How to assemble a metal detectorMetal detectors are used to search for metal in the soil at a certain depth. This device can be assembled independently at home, with at least minimal experience in this business, or following clear instructions. The main thing - the desire and availability of the necessary tools.


  • 1 Detailed instructions metal detector terminator 3 do it yourself
    • 1.1 Parts list for metal detector terminator 3
  • 2 Metal Detector Circuit with Metal Discrimination
    • 2.1 Metal detector do it yourself without microcircuits
  • 3 Coil for metal detector terminator 3
    • 3.1 Repair coil metal detector
  • 4 Printed circuit board for device terminator 3
  • 5 Sensor for metal detector do it yourself
  • 6 Terminator metal detector 3: reviews
  • 7 Metal Detector Soha 3: scheme and description

Detailed instructions metal detector terminator 3 do it yourself

This type of construction is designed to search for coins. The process of assembly is quite simple. However, experience in assembling such a tool is still necessary. The terminator is able to detect the subject, even if the capture target is minimal.

For beginnings should prepare the necessary equipment, namely:

  • multimeter that measures speed.
  • LC meter.
  • Oscilloscope.

Next, you need to find a scheme with a breakdown into nodes. Now you can make a printed circuit board, which should be soldered in order jumpers, resistors, panels for chips and other details. The next step is flushing the board with alcohol.. Be sure to check for defects. In working condition, the board can be checked as follows:

  1. Turn on the power.
  2. Unscrew the sensitivity knob before the sound is heard in the speaker.
  3. Touch the sensor connector with your fingers.
  4. When turned on, the LED should blink and then go out.

Assembling a homemade metal detector If all actions have occurred, then everything is done correctly. Now you can make a coil. It is necessary to prepare a wrapping enamel 0.4 mm in diameter, which must be folded in half. On a sheet of plywood is drawn a circle having a diameter of 200 mm and 100 mm. Now in a circle it is necessary to drive in nails, the distance between them should be 1 cm.

Then you can go to the winding turns. At 200 mm should make them 30, and at 100 - 48. Then the first coil should be soaked with varnish, when it dries, you can wrap a thread. The thread can be removed, and, having soldered the middle, you get a solid winding of 60 turns. After the coil must be wrapped with tape pretty tight. And the foil in the size of 1 cm is laid on top, it will be a screen, and electrical tape is also wound on top of it. The ends should go outside.

On the second coil also need to solder the middle. In order to start the generator, it is necessary to connect the first coil to the board. The second coil should be wound with a wire of 20 turns, then connect it to the board. Now you need to connect the oscilloscope minus-minus to the board, and the plus connects to the coil. Be sure to see what frequency will be when you turn on and memorize it or fix on paper.

Now you need to put the coils in a special form, then to fill them with resin. Next, the oscilloscope is connected to the board, the negative pole, the amplitude should reach zero. The coils in the mold are filled with resin at about half the depth. When everything is ready, setting the scale of discrimination of metals is carried out.

Parts list for metal detector terminator 3

As parts for the metal detector, the trio will need:

  • Metal detector assemblyMetal capacitors;
  • SMD resistors;
  • Microcircuits;
  • Transistors;
  • Diodes.

If you have these parts, you can assemble the metal detector terminator pro yourself.

Metal Detector Circuit with Metal Discrimination

How to assemble a metal detector with your own handsMetal detector with the discrimination of metals with their own hands can be done using the scheme for a pulse device Chance. The manufacturing process of the coil is quite simple.

The scheme itself can be found on the Internet. But nevertheless experience in the assembly of such devices will be useful. Assembling the metal detector should start with the board.

After the board is made, it is necessary to flash the microcontroller. And at the end of the work, we connect to the power supply a metal detection device.

However, in order for the equipment to work, a coil is required. Best of all, if it is with a low parasitic capacitance. Winding enameled wire is wound on a coil. And then it can be connected and check the performance of the metal detector. It is necessary for him to make the body and the bar. And you can get to work.

Metal detector do it yourself without microcircuits

Self-made equipment can be made without complex chips, and using a simple transistor generator. Metal detector will be without discrimination. Objects he will detect in the ground at 20 centimeters in depth, and in dry sand - at 30 centimeters. In this unit, the transmitting and receiving coils work simultaneously.

