Metal detector circuit diagram

Metal detector circuit diagram In the category Metal Detectors Videos more articles and learn more information about Metal detector circuit diagram Reviews Price Specifications Features Image manuals videos Accessories All this in metal detectors for gold.

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Metal detector circuit diagram,The metal detector is a relatively simple device, an electronic circuit that provides good sensitivity and stability. A distinctive feature of this device is the low operating frequency. Metal detector coil operates at a frequency of 3 kHz.

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It provides, on the one hand, and poor response to unwanted signals (such as signals that occur in the presence of wet sand, and small pieces of metal, etc.), on the other hand, good sensitivity when looking for water pipes hidden and manages central heating, coins and other metal objects.

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The birth of metal detector coil is fluctuations in transport at a frequency of about 3 kHz, making the magnetic field rotates. Receiver coil is perpendicular to the coil refers to going through the magnetic field lines create a EMF. Received signal output coil either absent or very small. Metallic object entering the coil field, change the value of the inductor and output an electrical signal, which is then amplified, rectified and filtered. Thus, the output signal of a system is an ongoing effort which a little when approaching a coil of metal body increases the value. This signal is fed into one entry from the comparison, and are compared with the reference voltage that is applied to the input of the second. Voltage signal level adjusted so that even a slight increase in the reference voltage to change the State of the output of the comparator. This in turn lead to electronic switches, which led to the amplifier output stage has a warning to inform the operator of a metal object.

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Design electronic pulse metal detector circuit

Metal Detector Circuit

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Metal Detector Circuit Diagram

The metal detector is commonly used in electronic component world and it is operation circuit is based on super heterodyning principle .

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Looking for a simple but effective metal detector circuit for coins, jewelry, and more?

The second integration makes the “saw” signal is coming very close to sinusoidal in shape and consists of a parabolic half wave. This stable signal going to the power amplifier, a conversion of the current effort, “and loaded on the sensor coil.

Sensor voltage is not stable capacitance and signal reflected from metal objects. The absolute value of this instability is very small. To increase it, which distinguishes a useful signal, the compensation service and integration II output voltage of the voltage across the sensor coil.

How does a metal detector circuit work?


A metal detector circuit is a relatively simple electronic circuit that is designed to detect the presence of metal objects. Here’s a basic explanation of how a typical metal detector circuit works:


The heart of the metal detector circuit is an oscillator. The oscillator generates a continuous wave of radio frequency (RF) energy.


The metal detector contains one or more coils of wire, typically wound in a coil shape. These coils are part of the metal detector’s search or sensing system.

Transmitter Coil:

In a typical metal detector, there are usually two coils: a transmitter coil and a receiver coil. The transmitter coil is connected to the oscillator and is responsible for generating the RF signal.

Magnetic Field:

When the RF signal flows through the transmitter coil, it creates an electromagnetic field around the coil. This field extends into the surrounding space.

Eddy Currents:

When the electromagnetic field encounters a conductive metal object, such as a piece of metal in the ground, it induces eddy currents (circulating currents) in the metal.

Eddy Currents Create a Secondary Magnetic Field:

The eddy currents induced in the metal create their own magnetic field. This secondary magnetic field interacts with the primary field produced by the transmitter coil.

Receiver Coil:

The receiver coil, which is also located in the metal detector’s search head, is designed to pick up changes in the magnetic field caused by the presence of metal. This coil is connected to a separate circuit that processes the received signals.

Signal Processing:

The signal from the receiver coil is processed by a circuit that analyzes changes in the amplitude and frequency of the received signal. When a metal object is present, it disturbs the magnetic field, causing detectable changes in the received signal.

Audio or Visual Output:

When the metal detector circuit detects a metal object, it typically produces an audible tone or a visual indicator (such as a flashing light). The user is alerted to the presence of metal.

The key principle behind metal detection is the disturbance of electromagnetic fields by conductive metal objects. Different metal objects can produce different responses, allowing metal detectors to discriminate between various types of metals.

It’s important to note that this is a simplified explanation, and the actual circuitry in a metal detector can vary depending on the type and complexity of the detector. Advanced metal detectors may include additional features like discrimination settings, ground balance controls, and digital signal processing to enhance performance and accuracy.