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, obtained from ancient English documentation, produces a pulse every 24 hours when a 50...
This circuit found in a 1981 documentation consists of a transistor tester of general use and that...
We found this circuit in the November 1974 Radio Electronics magazine. The frequency depends on C1...