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Turn a oneradio7/29/2023 ![]() The nearby signal overwhelms everything else by a factor of millions. Your wire antenna is receiving all sorts of radio signals, but because you are so close to a particular transmitter it doesn't really matter. ![]() Now if you put the earplug in your ear, you will hear the radio station - that is the simplest possible radio receiver! This super-simple project will not work if you are very far from the station, but it does demonstrate how simple a radio receiver can be. Connect the two leads from the earplug to either end of the diode, like this:.Lay it out on the ground, or hang it in a tree, but make sure the bare end does not touch the ground. Take another piece of wire, 10 to 20 feet long (3 to 6 meters), and connect one end of it to the other end of the diode.Attach the diode to the other end of the ground wire.Strip the insulation off the end of a 10-foot (3-meter) piece of wire and wrap it around the stake/post five or 10 times to get a good solid connection. Drive the stake into the ground, or find a convenient metal fence post.A diode allows current to flow through in one direction but not the other, so it clips off one side of the wave, like this: In the case of an AM radio, the detector is made with an electronic component called a diode. This is done with a part of the radio called a detector or demodulator. Now the radio has to extract the DJ's voice out of that sine wave. The tuner causes the radio to receive just one sine wave frequency (in this case, 680,000 hertz).It is easy to create a resonator with a capacitor and an inductor (check out How Oscillators Work to see how inductors and capacitors work together to create a tuner). That is, tuners resonate at, and amplify, one particular frequency and ignore all the other frequencies in the air. Tuners work using a principle called resonance. ![]() ![]() In this case, the tuner is tuned to receive the 680,000-hertz signal. The job of a tuner is to separate one sine wave from the thousands of radio signals that the antenna receives. The antenna will receive thousands of sine waves. An AM antenna is simply a wire or a metal stick that increases the amount of metal the transmitter's waves can interact with.
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