The metal detector is a very specific and unusual tool that not everyone can need. Despite its uniqueness, a metal detector is the dream of many people. Most try to purchase such equipment, but you can do it yourself. Detailed terminator 3 metal detector instructions and diagrams 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 that assembling a metal detector according to detailed instructions will be very difficult for those who have never before been interested in and used such equipment. It will be really difficult to carry out such work, but do not be afraid: it’s enough to carefully prepare for the process and collect all the necessary details and elements.
Detection depth
A metal detector can search for coins and other items at different depths:
- Five rubles - 22-24 cm.
- Catherine's nickel - 27-30 cm.
- Helmet - about 80 cm.
- Beer can - meter or more.
All the above parameters are calculated for sensors with 240 mm in wire and chernozem soil. Separately, it is worth mentioning the discrimination of the Terminator 3 metal detector by many users, which is completely unfair: unlike its counterparts, which can only determine the depth of a particular object, this model determines the metal of which the object is made.
Metal detector assembly
To assemble and configure the metal detector you will need the following equipment:
- Oscilloscope.
- Multimeter.
- Generator.
- LC meter.
- Frequency meter.
When buying the entire listed set for a metal detector, you have to pay a tidy sum. To save money, many users prefer to confine themselves to a virtual measuring complex based on a personal computer. You can find suitable software designed for such purposes on the Internet.
Metal detector circuit
In its design, the Terminator 3 metal detector is a standard coin box that has undergone some changes that allowed it to detect gold and ignore other non-ferrous metals. When using a circuit with a special “all metals” mode, the device can search for any scrap metal. The standard scheme allows the metal detector to search for coins, nothing more.
The non-standard application of logic as an op-amp is the basis of a metal detector circuit. The disadvantage of this is unnecessary noise and unknown KU of all microcircuits. Of course, it is possible to use domestic logic to create a device, but this threatens with too much variation in parameters. It is possible to reduce damage and avoid additional problems by replacing the sound chip with a domestic analogue.
Metal detector cost
The price of the Terminator metal detector is in the middle range. If compared with similar devices in the same category, then “Terminator 3” bypasses them in such parameters as the accuracy of identification of the object and the depth of the search. Cheaper analogues are significantly inferior to "Terminator 3" in all respects.
Metal detector setup
On the metal detector circuit, certain nodes are marked, which are taken into account, since during further assembly it will be necessary to focus on them. This may also be needed during the setup of the metal detector.
The oscillation of the current by the generator is carried out after connecting the transmitting coil to it. Such oscillations come out of the MC1 chip in the form of a meander.
The current induced by the TX and creating the field is transmitted through the receiving coil. The search coil is balanced with TX along the generated field: in other words, the RX field is subtracted from the TX field. For this purpose, a compensation coil CX is used. Depending on the sensors, its presentation changes: in the case of the DD CX sensor, the coil is virtual, in the “RING” CX sensor it 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 balance, due to which the minimum amplitude is set in all positions of the handle. One end of the compensation coil goes to the production of a tuning loop, which is activated after the amplitude reaches a certain point at which it begins to grow again. TX and RX must be pre-tuned in frequency, while TX should be higher than RX by 100 Hz. All coils can be tuned to the desired frequency by connecting them to the Terminator 3 metal detector generator and the oscilloscope.
You do not need to tune the CX in frequency. When a metallic object appears under the sensor, the balance is disturbed, which provokes the current entering the RX, which is then fed to the preamplifier and a synchrodetector, which captures the phases of the incoming signal and outputs them to the amplification channels. In the latter, all the obtained parameters are amplified and fed to the comparator MC8, which compares the received signal levels and activates the sound generator.
The principle of operation of almost all metal detectors is similar to each other, with the exception of some nuances. In most cases, they affect the detuning of the device from the ground. In the case of the Terminator M metal detector, phase detuning.
Checking the instrument board
After soldering all the parts of the circuit, the metal detector printed circuit boards are checked. This is done in order to verify the quality of the solder circuit and its performance.
Verification is performed as follows:
- The printed circuit board of the metal detector is thoroughly washed out from traces of flux left after soldering. It is advisable to remove all residues, since in the future they can cause breakdowns and malfunctions.
- The board power is turned on without activating the sensor.
- The sensitivity knob is twisted until a steady sound signal appears from the speaker.
- To interrupt the speaker signal, just touch the sensor connector with your finger. Interruption of the emitted sound when touched indicates that the metal detector board has been soldered correctly.
- After turning on the power, the LED blinks and goes off. When the power is turned off, the diode lights up and gradually fades.
Battery Discharge Indication
When the battery is discharged, the metal detector emits sound signals at regular time intervals. This is accompanied by continuous burning of the LED and a sharp decrease in the sensitivity of the sensors.
The frequency settings of the detector are made using the cable with which the device will be used in the future. The cable length remains unchanged after making all the necessary frequency settings.
Metal Detector "Terminator Trio"
"Terminator Trio" - a two-tone metal detector, equipped with a DD-coil with dimensions of 250 x 300 mm. It is equipped with four settings modes - "Sensitivity", "Volume", "Discrimination" and "Ground balance" - and a switch between non-ferrous and non-ferrous metals.
Benefits
The advantage of the Terminator Trio metal detector is the confident identification of non-ferrous metal objects. The device finds non-ferrous metal in 85% of all operations, the remaining 15% falls on iron and rusty objects.
Another plus is the absence of false positives. Many analogues react to the edges of dug holes, grass stems or small wires, than the Terminator Trio does not sin.
disadvantages
The only minus of the metal detector is a poor definition of rusty iron. In almost all situations when the device gives a dirty signal, that is, mixing black with an admixture of color or, conversely, color with an admixture of black, there is a rusty metal object.
Of course, this drawback can simply be ignored, but at the same time there is a chance of losing some of the finds due to an incorrect signal. You can only distinguish between a clear color signal and a dirty signal when gaining experience with a metal detector.
Search depth
Feedback from users on the Terminator suggests that the maximum search depth of the metal detector exceeds the same parameter of another model - Asi 250 with a standard coil. Despite such assurances, in practice it turns out that according to this criterion, "Terminator" is equal to "Asa." When searching in the air for 50 Ukrainian kopecks, the detection depth is 32 centimeters, while the search on the soil of the same coin is limited to 26–28 centimeters with reduced sensitivity. Basically, a metal detector allows you to detect objects at a depth of no more than the bayonet of a shovel, which, however, can be a very good indicator for such a device.
The Terminator Trio metal detector cannot be attributed to devices that can start searching immediately after switching on. The cost of the device is several times less than the cost of the new ACE 250 model, but the Terminator is more suitable for those searchers who want to try their hand at instrument search.
Summary
It’s not so difficult to assemble a metal detector with your own hands . This will require certain financial and time costs, but at the same time, a user who has assembled a metal detector on his own will receive certain advantages as a bonus.
"Terminator 3" is a rather powerful device in comparison with similar proprietary models of metal detectors. Given the fact that you can assemble it with your own hands with the possibility of saving money, it is more affordable, profitable and attractive to users.
It is quite difficult to assemble and set up a metal detector in the absence of the necessary experience. Beginning hams in specialized forums are provided with detailed instructions and manuals that will allow you to carry out all the work correctly and without errors, which is very important when working with electronics.
The advantage of the Terminator 3 metal detector and subsequent models is the possibility of self-assembly of the device and an affordable price. You can find the necessary schemes on the Internet at specialized forums of specialists professionally engaged in the search for metal objects. The creators of the device are always ready to help with advice to those who plan to assemble a metal detector on their own.