Found in a 1969 EDN, this high current circuit, not indicated in the documentation, uses transistors from that time. The input voltage can be between 9 and 11 V.
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...