This circuit was found in a publication by Edelman from 1924. The power comes from the battery and the listening is through a high-impedance headphone.
We found this circuit in a Popular Electronics of the 90s. The circuit can be easily mounted...
This converter has coils according to the reception and converted frequency bands. We found it in...
In this 1970s receiver, the coil has a primary with 100 turns and a secondary with 20 turns, both...