coil shieldind info...

[lamoiz]

Good evening to all, I have a question concerning the realization of a coill for my IDX. I realized the TX and the RX ... no problems ... then regulation in DD Thus the functioning is correct ... 10c of euro in 20 cms ... I decide to integrate him into the mold to pour her into the epoxy. Before flowing, I realize around every reel, shieldind with an adhesive aluminum. The thing is, since the shielding... it works really very very badly and the detection is not correct anymore of the whole ... why? How to correct this problem ...? Thanks to all for your help ... I do not understand anymore ....

[homefire]

Photo's are good. Did you shield the individual coils or the shell?

[kt315]

i do not see pics but grasp you closed up a coil E-magnetic field by the shield. if you connect two holes in wall socket AC220V by a nail what you get?

[homefire]

That's what I'm thinking. He left no gap.

[6666]

i do not see pics but grasp you closed up a coil E-magnetic field by the shield. if you connect two holes in wall socket AC220V by a nail what you get?

A very bad day

[lamoiz]

Good evening, well tomorrow I'll make pictures of my coils.
Yes, the aluminum adhesive is directly placed on the coils.
And no, this one does not close the loop, there is a space of 10mm between the beginning and the end of the screening ....
Put the wires in a wall outlet of 230v !!!! Oupsss I will put my house in the dark! The 40Amp circuit breaker will blush !!!
Thank you all for your help.

[kt315]

That's what I'm thinking. He left no gap.

thinking he also closed a foil on tx with the foil on rx side. and as a result he got hot chicken.

[6666]

Good evening, well tomorrow I'll make pictures of my coils.
Yes, the aluminum adhesive is directly placed on the coils.
And no, this one does not close the loop, there is a space of 10mm between the beginning and the end of the screening ....
Put the wires in a wall outlet of 230v !!!! Oupsss I will put my house in the dark! The 40Amp circuit breaker will blush !!!
Thank you all for your help.

Check that the foil on both coils are insulated from each other.

[lamoiz]

my coil with shielding..

[kt315]

you had deleted the closing after all comments LOL!

i never suggested to use a foil. where you read to use a foil??? whats going on there guys!

[lamoiz]

Hello,
Not at all, I think I found the problem. The inductance value changed when I tightened the shield too .... so I will start another coil rx ...
Thank you to all ..

[Nexus]

Hello,
Not at all, I think I found the problem. The inductance value changed when I tightened the shield too .... so I will start another coil rx ...
Thank you to all ..

The only problem I see on your picture is the fact that when you made the shield you did not leave a small gap between the two end of the shield. So effectively the shield is acting as a closed loop on both coils.
You need to leave a couple of millimeters open gap between the beginning and end of the shield. This gap is best to be situated on the opposite side of the coils against the wire exit of each coil.

If you use aluminum foil the inductance value will always change a bit, but this is not the problem.

[BKY1337]

What is better for the bare wire, aluminium or copper?

Why is aluminium better for the shield?

[kt315]

What is better for the bare wire, aluminium or copper?

Why is aluminium better for the shield?

let me know a name whom said you aluminium better for the shield? NAME of this man pls.

[homefire]

Not sure about it being Better but it's handy and Cheap. I use copper foil tape for the coils them selves if I don't use Carbon in the shell. http://www.banggood.com/search/coppe...ding-tape.html