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Homework Help: What are these types of diode circuits?

  1. Oct 12, 2016 #1
    1. The problem statement, all variables and given/known data
    For each of the circuits, draw the waveform. The voltage drop across each diode is 0.7V
    2. Relevant equations

    3. The attempt at a solution
    I know that both of these are using diode bridges, but is there a specific name for these circuits?
    I think the waveform for Vo1 and Vo2 are rectified sine waves with peaks of 5.6 and -5.6, respectively. (at least that's what my notes say)
    I have no idea where to start with #2 though.
    Any hints/help would be greatly appreciated.
  2. jcsd
  3. Oct 12, 2016 #2


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    Suitable names would be..

    1) dual rail unregulated power supply
    2) single rail unregulated power supply with battery backup.

    Try deleting the battery and diode temporarily. What would the Vo waveform look like then?

    What happens if you apply that waveform to a circuit containing just the diode and battery. Is the diode forward or reverse biased?

    What happens to Vo if you disconnect the AC mains? What happens to Vo "between the peaks" when AC is present?
  4. Oct 12, 2016 #3
    Is my assumption with #1 correct?
    Would the waveform for #2 without battery/diode simply be a full wave rectified sine wave with a peak of 13.44V?
  5. Oct 12, 2016 #4


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    Both correct so far.

    I haven't checked your conversion from rms to peak voltage yet.
    Last edited: Oct 12, 2016
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