Français : Poste a diode (OA85) pour l'écoute de la bande 520 kHz à 1620 kHz.
English: Modern crystal radio using a OA85 diode and piezoelectric earphone, receiving the 520 - 1620 kHz AM broadcast band. The two black wires (A and B) were the antenna and ground wires, one attached to a long wire antenna and the other to a water pipe or a stake driven into the ground to provide a return path for the antenna current to Earth.
{{Information |Description= {{fr| Poste a diode pour l'écoute de la bande 520 kHz à 1620 kHz. }} |Source=travail personnel |Date= 2002 |Author= F1jmm |Permission= |other_versions= 1 }} Category:Crystal radios