Electronic Corner

A variable power supply it's a basic tool for each lab. This project shows how to build a cheap one easilly that can go from +/-0.6 V to +/- 23.

Bromograps for photoengraving are very expensive tools, but here we learn to make a simple 2-tubes tool that can impress the photoresist of a board in about 20-30 minutes. You can make this with less tha 10 dollars!

These are two simple reference tables useful to read a capacitor values.

This is a simple re-work of the DC Powered Courtesy Light designed to be powered directly by the 220Vac main.

A very recent problem, but not a large problem, is to run a DOS program that require access to the serial or the parallel port.