DIY simple metal detector

Simple metal detectors with different nature, which means it can distinguish between black metals and non-ferrous metals. Hardware component General transistor PNP × 2 Resistance 10K ohm × 1 Resistance 100 ohm × 1 Capacitor 100 nf × 1 Search Coil × 1 Capacitor 220NF × 1 Mobile phone × 1 Manual tools and manufacturing machines Soldering iron (general) The above apparatus is a simple metal detector with identification characteristics, which means it can distinguish between iron-containing materials and non-ferrous metallic materials. Be It is very easy to build, including only some components Two PNP transistors Two resistors Two capacitors Search coil And Android smartphone Simplicity is due to the use of smartphones, it can process the signal and display the result on the screen. Let me mention that this is another excellent project of the "NECO-DESARROLLO.ES" website where you can download the Android app. A signal having a specific frequency defined by the input LC circuit is inserted into the microphone input of the smartphone. When the coil is near the metal object, the oscillation frequency changes, and is displayed as detected metal on the screen. The detection coil consists of 90 to 120 insulating copper wire windings, and the wound diameter is 8 to 10 cm. By replacing the capacitor C2, the oscillation frequency of the LC circuit will also change, the frequency should be around 9-12 kHz. In my case, the value of C2 is 67nf. Determine the value of C2 by experiment depending on the number of turns and coil diameters. In this case, the purpose is to demonstrate the ability to distinguish between different metals. However, it is concluded that although the manufacture of such a metal detector is extremely simple, it has a relatively good function, and small coins can be detected at a distance of 5 cm.

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