This circuit was found in the June 1980 issue of Radio Electronics magazine. The circuit uses an integrated circuit from time, and a power Darlington that must be equipped with a heat sink.
The integrated circuit used in this project is not common today, but it can be implemented with more...
Found in an American publication from 1969, this circuit can be adapted to be used as a shield....
This current meter with many scales was found in a 80s American documentation. The operational amplifier...