This commercial radio for the AM band was sold in Japan in the 1960s. The circuit has an IF of 455 kHz and is powered by batteries. The push-pull output gives a good audio power.
This circuit was found in a 1992 documentation and has excellent sensitivity, using components that...
We found this circuit in an old American documentation. The circuit applies to modern equivalent...
This circuit was found in an English publication from the 80's. It triggers a buzzer (with...