Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V. The transistors are from that time.
This circuit was obtained in an Electronic Engineering of the 90s. The operational amplifiers and...
The two amplifiers are practically the same, except for the gain. They have the following...
Found in Popular Electronics from the 90s, this circuit reaches a few tens of megahertz. L1, C1...