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 is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....
This circuit is from a 1968 Electronics World. It acts directly on a high voltage alternating...
We found this circuit in a 1966 documentation. The circuit is intended for a door opening system by the...