This circuit was obtained in a 1967 Electronics World. The components are still common today, the SCRs can be replaced by equivalents and the unijunction transistors the 2N2646.
Found in a 90s Radio Electrconics, this circuit is an operational one with a power stage using two...
Found in a 1969 Electronics World, this circuit is intended for amplifying analog cable TV...
This simple regulated power supply was found in a 1977 documentation. The zener diode determines the...