This power supply was obtained from an Electronic Design from the 90's. The circuit applies to other 3-terminal regulators. The maximum output current is 200 mA.
This circuit was found in an American publication from 1968. The transistors are from the time,...
This preamp with several inputs using germanium transistors from the time was found in Japanese...
This circuit uses two sensors that are placed at the intersection of a miniature railway, causing...