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Ground Isolation

Discussion in 'Electronic Basics' started by seware, Dec 21, 2004.

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  1. seware

    seware Guest

    I have a project in the design phase that I need a bit of advice on.

    The project has two circuit stages both powered from the same power supply:

    1)Generate bit stream via microntroller
    2)Amplify and output bit stream

    The project has a high potential for short circuit across the output, so I
    am planning to use a fast optocoupler to provide some isolation on the bit
    stream line to protect the microcontroller from feedback spikes. But can't a
    spike feedback through the shared ground as well? How do I go about
    isolating the ground between the two stages while feeding them from the same
    power supply. My only idea from my very few years of electronics is an
    isolation transformer. Any other ideas or am I going at this from the wrong
    direction. Thank you and Merry Christmas!

  2. If the supply is isolated from Earth and all you are worried about is
    a short circuit across the output, all you need is some sort of
    current limit built into the output, because a short between either
    side of the output signal and Earth would close no circuit.
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