PLL (CB7971E)

This common operational PLL circuit was found in a Popular Electronics 90’s. The power supply need not be symmetrical.

Symmetrical 15 V power supply (CB8498E)
Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V....
Common base stage (CB22220E)
This circuit is from an American documentation from the 50's. The transistor is the CK721, and the...
Voltage divider CA3140 (CB24968E)
The figure shows how to use an operational circuit as a voltage divider. The circuit is from a...