IDX-PRO+VDI

[Aleks85]

I used 0.24 mm wire for the RX; it was hard to find anything else for free. I only made concentric sensors; for a 24 cm diameter, the air sensitivity was 30...35 cm (about five kopecks in the USSR), and a little less in the ground, but not lower than 25 cm.
The TX amplitude was 16 volts from peak to peak with the generator powered by 8 volts, this metal detector does not need more.

[Sergey_P]

for PX the wire is 0.18...0.24 mm and an inductance of 36 mH, then it is important to set the frequencies of TX - 6.59 kHz and PX 4.6 kHz.

It's best to use wire 0.24 mm thick or thicker with an additional resistor to achieve a total resistance of R(L) of ~67 ohms. 272 turns per coil with a diameter of 20 cm. In this case, the phase shift in the coil will be close to the phase shift of the surrounding ground, and the influence of the ground on the phase will be minimal.

[Smirnov-Arta]

///

Please don't take offense, but... once you take the unit out into the field, you'll see that's not the case at all. Again, even if you do manage to achieve 1–2 Amps at the coil, the gain in depth in actual soil will be negligible compared to the resulting instability of the device's overall operation. Believe me, it’s a dead end. But that’s up to you.

[h9361]

Here is a normal, working diagram; it was according to this scheme that I assembled several metal detectors.
It is very important to make a normal sensor, the main thing here is the correct wire diameter - at least 0.6 mm for TX and an inductance of 0.580 mH, for PX the wire is 0.18...0.24 mm and an inductance of 36 mH, then it is important to set the frequencies of TX - 6.59 kHz and PX 4.6 kHz.
In this metal detector you need to very accurately set the TX and PX frequencies, only then will it work normally and have good sensitivity.
You also need high-quality components, now they sell a lot of bad radio components, and if you bought them for good money, this does not mean that the part is of high quality. I described how you can simply check a microcircuit, there is nothing complicated here, in the end you can be sure whether it is of high quality or not.

Thank you.
Do you remember your Air testing distance?
Now, i am doing Mr. Orbit suggestion on my PCB.

[Aleks85]

Here is a normal, working diagram; it was according to this scheme that I assembled several metal detectors.
It is very important to make a normal sensor, the main thing here is the correct wire diameter - at least 0.6 mm for TX and an inductance of 0.580 mH, for PX the wire is 0.18...0.24 mm and an inductance of 36 mH, then it is important to set the frequencies of TX - 6.59 kHz and PX 4.6 kHz.
In this metal detector you need to very accurately set the TX and PX frequencies, only then will it work normally and have good sensitivity.
You also need high-quality components, now they sell a lot of bad radio components, and if you bought them for good money, this does not mean that the part is of high quality. I described how you can simply check a microcircuit, there is nothing complicated here, in the end you can be sure whether it is of high quality or not.

[Orbit]

To connect the capacitors as shown in the diagram! Not going into the details of the pcb because I've never used that pcb.Just place the capacitors as I mentioned and as you moved them on the scheme you posted and let me know if there are any improvements..

[h9361]

First remove C5 and C6 and move the same capacitors at the input to the amplifiers or behind 100k! My TX capacitor is 470 nf with 45 circles of 0.45 mm thick wire and rx 140 circles and 0.25 mm thick. And R25 replaced from 10k to 1k..

Thank you for your guidance.
See attached, is the changing true (C5 and C6)?

Please see the PCB, i think R25 is 47R. Is it true?
Now i am using 47R.


About your inductance, i measured for 30cm coil.
I think your
TX is 1.3mH, with 470 nF, Frequency is 6.4Khz (0.45mm wire)
RX is 13mH, (0.25mm wire)
Do you remember your RX capacitor?

[Orbit]

First remove C5 and C6 and move the same capacitors at the input to the amplifiers or behind 100k! My TX capacitor is 470 nf with 45 circles of 0.45 mm thick wire and rx 140 circles and 0.25 mm thick.And R25 replaced from 10k to 1k..

[h9361]

The small pcb was taken off the idx that Bill mod finished, it's actually the pump charging schematic, and last time I did the idx was a 00 coil and the number of turns was tx 45 with rx 140, range in air 50cm.

Thanks, my Air test was 8V, not 15V.
Do you remember your TX and RX inductance, Wire size and parallel capacitor?

[h9361]

Either you don't know how to adjust the timing potentiometer, or it seems you don't know how to wind the coil; the one I built—I don't recall if it was 27 cm or 32 cm—had a range of 45–50 cm in an air test. Conditions in the field are different, of course! But if the device picks up the metal well and you watch the LCD screen, it performs quite solidly... And did you move the filter capacitors (located after the 100k resistor) to ground? If you stick to the factory schematic, those capacitors at the output of the CD4066 chip drastically reduce detection depth!

Thank you for your posts.
See schematic, is your mean 1uF+22K or 220n+100k?
I checked my parts, it is exactly like schematic.
Now, my Air depth for a coin (made of Copper, zinc and nickel, 25mm diameter) is 31-32 cm.
My coil size is 30cm.

[gurdal]

Admiral TX, approximately ACV, pumps 12 volts; the system is very different, though.
It makes people wonder whether it might be capable of sensing things from even greater depths.

[Orbit]

Idx - pcb - smd..

[Orbit]

I can claim that when the ground is soaked after heavy rains, the ib goes deep, but when the ground is dry as powder, not a single ib goes deep. Second, it depends on the type of soil where the solid soil is clay or mineralized and the same device that achieves fantastic results in loose soil in clay may not detect a target more than 15cm.

[Orbit]

Hello everyone
The IDX Pro is such a great device.
If it could detect a 50-cent coin at a depth of 35 cm underground, there would be no need for another device.
Four years ago, I made a coil with 30x25 dimensions, an inductance of 1.023 mH, and an RX value of 11 mH.
It detected the coin in the attachment during the field test.
The fact is, the IDX Pro is a device capable of working with all types of coils, provided it is properly calibrated.

In places where there is no mineralization, where the soil is loose, I think it can detect the coin at 30 cm, maybe more, but it is set to (All metals) and we are only looking at the LCD display for discrimination. I have found the most silver coins with idx, I have tried a lot of new acclaimed models like deus 1 gmax 2 etc. none of these I can say did not pass the test next to idx Whites!

[gurdal]

Hello everyone
The IDX Pro is such a great device.
If it could detect a 50-cent coin at a depth of 35 cm underground, there would be no need for another device.
Four years ago, I made a coil with 30x25 dimensions, an inductance of 1.023 mH, and an RX value of 11 mH.
It detected the coin in the attachment during the field test.
The fact is, the IDX Pro is a device capable of working with all types of coils, provided it is properly calibrated.