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Power supply for lamp

Discussion in 'Power Electronics' started by Millip, Dec 21, 2017.

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  1. Millip


    Dec 21, 2017
    I have made a lamp but I am only getting a faint pulsing light from the globe.
    Here is the set up I have currently
    12v 2amp AC power supply
    20W halogen globe.
    3 amp wire

    what do I have wrong?

    many thanks
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Welcome to EP.

    Show us photos, please. The verbal description is insufficient.
    What do you mean by "3 amp wire"? Wire is usually measured in AWG or in cm². How long is the wire?

    Do you have a multimeter to take some measurements?
  3. duke37


    Jan 9, 2011
    12V at 2A is 24W and you wnt to supply a filament lamp of 20W. All looks OK on the surface but a filament lamp has several times less rsistance when cold. I would suggest that the power supply cannot provide enough current to get the filament hot.

    An AC supply may be just a transformer with no overload protection built in. Details of the power supply are needed.
    Robert_fay likes this.
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