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

    Wien bridge oscillator
    Astable Multivibrator Using 741 Op-Amp
    vna usb
    Bgb707l7esd As An Fm Radio Antenna Lna
    The PCS Scenemaster
    Microphone AGC amplifier
    4 Channel Tranceiver
    Homemade PC Boards
    A common car inverter circuit and principle



    Top