We found this circuit in a 1967 IEEE documentation. The circuit uses discrete components of the time based on the 1.13 MHz frequency used with oscilloscopes at the time.
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...