Also it is a high efficiency regulator using an ic regulator ua723 and power transistor tip3055.
30v power supply circuit.
This is a 0 30v variable power supply circuit diagram.
Utilize some heatsink compound paste to the bottom of the transistor and attach it on the heatsink.
0 30v 0 10a laboratory type adjustable power supply i mentioned in the article of the relay bypass circuit for regulated power supplies the k7200 kit version is 1 1 clone there is almost no difference except a few changes in pcb design and the use of 6 power transistors.
In this project an adjustable power supply circuit is designed which inputs ac mains and provides 0 to 30v 2a dc voltage as output.
How to test this 30 v variable power supply circuit hook up a voltmeter to gnd the points and out and set rv1 until the preferred output voltage is arrived at.
A wide variety of 30v power supply circuit options are available to you such as qi.