XP deus coil modification

[Henrikras]

Gulfnut.
The new Shell is not ready, I Ran out of graphite paint and need to ordre some more. ( Two lay gave only 20-30 Kohm)
I'm trying to upload a video but something is gives me problem with utube!! That had answered a lot, allso about the drain wire.
hope to back soon with the vid.
Henrik.

[Henrikras]

This is what I'am trying to copy... The video is showing how XP made the Shell with the shielding.
link. http://www.youtube.com/watch?v=kSRr-biC1x4&sns=emPs. In a earlyer thread Satdaveuk had got some of the same ideas (this was in 2012).. Dont know If he succes or not !

Henrik

[golfnut]

I estimate 20-30k oh,s is on the very upper limit of what is practical. Single figures would be better.

You could mix carbon/graphite powder with your pot resin - to help lower the R.

Good luck - you will get there

[Henrikras]

Are you Saying that I could mix the Compound mass (this - http://www.circuitspecialists.eu/bla...ating-compound )
with some graphite powder, do some test to learn the amount (20/80 - 50/50) and fill it in ?
But what about the distance to the RX / TX - I learned that we need a distance from the shielding to the coils !

[golfnut]

OK watched the video


Outer shell surface has conductiove layer.

Inner of shell conductive layer...



Questions
If you get a contact anywhere on the shell - does it connect to the drain wire?

Does the grey top / finish epoxy conduct?

Does the inner Dark grey epoxy conduct?

[golfnut]

It is more of an issue with PI machines as the addition capacitance slows the coil up.


With a VLF its not a real problem, especially with carbonised infill.

[golfnut]

both of these constructions work.

[Henrikras]

OK watched the video


Outer shell surface has conductiove layer.

Inner of shell conductive layer...



Questions
If you get a contact anywhere on the shell - does it connect to the drain wire? YES - out and in

Does the grey top / finish epoxy conduct? NO

Does the inner Dark grey epoxy conduct?

NO - If you ask this darker spot the drain wire is seen at the top, and that is strange to me allso.


I think a good idea, is that investegate this one more time.

Thanks Guldnut.

[Henrikras]

RX and TX ready to coil project no.2.
Pictures 1 and 2
Henrik

[Henrikras]

I got to change statement... There was much more drain wires at the Stock coil.
They avoid loop with the drain wires.. See pictures - no drain wires at some places.
Henrik

[Skippy]

I guess they didn't put drain wires everywhere for cost reasons. This doesn't mean you have to faithfully copy what XP have done. The wires are undetectable to your machine, add them if you want. I have attached one simple way of fitting the drain wire.
I have a small test coil, that I used for experimentation, it is about 50mm diameter, 100 turns of 0.2mm diameter ECW. In total, there is about 10 grams of copper there, length about 15 metres. It is completely undetected by my machine.

I see you've 'balanced' the coils using a large capacitor. Very novel. HeHe.
Good Luck.

[Henrikras]

Yes Skippy... I Understand more and more about this. But I can allso say, that I made some mistakes earlyer.

[golfnut]

There is graphite on the first potting pour, with a drain. Then top up epoxy with no conductivity.

[Henrikras]

Yes Gulfnut.. Like a closed case. But the conductive plastic (shield outside allso) is a interesting construction. That could Be why the Deus is very stable, but some owners are complaining about GB more than chattering and so. Just my Thoughts.
Henrik

[Henrikras]

Hello -
Close to Be ready with coil no.2.
Learned a lot to day.
First problem was the same with coil no1, it couldn't work with low ID like Coke and Gold. Reason; the TX must Be spot on with the Inductance and the resonans. I had to take of 2 turns (now 197 - 0.315 wire).
The meter was at 19.45mH (goal 10.4) but the resonans was 150-200 hz to low... After taking to turns off (tryed with one first) everything just was more easy and it WORKED.
Another important thing I found out... There is a hole lot different in chattering (Remember I'm indoor), depens where the outer wire from the RX and TX is connected... Best proformance is the hot side both RX and TX coming from the outer, this wire where the coils is ends Winding them. That Strange and Maybee only this project there got this.!
I'm ready to close it... But please take a look at the Video. Link
http://www.youtube.com/watch?v=xuMXwEgN4cw&sns=em

Ps. I gave up the idea to go out and do some test, before closing up with the Compound mass... Its to difficult to glue and hold the coils.
A Big HOPE it will work this time.

I did the shielding with paint and sand and paint again... Now its 1-2 Kohm allover. Some place lower that 1 K, but Thats small area close to the drain wire.. I think Thats normal ?

pictures of the searchcoil ready to close.

Henrik