12V 6A power supply

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

  1. moded

    Thread Starter New Member

    Mar 2, 2007
    12V 6A power supply


    Hello Guys,

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

  2. Papabravo


    Feb 24, 2006
    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


    Jan 28, 2005
    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.

  4. Gadget

    Distinguished Member

    Jan 10, 2006
    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.