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The power supply circuit is shown in Figures 1 and 2. A 7812 positive 3-terminal regulator is used for the main 13.8V 10A regulator, and this is followed by as many power emitter followers as needed for the current you require. The transistors are not critical. I used 2N3771 [...]

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 [...]

LM723 Regulated Power Supply for 13.8V 8A Link
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