Only for reference this is a circuito f a commercial receiver of the year 1958. The circuit uses coils and transformers hadr to find in our days. The circuit is destinated to receive MW stations.
Found in Philips' 90s documentation, this small source can use modern transistors like the BD135...
This code switch was found in a 1990 Electronics Handbook. It can be mounted with BC558...
This circuit is from a 1968 Texas Instruments documentation. The components are from the time and...