HOW TO: Build a Bottle (Crystal) Radio [Video]


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This simple video will teach you on how you can build a bottle radio, which requires no external power source and will let you hear nearby radio transmissions.

Crystal radio technology has been around for many years. This “bottle radio” take on a crystal radio requires no power source, operates on the power from radio waves, and receives signal from a long wire antenna. As radio stations slowly move away from the AM band, the “window of opportunity” to experience this remarkable technology is dwindling. The “crystal” in question is contained inside a germanium diode, and is used to rectify the radio signal so that our ears can hear it.

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One Response to HOW TO: Build a Bottle (Crystal) Radio [Video]

  1. They left out two critical bits. 1) be very careful when sanding off the enamel insulation on the coil. You just want to barely expose the copper wire. If you sand too hard, you run the risk of creating tiny copper shards that will short out the coil. Clean the coil after sanding by gently brushing it with a paint brush or tooth brush; 2) most wire coat hangers are coated with enamel or some other type of coating to prevent them from rusting. Use the sand paper to remove the coating and expose the bare metal at the loop end, at the point where the capacitor is attached, and at the point where the coat hanger contacts the coil.