How to MakeBuild a Crystal Radio

############################# Video Source: www.youtube.com/watch?v=VqdcU9ULAlA

Step-by-step instructions for making a tunable crystal radio. This is a radio that gets its power from the radio waves. I made it almost entirely from junk except for the diode (1N34 germanium diode) and the earpiece (though you can use a speaker from a phone instead.) The capacitor is made from aluminum foil and a paper towel roll. The coil is rolled on a toilet paper roll. The wire is enameled magnet wire. For the antenna I use a 15 foot wire laid out on the floor. For the earth ground I connect a wire to the ground in the household wiring. • I originally got this circuit from the book Radio Receiver Projects You Can Build by Homer L. Davidson. • For this circuit, the diode must be germanium. The following is a partial list of germanium diodes that should work: • 1N34A, 1N60, 1N91, 1N119, 1N270, 1N277, 1N283 • The following are not germanium diodes and may need a long antenna or a powerful radio station nearby to work: • 1N4148 (silicon, found on a lot of circuit boards), B16 (zener diode), 1N5060 (avalanche diode) • The crystal earpiece (piezoelectric earphone) and/or 1N34 germanium diode and/or air core variable capacitors can be ordered from most of these sources: • http://www.midnightscience.com • https://store.scitoys.com/radio-kits-... (their variable capacitor is for if your coil has a ferrite core and is smaller than the one in this video) • You can find the circuit diagram shown in this video on this page: • http://rimstar.org/equip/crystal_radi... • See also: • How a Crystal Radio Works • • How a Crystal Radio Works • Crystal Radio Troubleshooting and Tips • • Crystal Radio Troubleshooting and Tips • Make Crystal Earphone/Earpiece for Crystal Radio • • Make Crystal Earphone/Earpiece for Cr... • Use Earbuds/Earphones with Crystal Radio • • Use Earbuds/Earphones with Crystal Radio • Make a Crystal Radio Coil with Taps • • Make a Crystal Radio Coil with Taps • Make Razor Blade Diode for Crystal Radio/Foxhole Radio • • Make Razor Blade Diode for Crystal Ra... • How to Make Crystal Radio Amplifier for Speaker • • How to Make Crystal Radio Amplifier f... • How to Make Amplifier for Crystal Radio Earphone • • How to Make Amplifier for Crystal Rad... • Steps for How to Make Amplifier for Crystal Earpiece • • Steps for How to Make Amplifier for C... • How to Make an AM Radio Transmitter (so you can transmit to your crystal radio) • • How to Make AM Radio Transmitter • Amplitude Modulation with Simple AM Radio Transmitter • • Amplitude Modulation with Simple AM R... • Follow me on Twitter: • https://twitter.com/#!/RimStarz • http://rimstar.org

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