How to design and build a dual power supply producing +/- 5v,+/-9 ,+/-12v,+/-15v

Discussion in 'The Projects Forum' started by Enzon777, Oct 11, 2015.

  1. Enzon777

    Thread Starter New Member

    Oct 11, 2015
    1
    0
    How to design and build a regulated dual power supply producing +/- 5v,+/-9 ,+/-12v,+/-15v from a 220V ac supply
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,148
    1,791
    I'd start with a few more specifications. Do you want eight separate fixed power supplies, or do you want and adjustable power supply? How much current do you want the power supply to provide? Do you wan to use linear regulators or did you have a switch mode power supplies in mind?

    Regardless of those answers you'll need to find a center tapped transformer with one or more secondary wingdings. I'd recommend a dual center tapped secondary model with 8VAC and 18VAC.
    Next you'll need some bridge rectifiers, and last you'll need some filter capacitors.
    https://www.google.com/search?q=Bas...XqVBfvSGM:&usg=__I8Y2T9a89-PcmlYODbhc3vBR9yo=
     
  3. #12

    Expert

    Nov 30, 2010
    16,321
    6,818
    Start with a transformer, center tapped with dual 15 volt windings. Add rectifiers, capacitors, and:
    LM7815
    LM7915
    LM7812
    LM7912
    LM7809
    LM7909
    LM7805
    LM7905

    Assemble on pad-per-hole perf-board with each voltage supplying the next stage.
    Use enough capacitance on the outputs to slow down the start voltage so the positive voltages don't block the negative regulators from starting up.
    I've heard that a Shottky diode across each output will also stop the regulators from fighting when you first switch the power on.
     
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  4. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,648
    764
    After building many different ones, I finally built one very similar to that and is what I use most of the time.

    I just added a small, variable one which I could use as signal in analog circuits.
     
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