PowerSupply ??

Discussion in 'General Electronics Chat' started by Dr.killjoy, Mar 3, 2014.

  1. Dr.killjoy

    Thread Starter Well-Known Member

    Apr 28, 2013
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    I am making a power supply and I wanted to know if I could use a single tap transformer and make it a dual output power supply ?? Also do you prefer digital or analog voltage displays ??


    I picked up this transformer today for a good price ...
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    What configuration do you intend for the dual output, 2 separate supplies or - 0 + etc?
    You can either wind on or take off windings as needed within the Va rating of the TXMR.
    Max.
     
  3. Dr.killjoy

    Thread Starter Well-Known Member

    Apr 28, 2013
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    My plan was to take a single tap transmforer and split the output in order to make a dual output power supply using only positive voltage ..
     
  4. MrChips

    Moderator

    Oct 2, 2009
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    You can use a center tap transformer to make two half-wave supplies,
    one full-wave supply, or a positive full-wave and negative full-wave supply.

    Note that in all cases the supplies are electrically connected and hence share a common reference point. In other words, they are not independently floating nor isolated supplies.
     
  5. bance

    Member

    Aug 11, 2012
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    That doesn't look like a centre tapped transformer......
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    What voltages?
    Both isolated supplies?
    It looks as though that is just a single 24v secondary, so you will either have to modify the existing or add a winding or both.
    That must be physically quite small for 48va?
    Max.
     
  7. crutschow

    Expert

    Mar 14, 2008
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    You need a center-tap transformer to make a true dual voltage supply. You could use a circuit to generate a "pseudo-ground" at the 1/2 voltage point of the single voltage output but that's normally only done for low currents, such as for an op amp audio circuit. It's very wasteful of power at any significant unbalanced current levels between the two voltages.
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    At only around 1.5t to 2t/v it does not take a lot to modify, that's the beauty of toroidal's.
    Max.
     
  9. bance

    Member

    Aug 11, 2012
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    I agree with Max, adding a winding would probably be easiest....
     
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  10. Wendy

    Moderator

    Mar 24, 2008
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  11. bance

    Member

    Aug 11, 2012
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    Also I think I'm correct in saying that, since you would have two separate isolated secondaries.. 0-24V & 0-24V it gives you the flexibility to connect them at the output to create a -24 -0- +24 supply.
    Not sure how the current would be affected though...?
     
  12. #12

    Expert

    Nov 30, 2010
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    Skipping most of reading the thread,
     
  13. k7elp60

    Senior Member

    Nov 4, 2008
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    To answer your question about meters for the voltage and current. I prefer digital as they are so inexpensive. Be careful as some require a separate power supply for the meter.
     
  14. russ_hensel

    Well-Known Member

    Jan 11, 2009
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    Could you clarify, I thought I could make a dual supply, each side being 1/2 wave.
     
  15. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Couple of references here.
    Max.
     
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  16. russ_hensel

    Well-Known Member

    Jan 11, 2009
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