This circuit is from a 90s Radio Electronics. The resistors must be precision types and the transistor is a general-purpose type. The operational admits equivalent.
This power supply for model railroad was found in a February 1961 Radio Electronics Magazine. The...
This interesting circuit of the American publication Electronics Handbook Volume XIII 1993 shows a...
Found in a 1978 publication, this circuit uses germanium transistors and drives a small 20 to 50...