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 [...]

When you want DC power supply Circuit , model to fine the value Voltage get 0-30V for apply general work. I thinks this circuit may is appropriate , because of give current get 2 Amp enough be usable experience all get comfortablely. By it uses ordinary equipment seek easy be IC [...]

This is a high quality power supply with a continuously variable stabilised output adjustable at any value between 0 and 30VDC. The circuit also incorporates an electronic output current limiter that effectively controls the output current from a few milliamperes (2 mA) to the maximum output of three amperes that the circuit can deliver. This [...]