12V 6A power supply

Thread Starter


Joined 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



Joined 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?


Joined 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.



Joined 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.