The metal detector is verya specific and unusual tool that may not be necessary for every person. Despite its uniqueness, the metal detector is a dream for many people.
Most people try to buy such equipment, but you can do it yourself. Detailed instructions of the metal detector 'Terminator 3' and the scheme are offered by many specialized forums. Look for this information in this article. Metal detector 'Terminator 3' This model of a metal detector is considered by many to be one of the most popular.
The developers of the device are users of one of the forums on the Internet. It is worth noting immediately what to assemble with your own handsThe metal detector will be very difficult for those who have never been interested in such equipment before. It will be really difficult to do this kind of work, but do not be scared: just carefully prepare for the process and collect all the necessary details and elements. Depth of detection The search for a metal detector of coins and other items can be carried out at different depths: • Five rubles - 22-24 cm. • Catherine's heel - 27-30 cm. • The helmet is about 80 cm. • A beer can is a meter or more. 
All of the above parameters are calculated for sensorswith 240 mm on the wire and chernozem soil. Separately it is worth mentioning the discrimination of the metal detector 'Terminator 3' by many users, which is completely unfair: unlike its analogues, which can determine only the depth of occurrence of an object, this model determines the metal from which the object is made. Assembling a metal detector To assemble and adjust the metal detector you will need the following equipment: • Oscilloscope. • The multimeter. • Frequency meter. When you purchase the entire set formetal detector will have to pay a tidy sum. To save money, many users prefer to limit themselves to a virtual measuring system based on a personal computer.
Find suitable software designed for such purposes, you can on the Internet. Metal Detector Scheme By its design, the metal detector 'Terminator3 'is a standard coin that underwent some changes that allowed it to detect gold and ignore other non-ferrous metals.With the use of the scheme with a special regime of' all metals ', the device can search for any scrap metal.
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Non-standard application of logic as an op ampis the basis of the scheme of the metal detector. The disadvantage of this is the extra noise and unknown KU of all the chips. Of course, you can use the domestic logic to create the device, but this threatens with too much variation in parameters. Reduce the damage and avoid additional problems by replacing the sound chip with a domestic analogue. Cost of a metal detector The price of the metal detector 'Terminator' is inmiddle range.
If compared with similar devices of the same category, then 'Terminator 3' bypasses them by such parameters as the accuracy of identifying the object and the depth of the search. More inexpensive analogues are much inferior to 'Terminator 3' in all respects. Metal detector setting The diagram of the metal detector indicates certainnodes, which are taken into account, since with further assembly will have to focus on them. This may also be necessary during the setup of the metal detector.
The oscillation of the current is generated by the generator after the transmission coil is connected to it. Such oscillations emerge from the microcircuit MC1 in the form of a meander. The current induced by TX and creating the field is transmittedthrough the receiving coil. On the field generated, the search coil is balanced with TX: in other words, the field RX is subtracted from the TX field.
For this purpose, the compensation coil CX is used. Depending on the sensors, its representation changes: in the case of the DD CX sensor, the coil is virtual, in the 'RING' sensor, CX is real. It is connected in such a way that the direction of current flow in it is opposite to the receiving coil.
The balancing of RX and TX is achieved by unwinding from the compensation coil. The oscilloscope controls the balancing of the balance,so that the minimum amplitude is set in all positions of the knob. One end of the compensation coil goes to make a tuning loop, which is activated after the amplitude reaches a certain point, in which it again begins to grow. TX and RX are presetly tuned in frequency, while TX should be higher than RX at 100 Hz. You can adjust all the coils to the desired frequency by connecting them to the 'Terminator 3' metal detector and the oscilloscope. You do not need to adjust the CX by frequency.When a metal object appears under the sensor, the balance is disturbed, which causes the current to flow into the RX, which is then fed to the preamplifier and the sync detector, which fixes the phases of the incoming signal and outputs them to the amplifying channels. In the latter, all received parameters are amplified and fed to the comparator MC8, which compares the received signal levels and activates the sound generator.