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Big coil in power supply ?

Discussion in 'Electronic Basics' started by little billy, May 28, 2004.

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  1. little billy

    little billy Guest

    Hello,

    There is a big coil in my power supply near the
    banana terminals (from the inside.) The coil is
    large in the sense that it is very thick, i.e.
    about 1.5mm diamater, but it only has about 8
    turns. It appears that a wire from near this coil
    goes to the current meter of the supply (it's
    a regulated professional one btw). I was just
    wondering, is this the current sense resistor, and
    if so is there any reason it is wound as a coil?
     
  2. Almost certainly.
    To save space.

    The tiny inductance it has may also improve the stability of the
    control circuit when the supply is operating in current limit mode.
     
  3. Al Borowski

    Al Borowski Guest

    Sounds to me like an inductor, to filter out high frequency noise on the
    output.

    I might be mistaken though.

    cheers,

    Al
     
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