diy 12v powersupply

[herm0016]

i am starting to work on building a power supply for an amp i built from a kit. i have ideas on the methods i will use, mainly a large toroidal transformer and 2 diode rectifier circuits (some how put 180 out of phase and then added back together to cancel out noise in the end dc voltage. i would like to get 12 to 13 Vdc. starting with standard 120-125 Vac 60hz. currently planning on starting with this design and modifying it. any input would be great.

http://www.adireaudio.com/Files/UcDPowerSupply.pdf

[hermanv]

We need to know the current you need in order to help.

Here's a link with many examples and some theory:
http://www.epanorama.net/links/psu_linear.html

And a link to a toroid transformer manufacturer that will sell to individuals:
http://www.plitron.com/

[herm0016]

i don't need any more than 2 amps for my current application. but if i can build it so I have a good amount of head room and not spend too much more i will.

[hermanv]

This will work for you. It is simple and straight forward. Use a 2" x 3" heatsink with about 1" fins.
http://www.mitedu.freeserve.co.uk/Circuits/Power/boosti.htm

You can buy the parts at Digikey on-line. I would pick a transformer whose output voltage was about 12VAC, this should give you about 17 VDC no load.

For supplies of this size (24 watts) a toroid offers little advantage, maybe a standard transforrmer from Signal Tranformer Company makes more sense.
http://www.belfuse.com/SignalTransformer/

[spasticteapot]

I'd just use a cheap surplus SMPS power supply off e-bay. I paid $8 for mine, and it looks to be a very nice solution - low noise, high efficiency, and small.