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Interesting information about treasure hunters
Metal detector Pirate with his own hands
A pirate is a pulsed metal detector with a simple and easy-to-repeat pattern. The metal detector contains a small number of elements and an easy-to-make search coil. With a 280mm coil, the pirate wakes up to 20cm and the large metal up to 1.5 meters.

Pirat got its name from the developers of its scheme - PI - the impulse principle of its work, RAT - abbreviation from “Radio Scott” - the site of developers.

The METAL detector PIRATE does not distinguish metals. But it is good for metal search and for beginners. Also a huge advantage of the pirate, is its simplicity for self-manufacturing and availability of components - all parts of the metal detector cost a penny and they can be found in any store of radio parts or in the radio market. Also, the Pirate lacks programmable elements, which greatly simplifies the life of radio amateurs. Even a person with a minimum level of training will make a metal detector pirate with his own hands.

Pirate Metal detector scheme

The PIRAT metal detector has two variants of the scheme, the first version uses the CHIP NE555 (the Soviet analogue of the chip - KR1006VI1) - timer. But in case you have problems with its search, the authors have provided a variant of the scheme on transistors. We recommend you to collect the scheme on NE555, it wakes up to have better stability of work.

Pirate Metal Detector Scheme on NE555

(There is a marking error on the diagram - R18 is R9) !

Fixed Pirate Metal detector scheme for the NE555 version

Pirate Metal detector scheme on Transistors

When assembling a circuit on transistors, you need to pick up the frequency and duration. Since transistors have a wide variation in parameters. To do this, you need to use an oscillograph. Archive with oscillograms.

The R1 resistor in the diagram is responsible for the frequency of generation.

And the R2 resistor is for the duration of the control impulse.

Pirate board

Options for wiring the pirate’s circuit board, from its developers, on a chip and on transistors. Boards in the format of Sprin Lyot download archive .

Fee on NE555.

Here’s another version of the PIRATE metal detector board on THE NE555

The transistor fee.

Also online, we found this option of breeding a board for a metal detector PIRAT.

Once you’ve soldered the metal detector fee, you need to connect the food to it. Any power source with a voltage of 9-12 volts is suitable for this. You can use several parallel 3-4 cro’s batteries connected. Or a battery. 1 crown is undesirable, as it wakes to a rapid drop of voltage, and this will cause a constant drift of the metal detector setting.

Metal detector pirate’s sleeping fee

Notice the capacitors on the left! these are film capacitors with high thermostability. Their use will also have a positive impact on the stability of the metal detector.

In the sale of one of our advertisers found this version of the printed board metal detector PIRATE, a fairly thought-out version of the circuit board. The changers immediately stand on the board, to connect the power is a pin connector.

Types of metal detectors set up for the ground
Here is a drawing of this printed board for the Pirate (Truth in the form of a picture, if someone draws, send it out!):

Making a reel for a metal detector PIRATE

Like other pulsed metal detectors, the pirate is not demanding to the accuracy of the coil. It is quite suitable coil, rewound on a frame with a diameter of 190-200 mm - 25 revolutions. 0.5 mm wire with a wire. After winding, the coil twists should be wrapped with insulation tape or tape. To increase the depth of the metal detector search, you can reel 260-270 mm - 21-22 revolution, the same wire.

Calculations of the coil for the metal detector PIRAT for different diameters of the coil:

It is recommended to use a wire with diameters of 0.5-0.6mm, 0.4 is the minimum but works worse!

To work, the metal detector coil must be fixed in a hard metal casing. You can use any suitable plastic case. This is necessary to prevent the impact of blows on grass or soil on the work of a metal detector. The case for making the coil, you can find on the Internet, on request “Metal Detector Case” When making search coils, using any metal parts, is highly not desirable. Conclusions from the coil to the stranded wire, with a diameter of 0.5 - 0.75 mm. Ideally, these are two separate wires, retinue among themselves.

Set up a pirate metal detector

Properly assembled metal detector, almost no need to be set up. The maximum sensitivity of the metal detector is obtained in that position of the R13 variable resistor, when rare clicks appear in the dynamics. If you have this in the extreme positions of the resistor, you need to replace the R12 resistor namal, so that the optimal setting was approximately in the average position of the variable resistor.

If you have an oscillograph, you can also control the following values: on the ttransist T2 transistor shutter the duration of the control pulse and the frequency of the generator. The norm wakes the duration of pulse 130-150x, frequency 120-150 Hz.

Working with the metal detector PIRAT

After turning on the metal detector, it is necessary to wait 10-20 seconds to stabilize the work, and then the R13 variable resistor, to set it up. And you can start searching.