building a power supplier

Discussion in 'General Electronics Chat' started by enid, Jun 6, 2010.

  1. enid

    Thread Starter New Member

    Jun 4, 2010
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    hi, how are you.

    I am such a beginner in electronics so I'd be very grateful if someone can help me.
    I have to build a simple power supply that work with an input of 220v AC and has an output of 1A and 12V DC. I have to build the circuit in two deferent ways:
    1-with transistors
    2- with LM723

    thank you !
     
  2. Bychon

    Member

    Mar 12, 2010
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    So...what's the question?
     
  3. enid

    Thread Starter New Member

    Jun 4, 2010
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    0
    can anyone help me building these circuits?
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    googling can find u lot's of circuits.
    find one, post it, and then we can discuss it.
    do ur home work first
     
  5. enid

    Thread Starter New Member

    Jun 4, 2010
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    i have google it but i did not find anything similiar.
    anywhere , thank you !
     
  6. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    U want a series regulator and an IC regulator.
    try these for series regs
     
    enid likes this.
  7. retched

    AAC Fanatic!

    Dec 5, 2009
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    The first thing you need is a transformer to drop the line voltage to a safe level. And a level closer to your end result.

    If you look at the datasheet for the LM723 you will find its input voltage range.

    You need a transformer that will drop the voltage to about 2 volts above that number.

    One of the reasons you want it a few volts higher, is you will be needing a bridge rectifier to convert the AC to DC.

    Bridge rectifiers use diodes to do the work. As we all know, diodes will drop the voltage a certain amount. So, you have to be sure the starting voltage on the secondary of the transformer is high enough.
     
    mahmoodsani likes this.
  8. bertus

    Administrator

    Apr 5, 2008
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    enid likes this.
  9. enid

    Thread Starter New Member

    Jun 4, 2010
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    thank you very much to everyone :))
     
  10. Wendy

    Moderator

    Mar 24, 2008
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  11. mahmoodsani

    Member

    Jun 3, 2010
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    thanks v much for such brief explanation
     
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