This circuit produces sounds of 6 different notes depending on the keys activated. The circuit is from a Radio Electronics from May 1965. The transistor must be equipped with a heat radiator.
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...