Construction Of Metal Detector

ABSTRACTMetal detectors are electronics sensors that indicate the presence of metallic object without making physical contact with object. They are effective and useful security tools employed in strategic places such as airport, bank, stadiums, government houses and also in production industries to detect presence of metallic object on person luaggages, consignments foods, drugs garments etc. The study present a metal detector comprising a radio frequency oscillator, demodulating unit, triggering unit and output unit. A transistor colpit oscillator is used with its inductor being a toroidal c…