FM Crystal radio / FM 광석 라디오
1. L - 4 turns #18 copper or silver wire, 12mm inside diameter, tapped at 2.5 turnsAnt - 7 inches of #18 bare copper wireC1 - 18 pf ceramic capacitorC2 - 50 pf air variable capacitorD - 1N34 diode or rock crystalR - 150K resistor 2. L - 5 turns AWG#18 bare copper or silver wire, 12mm inside diameter, tapped at 2.5 turnsD - 1N34 or rock crystal diodeC1 - 82 pf capacitorC2 - 80 ..