    Pushbutton Relay Selector
    thyristor
    Oscillator Control & GPS
    BT9404 type excitation switch control circuit
    A control circuit reversing braking and reverse grading speed control function



    Top