![]() They are also used for different hobbies such as beachcombing, coin shooting, prospecting for valuable metals such as gold and silver.Industrial metal detectors serve in places such as food, beverage, textile, garment, chemicals, pharmaceutical, lumber, plastics, and packaging industries.They serve for a number of purposes such as security screening, checking the accidental presence of undesirable metallic pieces in food products.2N2222A has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. Metal detectors are in locations such as airports, government agencies, office buildings, schools, and prisons to prevent anyone from carrying a weapon into the premises. 2N2222A is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin.BC458 is a general-purpose NPN transistor used in many electronics projects and devices. The circuit power supply should be a 9V or 6V Battery. BC548 transistor Pinout, Specifications, Datasheet and Applications. L1 is equal to 60 turns of enameled copper wire wound on a 1cm PVC tube. Compare Product Add To Project Add Notes Availability Stock: Not Available Possible Replacement No Image Mfr. ![]() Now when you place this metal detector circuit near any metal object you will hear a hissing sound from your AM radio, signaling the detection of a metallic object. Description: Bipolar Transistors - BJT NPN 30V 100mA HFE/8 Lifecycle: Obsolete Datasheet: BC548 Datasheet (PDF) ECAD Model: Download the free Library Loader to convert this file for your ECAD Tool. In this condition, the radio and the circuit will be in the same frequency and the same frequencies beat off to produce no sound. This is just a Colpitts oscillator working in the medium band frequency with a radio to the same frequency.įirst, the radio and the circuit are put close, then the radio is tuned so that there is no sound from the radio. Using a 1,000 F caK1 - + LM324 2.2 k 1N914 + 6/ 12V BC548 Sensor 1 to 10 M 100 k to 1 M 100 k () See Fig. ![]() The above circuit diagram is of a low-cost metal detector using a single BC548 transistor and an old radio. ![]()
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