shielding concentric

[dbanner]

https://www.youtube.com/watch?v=MpriTmWda4w

[lamoiz]

kt315 there is no attack .. it is just the answer to your tone and your way to get me high.
I have already
made the mix wood glue with graphite ..resultat very bad..tout the
powders of graphite do not have the same granulometry .. which plays on
the conductivity.
My initial question, in this case, what would you do .....?
what is the best resistivity for a shield .... on the forum there are all the values .. from 50 ohm to 2k .....? then does anyone have the answer?

[dbanner]

1.5Kohm per centimeter is what you want. https://www.youtube.com/watch?v=XnrStRklcUQ
look from 3.00 minutes where he says 1.5kohm per centimeter.

[dbanner]

What mixture of graphite will give 1.5Kohm per square centimeter is for experimentation, if you are mixing your own.

[Chiv]

measure a shielded piece from a xt17000 minelab and it read600ohms at 1 inch at the full length of cardboard it read650 ohms

Hope that helps
for got to say that this is a vlf detector wether that makes a differents or not with the shielding between vlf or pi detectors

[kt315]

your problem you do not see silver powder in fabric graphite aerosole. silver powder is also black color like graphite and
does have very perfect conductivity.

you do not have a chance to buy it.

[lamoiz]

good evening everyone
Here are the test results of guitar cavity shielding paint.
20 ohm per cm with 2 layers, about 500 ohm on 1 layer_ 1 layer of graphite pencil ... 5k per cm .....

[lamoiz]

my first test with white wood glue and graphite gave 1.5k per cm. this was a failure. suddenly I do not understand what ohmic value I must take into account ... 20 ... 500 .... 1.5k .... ???

[green]

my first test with white wood glue and graphite gave 1.5k per cm. this was a failure. suddenly I do not understand what ohmic value I must take into account ... 20 ... 500 .... 1.5k .... ???

Don't know what works best. I use EZ-SLIDE graphite based coating, usually measures 200 to 500 ohms as I poke different locations. Seems to work for me.

[dbanner]

I was wrong about 1.5kohm it seems, very wrong. It seems you have to get the resistance down to around 500ohms by adding more graphite to mixture( the lower the resistance, the better). This video I found is very good at explaining it all. And he even explains what he did in great detail with his coil. https://www.youtube.com/watch?v=QrG_sXSybM4

[dbanner]

Here the same guy mixes his graphite powder and shows you how. Very interesting. https://www.youtube.com/watch?v=SqM6eWwLIUs

[dbanner]

Seems that drain wire also lowers resistance.

[Koala]

I have no problems at 1k from one side of the coil to the other.

Then again there much more surface area on a my fully enclosed coil. If that makes a difference.

[dbanner]

And finally excellent video, very informative. Interesting how the outside of coil housing is shielded. https://www.youtube.com/watch?v=RtA1iVOBquA

[lamoiz]

Good evening
after manufacturing the coil holder and graphite paint from the bottom, the resistance is 400 to 1.5k end to end.
I decided to test in the wet grass .. just to see .... there is a multitude of false signals ...... more the coil reacts to the slightest vibration ...... I am really disappointed ....
ok it is not yet the resin that will surround the windings .... ok the shielding is not instalé .... but on my work plan, it ad excelentes discrimination .. selectivity and great distance of detection.1 eur at 30 cm ... gold ring at 20 cm
I do not know what to do for this shield. does anyone have an idea ??
thank you..