Circuit Project Electronic

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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 [...]

This is circuit Power Supply regulator 13.8V 20A.
Use part Electronics IC 7912 and Transistor 2N3055 x 6.
It is High Current power supply and easy circuit.
The starting problem was to recycle some things: chassis, transfomer, heat sinks etc: what to do?
A power supply, of course !
This time I’ve stabilized the negative side using 6 cheap 2N3055 [...]

This power supply is not designed to use the prefabricated IC voltage regulators, even though such regulators do exist. The 7812 and 7912 ICs are quite capable of providing regulated +12 volt and -12 volt outputs, respectively. However, we have two problems with doing it this way. First, each regulator provides an output voltage accurate [...]