12V 6A power supply

Discussion in 'Homework Help' started by richie, Jan 30, 2007.

  1. richie

    Thread Starter New Member

    Jan 30, 2007
    1
    0
    Hello Guys,

    I just need everyones BIG help, I need to construct a 12VDC 6A rating power supply with 220VAC input, can someone help me with the circuit? I dont want to use big transformers, maybe can someone help me with a circuit having only small trasformer but have amplifier transistor, its value and how to do it.
    Tahnk you very much.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    If it's a linear supply you want to make, there is really no practical way to get atound a stepdown transformer that can supply the current. You can look at the spec sheet for a 7812 regulator with an external transistor current booster.

    A switcher will let you use a small transformer, but at the expense of a more elaborate circuit. Linear Technologies makes a line of SMPS controllers, and offers a free Switcher CAD program to help with the design.
     
  3. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
    4
    And be careful with designing and assembling off-line switcher. I can only say it is not a recommended project for a beginner.
     
  4. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
    So what would power your "Amplifier Transistor"..??

    Really, there is no way around a big transformer, unless you go with the very elaborate, tricky, and quite lethal Switch mode designs.
     
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