This simple low current circuit was found in a Radio Electronics magazine from August 1960. The circuit does not use transistors in regulation, but only zeners directly.
This circuit is from a 1956 Sylvania publication, using the company's transistor. The transistor is from...
This configuration makes use of an integrated circuit of the time having been found in a 1976 NASA...
We found this circuit in a 1974 documentation. The NPN transistor can be the BD135 and the PNP the...