Electricity and Magnetism > Electromagnetic Radiation

DCS# 5N10.67

---

CRYSTAL RADIO

---

---

APPARATUS

crystal radio	202-19-F
amplifier/speaker	202-20-B2

---

DESCRIPTION

The radio receiver consists of an inductor in parallel with a variable capacitor.  Vary the capacitance until the resonant frequency of the circuit matches the carrier frequency of a local AM radio station (550-1600kHz).  A diode rectifies the signal on the way to the amplifier.  Unfortunately, you can pick up WOBL at just about any frequency, and in fact with just a long wire and a speaker.

NOTES

Connect the ground wire to a building ground, stretch out the antenna wire and position it for best reception.