it works on the energy that is delivered by the antenna (upper inductor), but the signal is very weak. the 2nd inductor is zelde tuning capacitor is a capacitor having a capacitance of about 500 picofarads. the diode is a germanium diode (AA112). and the risistor is a Headphone having a resistance of at least 2000 ohms. get. sound is very weak and the receiver is not fantastic but it is still fun to make
