This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer available that timer and the transistors are germanium types. The circuit is intended to receive MW stations.
This circuit uses a contactor having been found in a 1987 publication. More modern equivalent...
The integrated audio amplifier used in this project is not very common today, but more modern...
This circuit was obtained from an English documentation from 1995. The operational amplifier can...