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.\r
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I originally got this circuit from the book Radio Receiver Projects You Can Build by Homer L. Davidson.\r
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For this circuit, the diode must be germanium. The following is a partial list of germanium diodes that should work:\r
1N34A, 1N60, 1N91, 1N119, 1N270, 1N277, 1N283\r
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The following are not germanium diodes and may need a long antenna or a powerful radio station nearby to work:\r
1N4148 (silicon, found on a lot of circuit boards), B16 (zener diode), 1N5060 (avalanche diode)\r
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The crystal earpiece (piezoelectric earphone) and/or 1N34 germanium diode and/or air core variable capacitors can be ordered from most of these sources:\r
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(their variable capacitor is for if your coil has a ferrite core and is smaller than the one in this video)\r
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You can find the circuit diagram shown in this video on this page:\r
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See also:\r
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How a Crystal Radio Works\r
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Crystal Radio Troubleshooting and Tips\r
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Make Crystal Earphone/Earpiece for Crystal Radio\r
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Use Earbuds/Earphones with Crystal Radio\r
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Make a Crystal Radio Coil with Taps\r
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Make Razor Blade Diode for Crystal Radio/Foxhole Radio\r
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How to Make Crystal Radio Amplifier for Speaker\r
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How to Make Amplifier for Crystal Radio Earphone\r
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Steps for How to Make Amplifier for Crystal Earpiece\r
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How to Make an AM Radio Transmitter (so you can transmit to your crystal radio)\r
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Amplitude Modulation with Simple AM Radio Transmitter\r
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Follow me on Twitter:\r
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I originally got this circuit from the book Radio Receiver Projects You Can Build by Homer L. Davidson.\r
\r
For this circuit, the diode must be germanium. The following is a partial list of germanium diodes that should work:\r
1N34A, 1N60, 1N91, 1N119, 1N270, 1N277, 1N283\r
\r
The following are not germanium diodes and may need a long antenna or a powerful radio station nearby to work:\r
1N4148 (silicon, found on a lot of circuit boards), B16 (zener diode), 1N5060 (avalanche diode)\r
\r
The crystal earpiece (piezoelectric earphone) and/or 1N34 germanium diode and/or air core variable capacitors can be ordered from most of these sources:\r
\r
(their variable capacitor is for if your coil has a ferrite core and is smaller than the one in this video)\r
\r
\r
You can find the circuit diagram shown in this video on this page:\r
\r
\r
See also:\r
\r
How a Crystal Radio Works\r
\r
\r
Crystal Radio Troubleshooting and Tips\r
\r
\r
Make Crystal Earphone/Earpiece for Crystal Radio\r
\r
\r
Use Earbuds/Earphones with Crystal Radio\r
\r
\r
Make a Crystal Radio Coil with Taps\r
\r
\r
Make Razor Blade Diode for Crystal Radio/Foxhole Radio\r
\r
\r
How to Make Crystal Radio Amplifier for Speaker\r
\r
\r
How to Make Amplifier for Crystal Radio Earphone\r
\r
\r
Steps for How to Make Amplifier for Crystal Earpiece\r
\r
\r
How to Make an AM Radio Transmitter (so you can transmit to your crystal radio)\r
\r
\r
Amplitude Modulation with Simple AM Radio Transmitter\r
\r
\r
Follow me on Twitter:\r
\r
\r
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