This power source was found in a 1968 Electronics World. The transistors are from that time. The current of each output is limited by the transformer.
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...