coil 180cm for golden mask deep hunter 3 se pro

[qedqad]

I own this device, I have a search file of 125cm, I wanted to buy 180 from the official website, they asked me for 400 euros with shipping expenses, to be honest this amount is large on just a cable with multiple exits.


So I opened the file I have and the details are as follows:
Cable 12 Output
All wires are connected in sequence
Except the wire number 8 is connected to itself by several resistors (2.2 ohms) parallel and sequential to give us a final value of approximately 0.8 ohms 2 watts.


The damping resistance is present in the same coil valued at 2k2 ohms 0.6 watts.


All resistors 1%


Question: Based on this data, how can I build a 180 cm file?

https://ibb.co/jHMLGDs
https://ibb.co/PY9twHN
https://ibb.co/gzBSm8J
https://ibb.co/0hb6h88
https://ibb.co/n0gC0wS
https://ibb.co/BtxpbJs
https://ibb.co/YpJYZCV
https://ibb.co/qpf6yVm

[kt315]

will be good if you will show the autopsy of the box.

[qedqad]

will be good if you will show the autopsy of the box.

No problem at all if you're going to benefit from it, the problem is having a durable epoxy-like layer, I'll attach pictures tomorrow, and the pieces are all SMD except capacitors, is there a way to remove this material without damaging the device?

[Carl-NC]

When attaching images it is best to use the Attachment Manager so the images get physically uploaded to the forum. Images from a free hosting service eventually disappear, making the thread worthless to future visitors.

[a7mdrat]

When attaching images it is best to use the Attachment Manager so the images get physically uploaded to the forum. Images from a free hosting service eventually disappear, making the thread worthless to future visitors.

Yes

[qedqad]

When attaching images it is best to use the Attachment Manager so the images get physically uploaded to the forum. Images from a free hosting service eventually disappear, making the thread worthless to future visitors.

Can you attach a picture for clarification, I don't know how unfortunately? What about my question in the matter?

[Qiaozhi]

I don't know how unfortunately?

Select "Reply to thread", and click on the "Go Advanced" button. Then select "Manage Attachments" > "Add Files" > "Browse".

[qedqad]

Ok
Whats about my question?

[Op04]

Ok
Whats about my question?

I've been there making very large coils 2 meter, but not commercial product, at 2.4 meter inductance slightly change, need to adjust more current to coil, but still above 330uh, hard to use on the field, ended up using 1.3m coil. For big coil by your pic 0.8 ohm could be lower try 0.6 do with your own risk! Try 8 turn for 180cm. But this only guessing since there will be alot experiment needed took so much patient to get the inductance fit.

[Carl-NC]

It sounds like the 125cm coil has 12 turns, but I don't understand the last part: "Except the wire number 8 is connected to itself by several resistors". You should draw a diagram of exactly how the coil is made. Op04 is correct, making a larger coil means fewer turns. Generally you want to get it fairly close to the inductance of the 125cm coil.

[Skippy]

An interesting coil, good luck with your new build.

Have you measured the 2.2 Ohm resistors to double-check the value ? They do appear to be (2,2,0) x 0.01 = 2.2 Ohm , but a careful check with a DMM would be worth doing. ( I learnt electronics when 4-band codes were standard - I never felt 100% confident with 5 /6 -band ones )

[kt315]

crazy mind of this guy to get 0,8 Ohm. what aim for - no answer. that is measuring on resistence level of tester probes and cable resistance level variation.
absolute nonsense.

Anatloy

[Skippy]

To summarise:

The coil is made from a 12-core cable. 11 of those cores are joined daisy-chain to make an 11-turn coil. The 12th turn is joined to itself by a resistor, value appears to be 2.2 // 2.2 // ( 2.2+2.2 ) = 0.88 Ohms.
11 turns measures as 2.5 Ohms. So One turn measures as 0.23 Ohms.
The single damped loop thus has a total resistance = ( 0.23 + 0.88 ) = 1.11 Ohms.

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.

Obviously it's an imperfect coil - PVC insulated wire will reduce inter-winding coupling.
And the 2K2 resistor is an additional damping resistor, on the whole coil.

Attached one of the original photos:

[Op04]

That 0.8 must be made from tungsten

[Skippy]

The cable will likely have some identification markings on it, but is probably something similar to this:

https://www.sab-cable.com/products/c...le/cc-500.html

I calculate: One turn = 3.9 metres. Resistance = 0.23 Ohms. Resistivity of copper = 1.72 x 10^-8
So Area = 0.29 mm²
Allowing for the resistance of the solder joints, and measurement error, it will be cable of cross-sectional area 0.25mm² to 0.5 mm² estimated.

Regarding the 'damping' resistor heat : I assume a coil of this size will be operated at low pulse rates, to suit the large ( long time-constant ) target size, and the slow speed which the coil will be swept.