This modern XTAL radio replaces the galena crystal for a germanium diode as the 1N34 or equivalent. The antenna coupling capacitors are ceramic and the phone must be magnetic high impedance. In modern alternative can be used one piezoelectric capsule in parallel with a resistor of 22 k. The coil can be wound with 100 turns of 28 AWG wire in a cardboard tube having slightly more than 1.2 cm in diameter so as to slide inside a ferrite rod 1 cm in diameter. The movement of this bat is that the will tune into stations. The antenna should be quite long and it is important the connection to the earth. Antennas of at least 5 meters in length should be used.





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