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 appears in several configurations in this site. This is from American documentation from...
This circuit was obtained from the component's datasheet, a comparator with voltage reference for...
The purpose of this circuit is to increase the selectivity of receivers with ferrite antennas. The circuit...