This ultra-simple receiver has in the tuning circuit a variable capacitor for AM and a coil, consisting of 100 turns of wire 28 to 32 AWG in a ferrite rod of 1 cm in diameter, with any length. The antenna used must be long and well insulated. We recommend the use of an antenna of at least 10 meters in length and a good earth connection, which can be done in the water pipeline or in metallic parts of the structure of the house, for example, the aluminum frames of doors or windows. The diode can be of any type of germanium for general use, such as 1N34 or 1N60, and the handset is crystal.
