High-intensity LED Warning Flasher


Posted on Feb 6, 2014

This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subject to traffic regulations and legislation). White LEDs only are recommended if the circuit is used as a bicycle front light (i. e. for road illumination) and red LEDs only when used as a tail lig


High-intensity LED Warning Flasher
Click here to download the full size of the above Circuit.

ht. During the day, the two 1. 6-V solar cells charge the two AA batteries. In darkness, the solar cell voltage disappears and the batteries automatically power the circuit. The flash frequency is about one per second and the LED on-time is about 330 ms. The duty cycle should enable the batteries to power the circuit over night. The circuit is composed of three parts. Under normal daylight conditions the batteries are charged through diode D4. In darkness, pnp transistor T1 is switched on, supplying battery current to the second part, a low-frequency oscillator comprising T2 and T3. The third part is the LED driver around T4. It conducts and switches on the LEDs D1-D2-D3 when the collector voltage of T3 swings high. Two LEDs (D1, D2) are 20, 000-30, 000 mcd high-brightness yellow types and one (D3) is a normal 3-mm red LED for control purposes. Of course it is possible to increase the number of LEDs to obtain higher brightness. However you will run into limitations regarding the maximum collector current of transistor T4. For really high power applications a MOSFET transistor is suggested instead of the common or garden BC547B.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    60W audio amplifier
    Telephone-controlled tape starter
    Rf-wideband-adjustable-agc-amplifier
    Receiver Frequency-Converter Stage
    Electronic Bagpipe
    LM35 Digital Remote Thermometer circuit and explanation
    Long Period SCR Timer
    simple fluid level sensor circuit
    bjt Low voltage/current power supply for wide range of inputs
    Fire Alarm Using Thermistor
    mosfets tester
    27MHz CB Amplifier Circuit
    Subcutaneous Transmitter
    Basic Transistor Circuits
    Interfacing to Sony Cameras
    AVR Color Clock



    Top