This small commercial radio for the MW band with germanium transistors was found in Japanese documentation from the 1960s. The circuit is powered by a 9 V battery and has a 455 kHz IF.
This circuit was found in a 90s Integrated Circuits Data Book. It interfaces a data line with a...
The basis of this project is an integrated 566 (not to be confused with a 556 which is a double...
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...