Hello:

Can anybody point me to a schematic for a 12 volt power supply capable of providing up to 3 amps of current.

 

hi,

you can try this websites, they hve all you need. if you want to have it regulated, they have the schems.

http://www.sam.dk3.com

http://www.discovercircuits.com

__________________
\"NONE BUT THE BRAVE DESERVES THE FAIR\" ~Shakespeare~

 

just google for "12V power supply" or check following

Here is schematic for 18V / 5A.
If you replace 470 Ohm resistor for 330Ohm
You will get ca 13V.

http://home.cogeco.ca/~rpaisley4/18VPSU.html



Here is one for 10A current and range 5-15V

http://members.tripod.com/michaelgellis/power4.html


Here is 3A version for 3-25V

http://ourworld.compuserve.com/homep...e4.htm#ps3.gif

 

Use an old computer power supply, there are millions around and they are cheap. You will usually have to throw a resistor on one of the +5v sections to make it function correctly without the computer.

http://www.epanorama.net/links/psu_computer.html

Resc.

 

Thanks everyone for the links. I like the idea of the old computer powersupply, cheap and compact.

 

Any idea of the value and the wattage to "trick" the switching power supply there is actually a load attached.

 

Also check some PSU's here:

http://www.electronics-lab.com/projects/power

 

try this link http://www.epanorama.net/links/psu_linear.html

Probably the best info online for designing power supplies...Lots of circuits and theory