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Thread: Fluorescent Lamp Oscillator

  1. #1
    Unenlightened
    Join Date
    Jul 2017
    Posts
    1

    Default Fluorescent Lamp Oscillator

    Does anyone know why a fluorescent lamp run off DC with a simple resistor ballast creates an oscillation anywhere from 1500 to 2800 Hz ? You will see a small sine wave a few Volts p-p across the lamp with a DC blocked scope. The bulbs that do this are 4W-20W linear bulbs and 22 W circlines as well. Two small bulbs in series will both oscillate at their own frequency creating a beat note. Iíve asked this question before on other forums and no one seems to know why?

  2. #2
    Flashaholic*
    Join Date
    Dec 2003
    Location
    Indianapolis
    Posts
    883

    Default Re: Fluorescent Lamp Oscillator

    One possibility: you're creating a 'relaxation oscillator'. Google it, you'll see...
    Jim

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