Power supplies

During the first years of my education, I decided to design my own Bench Power supply, with the following specifications:

  • 20V/1A
  • Works with 1 DC input voltage (or rectified AC voltage)
  • Adjustable output voltage/output current
  • Voltage/current visible on character LCD

The results can be found at the page CA3140 power supply. Eventually, it was hard to get a stable current limiter. Therefore I do advise not to build this power supply.

During my search for “the best power supply”, I found quite some usefull information. On this website you’ll find the best design and links available on the internet.

Digital voltmeter for power supply

The digital voltmeter has the following specifications:

  • Input voltage/current max 5 Volt
  • LCD in 4bit mode
  • Atmega8 (because i had some of them left)

Schematic

Hex file