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Metal Detector Circuits
Metal Detector Circuits
An NE602 acts as a heterodyne detector and Ql as a sense oscillator. When Ll is brought near metal, it causes a charge in lo
Metal locator circuit
The search coil, CI and C2 form a tuned circuit for the oscillator which is tuned near the center of the broadcast band. Tune a portable radio to a station near the middle of the band, then tune C2 until a squeal is heard as the two signals mix to produce a beat (heterodyne) note. Metal near the search coil will detune the circuit slightly, changing the pitch of the squeal.
AM metal detector
The metal locator uses a one-transistor oscillator and an AM radio to detect metal. Transistor Q1 is a pnp transistor that is connected to an oscillator. Resistor R1 provides the correct base bias and capacitors C3 and 04 and the search coil determine the frequency of oscillation. Capacitors C3 and 04 are fixed in value, but the search coil is an inductor that varies in inductance (and thus...
Using an oscillator running at 455 kHz, the metal-detector circuit produces an indication on the meter Ml. When the oscillat
Metal Pipe Detector Circuit
This circuit uses a 15-kHz oscillator coil. When metal placed in the energy field is withdrawn, the oscillator voltage is rectified and compared to a reference.
Metallic pipe detector
This circuit uses a 15-kHz oscillator coil. Whan metal placed ixi the energy field is withdrawn, the oscillator voltage is rectified and compared to a reference. A drop in oscillator voltage therefore operates comparator IC2 and D4 (LED) extinguishes.
Double oscillator metal detector
The circuit consists of two oscillators, both working at about 465 kHz. One uses an if transformer and the other uses an inductor (the search coil LI). The oscillators are coupled by a capacitor (10 pF). A beat note (produced if the two oscillators are working closely together) is detected by the diode and fed to the headphone amplifier and the 22 ?F capacitor. The search coil oscillator is...
Minimal metal detector
This circuit is on oscillator with LI being a 4" diameter coil of 35 turns of #26 magnet wire. Metal in proximity to LI will cause the oscillator to shift frequency. An AM transistor radio is used to detect the frequency shift.
Metal Detector circuit with TDA2822
Here is a simple metal detector with TDA2822 and few NPN transistors. There is a small arrow connected from the Emitter of the T3 to the 10n Capacitor C4. That arrow is simply indicating signal flow as right to left in that particular wire, which is different from the remaining circuit's left to right.
Metal detector with 4030 CMOS
This battery-powered metal detector uses four exclusive-OR gates contained in the 4030 CMOS integrated circuit. The gates are wired as a twin-oscillators and a search coil serves as the inductance element in one of the oscillators. When the coil is brought near metal, the resultant change in its effective inductance changes the oscillator's frequency. Gates A1 and A2 form the two oscillators...
1 transistor treasure locator circuit
Locator uses a transistor radio as the de-tector. With the radio tuned to a weak station, adjust Cl so the locator oscillator beats against the received signal. When the search head pasÂ¬ses over metal, the inductance of LI changes thereby changing the locator oscillator's freÂ¬quency and changing the beat tone in the radio. The search coil consists of 18 turns of #22 enameled wire scramble...
Metal Locator Circuit
The metal locator uses a one-transistor oscillator and an AM radio to detect metal. Transistor Ql is a pnp transistor that is connected to an oscillator. Resistor Rl provides the correct base bias and capacitors C3 and 04 and the search coil determine the frequency of oscillation. Capacitors C3 and C4 are fixed in value, but the search coil is an inductor that varies in inductance (and thus...
metal sensor detector circuit schematic
The metal detector circuit is shown here that the limits represent the sake of simplicity for a metal detector, but the design works remarkably well. It only uses 40, 106 Hex Schmitt inverter IC, a capacitor and a search coil and of course batteries. An advantage of IC1b Pin 4 is to be connected to a medium-wave radio antenna, or it should be w
Surfmaster PI Metal Detector Schematic Diagram
If TIP32C (Q2) gets excessively hot, use an IRF9640 MOSFET instead. Experiment with different values for R6 to find the optimal value (I use a 390 ohm resistor). Temporarily substitute R6 for a trim potentiometer (470 or 1k) to find the optimal dumping resistor for your coil.
Metal detector circuit diagram 3
The metal detector is composed of the probe oscillator, reference oscillator and audio amplifier and other components, and the circuit is shown as the chart. Probe oscillator consists of transistors VI, V2 and detection coil L1, capacitor C1 and so on. Reference oscillator consists of transistors VI, Y3 and inductor L2, capacitor C3 and other comp
Metal Detectors and Sensors Circuits
TDA0161 metal detector electronic schematic
This metal detector circuit diagram is based on the TDA0161 monolithic integrated circuit, designed for metallic body detection by detecting the variations in high frequency Eddy current losses. Output signal is determined by supply current changes. Independent of supply voltage, this current is high or low according to the presence or the absenc
BASIC CIRCUITRY of Metal Detection
The search loop may be constructed in several different ways; however, the method offered here should get you headed in the right direction. Refer to Fig. 2 as a guide for constructing the loop. The loop form should be constructed from non-metallic and non-moisture-absorbent material. A sealed wood form will do, and it can be either solid or hoop-
555 metal detector
ib metal detector
Beat Balance Metal Detector
Homemade metal detector circuit
This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability. It is not suitable for bu..
555 metal detector
Whites Classic I metal detector schematic diagram
The White`s Classic I was a very simple, easy to use machine, ideal for the entry-level detectorist to pick-up-and-go. It was a simple detector with no bells or whistles, only an on/off switch and a turn knob for a discriminator. It did not have much depth but it did find coins, jewelry and relics in the hand of a skilled hobbyist. While the Class
A Simple Metal Detector Circuit Using Beat Frequency Oscillator (BFO)
One of the simplest method of metal detecting is by beat frequency oscillator. Basically, the circuit consist of two balanced oscillator. One oscillator provides the reference signal, and other oscillator is acting as the detector element. The reference oscillator`s frequency is fix, while the detector oscillator is variable depending on the prese
bfo metal detector circuit
simple metal detector
Assemble the circuit on a perfboard or pcb except the inductor. Attach two long wires at the place of the inductor. Use a long rod and place the induc..
Metal detector with meter discriminating
The Metal Detector Circuit
This design has not been called a GOLD detector as this name has been left for the more complex detectors that actually discriminate been gold and other metals. There is an enormous difference between detecting gold and ordinary metals (called base metals). How the detector work The circuit is an oscillator and the way it keeps oscillating is due
Metal Detector MkII
This project is an extension of Metal Detector MkI, and shows how metal objects are detected. It is the second in a series of circuits and allows a great deal of experimentation, especially if you have a CRO (Cathode Ray Oscilloscope) and a few items to detect. You can view the waveforms and see exactly how they alter as an object is brought into
Metal detector with 555 timer
This metal detector electronic project schematic circuit is designed using a simple 555 timer integrated circuit. As you can see in the schematic circuit, this metal detector electronic project requires few external electronic parts.
How to Make a Simple Metal Detector Circuit Using IC CS209A
The principle of operation of the proposed metal detector circuit is quite basic yet very interesting. The detecting function is triggered by sensing the decrease in the Q level of the LC network associated with the circuit in the presence of a metal at a specified proximity level. Basically the built-in oscillator of the IC CS209 is made function
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