The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and 2N2431 can be used. The circuit is from the 80's and makes use of transformers.
This 90's Radio Electronics circuit uses uncommon integrated circuits today. The circuit is...
The integrated circuit used in this configuration of the 1990 Motorola Linear Databook is not...
This circuit, from an American publication of 1974, provides a 0.005% regulation with a variation of...