This small regulated power supply was found in a 1963 General Electric documentation. The special zener diode transistor can be replaced with an equivalent discrete configuration.
Found in a 1990s William Sheets, this automatic gain control for audio amplifiers uses...
The power supply shown can supply voltages of approximately 0 V to 12 V with a maximum current of 4.5 A,...
The consumption of this circuit in the standby condition is only 1 uA. The circuit must be...