Here’s an adjustable power supply that is a positive tension. But we use a negative voltage stabilizer. The circuit is something else but it has a big advantage. We now have the final transistor whose Collector often to the house is not to isolate the cooling plate!.
We can now as the transistor to the closet wall plates and screws without insulation vans. This makes the construction of this power supply is very simple. The earth or chassis is now in connection min. The min pin of the 10.000uF is now NOT in the earth!.

The power supply is limited short-circuit proof is not short circuit. If we need and higher flow switch is just another TIP142 parallel to the first. There are also other transistors used by 2N3055.

Below the connections of the voltage stabilizer and the pinouts. The LM337 and LM137 does not need to be cooled here is but a small stream. The voltage transformer depends on the output voltage but should be about 4 volts higher than the output voltage.
Source: http://powersupplycircuit.blogspot.com