Un PLL interno de IC1 compara ambas frecuencias. El chip IC1 incluye otro oscilador, controlado por tensión (VCO), cuya frecuencia central se ajusta mediante P1. La bobina detectora L1 forma parte de un oscilador sinusoidal realizado en torno al transistor T1. No es adecuado para la búsqueda de monedas enterradas ya que no es lo suficientemente sensible, ¡pero puede detectar tesoros piratas!Įl detector de metales es alimentado por 2 pilas de 9V, consumiendo 15 mA de cada una de ellas. Related metal detector circuitsĭetector de metales de realización casera.Įste circuito detector de metales de realización casera le ayudará a encontrar objetos realizados con materiales con permeabilidad magnética relativamente alta. Since the neutral zero setting “runs” with the battery’s decreasing voltage it will be necessary to restore it (zero balancing) from time to time during use of the homemade metal detector. Then, adjust P2 in order to obtain 0 on the meter. Adjust P1 so that fronts rectangular signal from pin 4 to coincide with the peaks of the sinusoidal signal from pin 2. Use an oscilloscope to check that pin 2 of IC1 delivers sinusoidal signal with frequency about 75 kHz. Inductance thus obtained ensure the functioning of the oscillator at a frequency approximately equal to the VCO included in the PLL loop. The meter tool used for this homemade metal detector is zero as central, +-50♚.Ĭoil L1 consists of 40 turns of enamelled copper wire, wound on a plastic template with a diameter of about 10 cm. Meter needle deviation is a measure of frequency change, since the direction of deviation depends on the type of material detected by the coil. This changes when entering a metallic object (ferrous or nonferrous) in the field induced by L1. Normally, the center frequency of the voltage controlled oscillator (VCO) from the PLL loop that is contained in IC1 is equal to the oscillation frequency of T1. L1 detector coil is part of the sinusoidal oscillator built around transistor T1. The metal detector is powered by 2 x 9V batteries, each of it charges with 15 mA. ![]() ![]() It is not suitable for buried coins discovery that is not sensitive enough but you can detect pirates treasures! This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability.
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