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 simple transistorized radio for the medium wave range "extracts energy from the earth" using a...
This circuit is from a cookbook to timers. The circuit is triggered by an external signal and,...
We found this circuit in an old General Electric documentation. In fact, PUTs are not common...