Could you help me?

Discussion in 'The Projects Forum' started by nousatya, Aug 12, 2013.

  1. nousatya

    Thread Starter New Member

    Aug 11, 2013
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    0
    how can we convert 220v AC to 15v and -15v in DC.
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,716
    4,788
    With a bipolar power supply.
     
  3. Ramussons

    Active Member

    May 3, 2013
    557
    92
    To put it simply, you need a Transformer to step down 220V AC to 15 V AC. You will need Rectifiers to convert the AC to DC and reduce the ripple using Capacitors. You may also need Voltage Regulators.

    If you can tell us more - Purpose, Required Current, How steady the Voltage needs to be, etc; more advice can be given.

    Ramesh
     
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  4. nousatya

    Thread Starter New Member

    Aug 11, 2013
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    no matter about current. the main purpose is to get 15v and -15v in one curcuit.
     
  5. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    Well, good luck then.
     
  6. Ramussons

    Active Member

    May 3, 2013
    557
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    Here you are.

    Ramesh
     
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  7. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
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    That circuit will give you +21V/-21V under no load, and will drop to +15v/-15V only under some undetermined full load.

    Ken
     
  8. #12

    Expert

    Nov 30, 2010
    16,257
    6,762
    True. Better to use a center tapped 24V transformer for an unregulated job like this.
    Use the center tapped 30 volt if you are going to add regulator chips.
     
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  9. WBahn

    Moderator

    Mar 31, 2012
    17,716
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    If you want to stay real cheap, then use something like this:

    [​IMG]

    You would want a 220VAC:12VAC transformer.

    This (or the full-wave version above with a 24V centertapped) will give you about 17V under no load but that will drop as you load it.

    Just saying you want ±15VAC with no current level and no other information to go on makes doing anything more that something real rough difficult.
     
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