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Fuse as low-value resistor

Discussion in 'Electronic Basics' started by Bob Masta, Nov 13, 2004.

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  1. Bob Masta

    Bob Masta Guest

    Many years ago, it was not uncommon to see
    fuses in the emitters of power amp output stages.
    I recall an instructor explaining that they were not
    there to act as fuses, but as low-value (fractional
    ohm) power resistors. Apparently back then the fuses
    were cheaper than comparable resistors or something.

    Anyway, he had a simple formula for determining the
    resistance of the fuse, but I've completely forgotten
    it. (By the time I started building power amps, it
    was pretty easy to get the proper resistors.)
    Thinking about it now, it seems that for this to
    work you'd have to know some particulars about
    the fuse construction materials, not just the ampere
    rating, so I suppose his formula was only for specific
    types of fuses. Does anyone have any information
    about this? I was thinking about simple ways to make a
    current-measuring shunt when this bubbled up out
    of the memory banks.


    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
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