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AM 2MHz inductive lamp

Discussion in 'Electronic Design' started by Chris Jacobson, May 28, 2007.

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  1. I was looking for a way to audio AM a low MHz signal, and then I
    discovered this product, the Philips QL inductive lighting system. Sheets/Philips QL85.htm

    In particular, the 2.65 MHz 85W power supply, sold separately. I
    assume this is a sealed circuit, but is there any relatively simple
    way to amplitude modulate the output side with an audio sine or square

    By "simple" I mean some kind of plug-in device, or a few components.
    For example, could it be modulated inductively using a transformer, or

    The supply itself costs $250, so I would like to know in advance if I
    have a fair chance of success.

    BTW, I am only interested in using the PS for its signal, not to
    connect to a lamp.

    Chris Jacobson
  2. Rich Grise

    Rich Grise Guest

    EEk! And, No.
    What is it you intend to do? What's your end application?

  3. Chris Jones

    Chris Jones Guest

    You might find that you can buy an amateur radio transmitter second hand for
    that price and then it would come with the modulation facility, and
    possibly some specifications too.

  4. What about wrapping a coil around the lamp and driving it with the HV
    audio frequency. First, enough of the 2MHz lamp QL PS output would be
    attenuated to keep the lamp just below igintion point. The boost from
    the coil would then effectively initiate and modulate the plasma.

    If this would work, what is the best option for attenuating the 2MHz
    on the output side of the QL PS?


  5. joseph2k

    joseph2k Guest

    Due to the physics of the lamp, and the design of the lamp, cable and the RF
    power generator to operate as a single system to provide a very stable
    output the answer is no. I repeat, the cable and lamp are part of the
    circuit, brand lock-in is just one of the results.
    How about modulating 30 each 3 W white LED's instead?
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