Learn DC voltage regulator circuit, Types of, Fixed and Adjustable. How it works, for example, circuits using Zener diodes, transistors, and more.
Learn Unregulated power supply! Here an important basic. You should know. Diodes rectifier, Designing, reduce ripple, capacitors filter.
This is dual 15v power supply schematic, using LM7815,LM7915,and power transistor and zener diode for voltage stable voltage 15 volts positive and negative. [...]
Small Zener diode voltage regulator circuit with PCB, using transistor and few parts. it is simple and cheap fixed dc source circuit. As one of best choice.
This is a 15V DC Regulator circuit at 400mA using IC-748 and 2N3055. Although it is an ancient circuit, but if you have the equipment ready. we may try to build it.
When I need to use DC regulator power supply 18V 1A for the transistors pre tone control circuits.