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Homework Help: Creating a simple DC power supply.

  1. Jun 27, 2010 #1
    1. The problem statement, all variables and given/known data
    In one of my labs for a circuit analysis class we are told to design a simple DC power supply. The power supply will have three outputs, +4.5V, -4.5V, and an adjustable output from 0-11V. I have already done most of this and the question I have is could you design this so that multiple outputs could be used at the same time and not affect the others.

    Here is the basis of our power supply:

    Where our outputs are connected to the load branch coming of the diodes.

    The way I have mine now works fine as long as you only use one of the outputs. I have noticed most of the power supplies I have used have multiple outputs but only one can be used at a time. Is this really unavoidable or unpractical?
  2. jcsd
  3. Jun 27, 2010 #2


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    Gold Member

    I have never come across a power supply (commercially made) that could only use one of many outputs at once.

    What sort of circuit analysis class are you doing this for, SMPS DC/DC converters perchance? A 'simple DC power supply' is probably relative to your current studies.
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