Building a crystal radio out of household items | Science Toys
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HOT 20MΩ Crystal Radio Earphone Earbud with Cable and Connector | eBay
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Philmore Crystal Radio Earphone to Stripped and Tinned Bare Wire, 7-Ft Cord, High Impedance 748 - Walmart.com
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Vintage Planatair Germanium Crystal Radio, No. 76404, Planatair - World's Smallest Radio, Earphone Listening Only, Made In Japan, Circa 1965 | Small radio, Small world, Radio
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Crystal Radio Set Receiver Inductor Antenna Coil Detector Piezo Earphone Red | eBay
Earphone For Crystal Radios, Monaural Earphone Amplifies Low-Level Audio Signals - Walmart.com
Piezo buzzer modified to make it work as a crystal earphone. | Crystals, Earpiece, Earphone
Learning Electronics — 2. Fun with Crystal Radio and Extensions « RAYSHOBBY.NET
