El-Cheapo Fluoro Ballast


Posted on Feb 7, 2014

This simple circuit can start small (15W or less) fluorescent tubes such as those used in PC board exposure and EPROM ultraviolet erasure boxes. As you can see, the tube`s filament heaters are not used. Instead, ignition is provided by a voltage tripler formed by diodes D1-D3 and the two 6. 8nF 2kV capacitors. At switch on, C1 charges up via R1 unt


El-Cheapo Fluoro Ballast
Click here to download the full size of the above Circuit.

il the gas in the tube breaks down (around 700V). C1 then discharges through the tube, lowering the resistance enough to sustain continual AC current flow. C1 then continues to act as the ballast, with R1 included to prevent the three diodes shunting the tube on positive mains half-cycles.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    ProfiLab-Expert 4.0
    250Watt sub-woofer amplifier
    Wireless Lan for AVR microcontrollers
    Soil Heater For Plants Circuit
    Full Wave Rectifier Circuit with Averaging Filter
    mini projects
    schematic diagram of my geiger counter
    Outdoor Garden LED Solar Light Circuit
    Map Bot
    22 Watt Car Subwoofer Amplifier



    Top