heard this on the radio but didn't catch the details.
any info would be great. looking for simple science projects for kids using stuff around the house
2006-11-15 03:49:37 · 4 answers · asked by ♪ ♫ ☮ NYbron ☮ ♪ ♫ 6 in Science & Mathematics ➔ Physics
This sounds like an urban legend. Modern metal detectors use an oscillator to produce an alternating current which flows through a large multiturn coil in the bottom of the detector. This coil produces a magnetic field which causes current flow through induction in nearby metal. A second coil detects the magnetic field in the nearby metal (induction again) is amplified and drives a detector circuit.
If you had a very crumby AM radio from the 1920's, it would probably detune the station you were listening to if you got near a car but I don't see how the parts you describe could work.
2006-11-15 04:05:03 · answer #1 · answered by Gene 7 · 0⤊ 0⤋
Metal Detector Coil Calculator
2016-11-06 20:24:47 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Like said above, you need an oscillator, a coil, and pick-up coil, an amplifier and a speaker. The radio has the the speaker, the amplifier circuit, and even the oscillator (in the tuning mechanism, which is probably a frequency down-mixer). I'm not sure why you need the calculator. The CD case might have an RFID tag which is a kind of coil antenna... but you still need a wire to make a transmitter coil. And I have no idea of the details.
2006-11-15 04:35:43 · answer #3 · answered by Enrique C 3 · 0⤊ 0⤋
A compass would probably work just as well.
2006-11-15 04:15:44 · answer #4 · answered by Roman Soldier 5 · 0⤊ 0⤋