The circuit presented is a Japanese commercial radio from the 1960s. With a 4.5 V supply, it is a super-heterodyne type with an IF of 455 kHz. 6 germanium transistors are used.
This conventional source with transistors was found in a 1989 documentation. The transistors must...
The components used in this 80's circuit are uncommon today. The circuit is intended for...
This circuit produces the sound of a motorcycle or an outboard motor. The frequency is adjusted in the...