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12V 20Amp Power Supply by IC 7912 2N3055

2015-03-23 00:21  
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Here is12 volt power supply20A , USELM7912and 2N3055 .
It easy circuit , Low cost. see detail more in image.

Thispower supplyis the result of the use of components at hand (junk box). The core of the project is a number of2N3055transistors and a transformer with a 16 volt 18 amp secondary winding.

12V 20Amp Power Supply by IC 7912   2N3055

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 a7912 negative regulatoras thevoltage control. Then by using available NPN transistors to boost output, an output up to 20 amps can be obtained at 12 volts.

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

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