Battery-Operated Black Light Circuit


Posted on Oct 28, 2012

The battery-operated black light uses a U-shaped, unfiltered, black-light tube, which requires approximately 250 Vac to operate. To create the 250-Vac 6-V battery, the circuit uses a one-transis-tor blocking oscillator that drives a ferrite inverter transformer. A blocking oscillator turns itself off after one or more cycles. In this circuit, it consists of CI, PI, Ql, Rl, and Tl. The oscillations are sustained because the base of Ql is connected to one of the windings on Tl. Transformer Tl is a step-up transformer that consists of a ferrite core, which has a few turns on the primary and many turns on the secondary.


Battery-Operated Black Light Circuit
Click here to download the full size of the above Circuit.

The oscillating (ac) output of Ql is fed to Tl, which, because of its large turns ratio, converts the low-voltage signal into a high-voltage alternating current, which is coupled through resistor R2 to the black- light tube. Resistor Rl and trimmer resistor PI limit the current flowing through the circuit. As the control on PI is rotated, more current flows in the circuit, producing a brighter light output.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Voltmeter circuit
    Two buttons Safety relay
    Improved non-inverting integrator
    RTD thermometer
    Audio Astable Multivibrator Using IC 555 Circuit
    Microcontroller-based automatic night light circuit
    led thermometer pcb
    Liquid-Crystal Display (LCD) Tester
    Simple Siren Circuit
    13 GHz Frequency Counter Prescaler
    Buck power conversion by the MAX639 + 5V fixed output



    Top