coil 180cm for golden mask deep hunter 3 se pro

[kt315]

no sense to run for minimization of the coil resistance. this sniffer-similar product is working on FIRST DELAY beginning from 40-50us.
in real seeking it sets on 100 and more. the damping resistor value was been taken from delta pulse circuit directly 'as-is'.
or, this detector is very sensitive to the resistance but no pcb, no schematic, then you are not able understand/see the ideology.
and again. if i see RESET knob on the face it's clear for me i see the sniffer-similar production. doesn't matter its name.

The coil is made from a 12-core cable. - because simplification of assembly and reduction in cost. no different goal.
naked commercialization.

[Carl-NC]

I'm not a PI expert ... but this seems like the single turn is acting like a partial damping resistor. If there were perfect winding coupling, it's a 11:1 transformer. and that 1.1 R across a perfect zero-Ohm loop would appear like a ( 11 x 11 x 1.1 ) = 134 Ohms damping resistor across the ends of the 11-turn loop.

This is the part that doesn't make any sense. A 125cm single loop has an inductance of 1.23uH so with the resistance the tau is 1.11us. It acts like a target but the tau is so fast it probably won't make any difference. I wonder if it's just 12-turn coil with a series resistor to give it a desired total resistance.

[Skippy]

Quote:"A 125cm single loop has an inductance of 1.23uH so .... "
But you can't analyse it as a single loop, because it's coupled magnetically to the other 11 wires. Just like you can't evaluate an 11-turn coil as eleven single-turn inductors in series ... that's why for a multi-turn loop, L is roughly proportional to 'turns-squared' , not 'total turns' .
----
The simplest way to determine if the 0.88 Ohm resistor is connected in series with the whole 12-turn coil is:
Pass a high DC current, say 200 mA, through the whole coil, and measure the voltage across the 0.88 R resistor. If it's zero volts, it is part of the isolated single-turn loop. If it's not, the 0.88 R is in series.

[Op04]

Not forget measure inductance for huge coil, for some meter it never show value, must connect in parallel with coil using 10-47K ohm. Real inductance meter is exceptions.

[qedqad]

The damping resistance of 2k2 is in parallel with other resistance in the same device


What needs to be taken into account is that the depth of discovery without tying the wire 8 to itself in this way reduces the depth by a percentage of up to half.


True melody
Skippy summary is true
11 wires connected in parallel
And only one wire ( connected with itself as I explained to you


After several experiments I reached 7 times, and I do not have enough experience the best result was as follows


12-way cable
Single wire thickness 0.75


Exactly the same way of wrapping
Impedance 2.5 ohms


The depth and stability were excellent

[Skippy]

As a rough guide, the total length of wire you need for the larger coil will be similar to the length of wire in the existing coil, perhaps +10 percent more.
So, original length = ( 11 x 1.25 x Pi ), new 1.8 metre coil approx total length = 1.1 x ( 11 x 1.25 x Pi )
New coil has approximately ( Turns x 1.8 x Pi ) = 1.1 x ( 11 x 1.25 x Pi ).

I calculate Turns = 8.4 T , so you choose 8 or 9 turns.

What I do recommend is you use ALL of the conductors in the 12 core cable, do not leave any 'floating'. This increases the magnetic coupling between wires.

So for example: You choose 8 Turns, plus the single turn with resistor(s). This leaves you with 3 wires to use up, which you put in parallel with 3 of the 8 wires, like this:
#1 + #2 + (#3//#4) + (#5//#6) + (#7//#8 ) + #9 + #10 + #11 ;
Wire #12 connects to itself with the damping resistor(s). You will need to experiment with the value of this resistor. The resistance of the wire in the single loop is higher, by a factor of (1.8 / 1.25) ,but the transformer ratio is now (8 : 1), not (11 : 1), so the resistor has more effect. I think more than 0.88 Ohms is needed ... some simple calculations suggest that approximately 1.7 Ohms is required. So I recommend experimenting with resistor values from 1.0 Ohms up to 2.0 Ohms.

[qedqad]

As a rough guide, the total length of wire you need for the larger coil will be similar to the length of wire in the existing coil, perhaps +10 percent more.
So, original length = ( 11 x 1.25 x Pi ), new 1.8 metre coil approx total length = 1.1 x ( 11 x 1.25 x Pi )
New coil has approximately ( Turns x 1.8 x Pi ) = 1.1 x ( 11 x 1.25 x Pi ).

I calculate Turns = 8.4 T , so you choose 8 or 9 turns.

What I do recommend is you use ALL of the conductors in the 12 core cable, do not leave any 'floating'. This increases the magnetic coupling between wires.

So for example: You choose 8 Turns, plus the single turn with resistor(s). This leaves you with 3 wires to use up, which you put in parallel with 3 of the 8 wires, like this:
#1 + #2 + (#3//#4) + (#5//#6) + (#7//#8 ) + #9 + #10 + #11 ;
Wire #12 connects to itself with the damping resistor(s). You will need to experiment with the value of this resistor. The resistance of the wire in the single loop is higher, by a factor of (1.8 / 1.25) ,but the transformer ratio is now (8 : 1), not (11 : 1), so the resistor has more effect. I think more than 0.88 Ohms is needed ... some simple calculations suggest that approximately 1.7 Ohms is required. So I recommend experimenting with resistor values from 1.0 Ohms up to 2.0 Ohms.

It is clear to me from the conclusion that the information is correct. But it is not, the most suitable resistance was actually 1.7 ohms in the 1.8 meter coil. The cable was like the smaller coil, but the thickness is more than 0.75, and therefore the resistance is equal by 95 percent and more. In the small coil 125 cm it was 2.5 and in the large 2.6, the depth and stability is excellent. I tried many ideas, but I am sure that if you open the factory coil You will find it close to my result with a very high percentage. I contacted one of them and he owns the two files, and he assured me that the thickness of the large file is slightly larger than the small, and this is what I have the weight of 0.75, it is the standard measurement after 0.5

[qedqad]

Frame (coil search ) 180 cm for golden mask deep hunter

Cable 12 core ( unshielded )
wire thickness : 0.75 mm
Flexible stranded
Final Resistor : 2.5 ~ 2.6 ohm

[Skippy]

I do not understand what you have done. You said you used 7 turns, but your drawing shows you have used 11 turns; and the resistor is connected differently.

However, you seem to have made a successful coil, so I hope it helps you locate some great finds. Best Wishes.

[kt315]

IMG_20221015_193747_HDR.jpg

from your first story you must set the resistor in parallel to one turn, while on the sketch i see you show resistor in serial.
delete it anyway. connect turns directly.

[qedqad]

I do not understand what you have done. You said you used 7 turns, but your drawing shows you have used 11 turns; and the resistor is connected differently.

However, you seem to have made a successful coil, so I hope it helps you locate some great finds. Best Wishes.

Don't forget that the cable used for the large file is 0.75

[Op04]

Don't forget that the cable used for the large file is 0.75

Would you share the inductance value? Thanks

[qedqad]

Would you share the inductance value? Thanks

I would like to have a device to measure the coil inductance. But I apologize to you, I do not have a device that does this, I only rely on resistance and experience (depth and stability).

[Qiaozhi]

I would like to have a device to measure the coil inductance. But I apologize to you, I do not have a device that does this, I only rely on resistance and experience (depth and stability).

https://www.amazon.co.uk/Capacitance...ps%2C70&sr=8-5

[kt315]

https://www.geotech1.com/forums/album.php?albumid=113