Crystal Radio

[co2isgoodal]

I like building crystal radios.

I make my own detectors from iron pyrites and razorblades. I've heard stations 300 miles away with a razorblade detector, variable condenser, homemade coil and a piezo earphone.

Last night I heard a local station using an old penny as a detector. It wasn't nearly as loud as the razor.

[AcePilot101]

A crystal radio does not use batteries, it draws electric power from the radio signal.

In theory, a Tesla generator draws electric power from the sun by connecting a circuit between the ionosphere (magnetosphere) and the earth.

Remember light is just the visible spectrum of electromagnetism.

[knightlbr]

Cool. But it's basic of electronics.

[JavBerri]

how do yo do that? I can't do it!

[kreeddem]

Thats cool!