12V 20Amp Power Supply by IC 7912 + 2N3055

Here is circuit power supply 12V 20A , USE IC 7912 and 2N3055 .
It easy circuit , Low cost. see detail more in image.

This power supply is the result of the use of components at hand (junk box). The core of the project is a number of 2N3055 transistors and a transformer with a 16 volt 18 amp secondary winding.

As it is constructed using the parts I had available at the time it may not be the most cost effective design if all parts are purchased new.
Circuit

Rather than use a more conventional arrangement with a positive supply it was easier to use a negative supply and make use of a 7912 negative regulator as the voltage control. Then by using available NPN transistors to boost output, an output up to 20 amps can be obtained at 12 volts.

Read More Source:
http://radarclub.tripod.com/Homebrew.htm
Thank you

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