This circuit was found in a 1967 RCA documentation. The components are of the time. The circuit limits the current to 50 mA when the battery is fully charged.
This circuit was found in November 1984 Radio Electronics magazine. The frequency is given by C1...
This step uses germanium transistors such as the AC151, GE2, and others having been found in a...
This medium wave radio with 7 germanium transistors was manufactured in Japan in the 1960s. Its...