![]() ![]() Not only can this build detect metal, but it can discriminate between different types of metal. The circuit is fed directly into the headphone jack on the smartphone and can be calibrated and used from within an Android app. Normally there would be an audible alert as the frequencies of the circuit change when in the presence of metal, but this one uses a smartphone to analyze the frequency information instead. The unique part of this build, though, is how the detector alerts the user to a piece of metal. Like other metal detectors, this one uses two coils of wire with an oscillator circuit and some transistors. There are all kinds of ways to send signals through coiled wire to detect metal objects in the ground, and today is demonstrating a new method he is experimenting with which uses a smartphone to detect the frequency changes generated by the metal detector. Is quite a wizard when it comes to using coils of wires in projects, especially when their application is within easy-to-build metal detectors. ![]()
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