How to make a portable crystal radio using a loop antenna coil and all inside a pizza box. No ground connection or long antenna needed. I go step-by-step into how to make this portable crystal radio. The coil that the tuning/variable capacitor resonates doubles as the antenna by being a very long and large coil. Radio stations are tuned into by adjusting the tuning capacitor and pointing the face of the loop at a nearby radio station. If you don't know where the radio station is, the rotate the coil until something is found.

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 can be orders from these sources:
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Here's my webpage about this pizza box crystal radio:
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For how to make a homemade crystal earpiece similar the one used in this video, watch
"Make Crystal Earphone/Earpiece for Crystal Radio - Homemade":
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For "Crystal Radio Troubleshooting and Tips", watch:
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For "How a Rocket Works/Earth to Space Eg SpaceX Falcon 9 and Dragon", watch:
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To see how this crystal radio being played on a speaker using a homemade amplifier, see "How to Make Crystal Radio Amplifier for Speaker":
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And for how to make a more common, tunable crystal radio, watch "How to Make/Build a Crystal Radio":
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And to see how a crystal radio works, watch "How a Crystal Radio Works":
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To follow me on Twitter:
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Music used throughout:
The Path of the Goblin King Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
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ISRC: USUAN1100873

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