12V 6A power supply

Discussion in 'General Electronics Chat' started by moded, Mar 2, 2007.

  1. moded

    Thread Starter New Member

    Mar 2, 2007
    1
    0
    12V 6A power supply

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    Hello Guys,

    I just need everyones BIG help, I need to construct a 12VDC 6A rating power supply with 220VAC input

    Thankssssssssssssssssss
     
  2. Papabravo

    Expert

    Feb 24, 2006
    9,905
    1,723
    Why don't you just buy one? Oh..the thrill of the chase..OK

    Start with a transformer.
    220VAC primary, 12 VAC, 6A secondary
    Add a Bridge Rectifier
    Add a Filter Capacitor

    That gets you an unregulated supply.

    For a voltage regulator you can use a zener diode and a pass transistor
    or a linear regulator with an external pass transistor
    or a switching regulator.

    What are you up for?
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Here is a link to a schematic to a 5 volt power supply that you can use as a guide.

    For the current output of 6A you are going to need to use a fairly large heatsink on the linear voltage regulator to keep it from overheating at your maximum load.

    hgmjr
     
  4. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
    Lately I've been using surplus Fan cooled CPU heatsinks for Power supplies with a bolt on bi-metal to switch the fan on above 50 celcius. Just using a 3 terminal regulator and a suitable "boost" transistor, and the entire regulator electronics and CPU heatsink become a compact wee module...(not forgetting appropriate venting). The Transformer and Smoothing caps are now the largest bits in the setup.
     
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