shielding concentric

[sbalio1]

When using graphite with a Pi. Is it necessary to connect with ground wire

[sbalio1]

I used that.graphite pure
resistance 65-45 ohm

.

[Tibuck19]

For those looking for graphite shielding paint. I've tested out this shielding paint and three coats is giving 60 to 70 Ohms per inch. It easily goes on XPS foam, wood or paper and it appears to be very similar to what is used on Coiltek Goldstalker range of coils.

Available at the following link and ships from the US to Australia in about 3 weeks.

https://www.stewmac.com/Pickups_and_Electronics/Shielding/Conductive_Shielding_Paint.html

AuTitch

I cam across the something just last week, when i was looking for a good way to EMI shield a 3d printed box, I ordered a 1/2 pint to test it out, i don't see why it wouldn't work well for coils

[autitch]

For those looking for graphite shielding paint. I've tested out this shielding paint and three coats is giving 60 to 70 Ohms per inch. It easily goes on XPS foam, wood or paper and it appears to be very similar to what is used on Coiltek Goldstalker range of coils.

Available at the following link and ships from the US to Australia in about 3 weeks.

https://www.stewmac.com/Pickups_and_Electronics/Shielding/Conductive_Shielding_Paint.html

AuTitch

[kt315]

I have used Graphit 33 for the shield. I have 4 k Ohm with one coil. Everywhere at the coil.
But the other one has 100 k Ohm at on spot and 14 k Ohm where the wires go into the coil.

Do you think 100k is good enough?

i had answered you CAN economy Graphit 33. just add graphite powder in it. take the graphite FROM ANY old battery, its are like a rod there.

[sbalio11]

Graphite with the polymer works well. Resistance should be as low as possible.

[cavalry]

Wow...great idea!

[BKY1337]

I have used Graphit 33 for the shield. I have 4 k Ohm with one coil. Everywhere at the coil.
But the other one has 100 k Ohm at on spot and 14 k Ohm where the wires go into the coil.

Do you think 100k is good enough?

[dbanner]

Also, wrapping a bare wire all the way around(except for gap) over the graphite reduces its overall resistance, This is like an extended drain wire. I see this done somewhere in video I posted. It appears that the resistance of sheild(graphite) is important. But it depends on the graphite mix you used, it may not be needed.

[BKY1337]

Thanks! I made it now without the wire over the gap.

[dbanner]

Does the wire join the both ends of graphite, then yes, I believe so. It must not form a complete loop.

[BKY1337]

I have a question. Today i sprayed my DD coils from my TGSL with graphite laquer.
Will a small cable over the gap destroy the effects of a faraday shield?

Like in this picture:

[lamoiz]

yes working pretty well
The coils are protected from below, the sides, the top ..by graphite paint. the tests were void when I plunged the coils directly into the paint ...

[dbanner]

So it's working good now? noticed you shielded windings themselves.

[lamoiz]

1 eur ... 28 cm ... after shielding above ....