This commercial radio with 3 earphone listening transistors was manufactured in Japan in the 1960s. The medium-wave circuit uses germanium transistors and is powered by a 9 V battery.
This is a slightly different configuration of full-wave power control than we found in an old...
This 1-transistor timer was published in Radio Electronics magazine in December 1960. The circuit has...
This type of circuit is widely used in old cassette recorders and tape players, regulating the...