Here is a site with a DIY Metal Detector. This is a BFO, or beat frequency oscillator. This metal detector has a coil in the probe, and another in the control box. The two oscillate out of sync with each other, and you can hear a beep coming out of the speaker. When the larger coil is brought close to metal, it changes the oscillations, and changes the beep on the speaker. This seems like a pretty easy project. I would love to build one of these. I go home to sometimes to study for tests, and I take breaks by shooting bows with my dad. I am always losing the arrows because I shoot too high. If I had this, I could easily find the arrows in the grass.
“BFO ( beat frequency oscillator ) metal detectors use two oscillators, each of which produces a radio frequency. One of these oscillators uses a coil of wire that we call the search loop. The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the reference oscillator. By adjusting the oscillators so their frequencies are very nearly the same, the difference between them is made audible as a beat note, this beat note changes slightly when the search loop is moved over or near to a piece of metal.”
3 Responses to “DIY Metal Detector”
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I had never heard of a theremin before. It seems like an amazing instrument.
I am in a real need of a metal detector project…i thought if the sender eleborates the topic more practically and send me some easy steps to make it….the oscilaator it self is a ??? i dont know plz help! i am a student of electrical eng…need to use this in my first proj…and i am a quick learner!
do tell me more plz at my pail qaasim@gmail.com
yo dude!! thats sooo gr8!! it seems that…. I made a comment in an ancient site….. jk!
yo listen, my lil bro hides some stuff from me, like my cell!! so i thought I would put a metal in, my cell (if it doesn’t already have one :P) then use ur metal detector!! so can u gimmie instructions and easy-to-get requirements…. again plzzzz! thnx in advanced..