Tuesday, 17 May 2011

Building a radio in 10 minutes.


For our 10 minute radio, we will need these parts:

  • A ferrite loop antenna coil

    In our other crystal radios we wound the coil by hand. In this project we use a much smaller coil with a ferrite rod inside, from our catalog. The ferrite rod allows the coil to be smaller, and it can be moved in and out of the coil for coarse tuning.

  • A variable capacitor (30 to 160 picofarads)

    We carry this in our catalog. You can also find them in old broken or discarded radios.

  • A Germanium diode (1N34A)

    We carry this in our catalog.

  • A piezoelectric earphone

    Also in our catalog.

  • Two alligator jumper wires

    We use alligator jumper wires here for convenience. They are used to connect the ground and antenna wires to a good ground and a long wire antenna. We carry these in our catalog.

  • About 50 to 100 feet of stranded insulated wire for an antenna.

    This is actually optional, since you can use a TV antenna or FM radio antenna by connecting our radio to one of the lead-in wires. But it's fun to throw your own wire up over a tree or on top of a house, and it makes the radio a little more portable.

  • A block of wood or something similar for a base

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