Coil for metal detector terminator 3

Principle of the deviceTo start, you should take the winding enamel, having a diameter of 0.4 mm. Fold it so that there are two ends and two beginnings. Further it is worth winding from two coils in time.

Now you need to make the transmitting and receiving coils, for this, two circles of 200 mm and 100 mm are drawn on the plywood sheet. According to the circles, the carnations are driven in, the distance between them should be 1 cm. On the large mandrel wound 30 turns enameled. Then you should apply varnish on the coil and wind off with a thread, then removing from the winding, solder the middle part. So it turns out one medium and two extreme wires.

The resulting coil should be wrapped with tape and put on top of a piece of foil, and on top again foil. The ends of the windings should go outside.

Now it is necessary to go to the receiving coil. Here 48 turns are already wound. To start the generator you need to connect the transmitting coil to the board. The middle wire connects to the negative. And at the receiving coil the average output is not used. For a transmitting coil, a compensating one is needed, on which 20 turns coil.

Design features of the metal detectorWe connect the oscilloscope to the board like this: a probe with a minus to the minus of the board, and a positive probe to the coil. Be sure to measure the frequency of the coils and record it.

After connecting the coils according to the scheme, they must be placed in a special container and filled with resin. Now on the oscilloscope is set the time of division (10 ms and 1 volt per cell). Now it is necessary to reduce the amplitude to zero. We wind the coils until the value of the volt reaches zero. We make a compensating loop at the coil, which will be outside.

Half mold should be spilled with resin. When everything hardens, you need to connect the oscilloscope and bend the loop inward. Then twist it until the amplitude value becomes minimal. After the loop must be glued, check the balance, and now you can pour resin with the second half of the container. The coil is ready to go.

Repair coil metal detector

Before proceeding with the repair, you should prepare the following tools:

  • Clerical knife;
  • Incandescent lamp;
  • Capacity for glue, preferably flat;
  • Special or epoxy resin;
  • Middle and small emery;
  • A small spatula.

How to use a metal detectorThe first step is to dry the coil with an incandescent lamp. And with the help of a clerical knife widen cracks in it. Squeeze the glue on a flat surface and mix with a spatula. Apply this substance to the coil. In places of cracks can be applied more resin. Now it is worth waiting until it all carefully hardens. And then process it with emery, using medium first and then fine. This procedure will help smooth out all the bumps. In this rather simple way, you can reanimate the oldest coil from the device to search for metal.

Printed circuit board for device terminator 3

How to assemble a metal detector according to drawingsA printed circuit board for this type of equipment can be manufactured and configured independently. The circuit board for Terminator 3 is on the Internet. After it is found, you can proceed to the manufacture of printed circuit boards. After that jumpers, smd resistors and panels for chips are soldered into it. Capacitors in the board must have a high thermal stability.

Next, the circuit board is washed with alcohol. Be sure to dry, and in the presence of defects eliminate them. Simple and reliable board ready.

Sensor for metal detector do it yourself

Before you begin, you must prepare the device, which will accurately measure the capacity and inductivity. Now you should take the body for the coil and make inserts from the PCB in the ears. Used to seal pieces of cloth. The upper surface of the lugs should be sanded. Fabric must be impregnated with epoxy resin. When everything is dry, it is necessary to grind everything and insert a pressure seal, thus making grounding. Next, you need to apply a special varnish Dragon.

Now windings are made, which are tied with thread. All windings are put in a coil and glue capacitors. You can connect and customize everything. To fill required housing. Required: metal should not be near. After pouring, the epoxy must be sanded and dried thoroughly. The sensor is suitable for metal detector terminator 3 and terminator 4, which are the most popular models of devices.

Terminator metal detector 3: reviews

Many consider this model of the device popular. In the quality of positive qualities distinguish:

  • Finding objects from non-ferrous metal.
  • No false positives.

And as negative traits emit:

  • Rusty iron is pretty bad.
  • You can lose some of the finds.

The depth of search for the device is higher than that of other similar models. Basically it is 30 centimeters on the example of a coin.

Metal Detector Soha 3: scheme and description

The advantages of a homemade metal detectorMetal detector has from 5 to 17 kHz operating frequency. Power it is 12 volts. The balance of the soil is manual.

The scheme of this device is not quite simple, since it contains two microcontrollers. The scheme can be found on the Internet. The device itself has good characteristics. However, due to the lack of detailed assembly information, it may be difficult to manufacture the device.