This 1967 commercial radio covers 6 wave bands selected by appropriate coils. The circuit currently uses critical components, such as coils and transformers.
With this name, the English publication where we found this circuit indicated a sensitive touch...
The output of this circuit can be a crystal phone or a piezoelectric capsule. The circuit tests the...
This simple medium wave receiver was sold in the 1960s in Japan. The circuit used germanium...