This Japanese commercial radio with 5 transistors is from the 60s and is powered by 6 V. It is a conventional superheterodyne configuration with good performance.
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...