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.
Found in Harris' 90s documentation, this circuit uses a zener as a stabilizer. The signals...
The circuit presented is based on the National Semiconductor's LM3524, a component not common...
This circuit is from a 1970 General Electric documentation. It can be found with variations on this...