This circuit was obtained from an American documentation of 1967. The circuit provides a 30 mA output current for driving standard Nixie indicator tubes 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...