TEFLON MULTI STRAND WIRE

[daverave]

i know very little about teflon wire...and i need to know the correct one to buy to make a pi detector coil...i saw some advertised 30 awg 7 strands...is this the correct wire to buy to make a fast coil..if not what do i buy ???? also do the strands have to be insulated...im new to all of this and need advice pls.

[porkluvr]

Problem with Teflon wire is that you will -probably- not find any that is stranded and also tin plated, no matter how hard you look. If it is stranded, silver or nickel plating is all you will likely find. Nickel is ferromagnetic and should probably be avoided.

Teflon has low dielectric constant (dc) to help minimize inter-winding capacitance but silver plating does little to isolate the individual strands and contributes to undesirable eddy currents.

Eric Foster has written that he uses tin plated PVC insulated wire, comprised of ten strands of 0.1mm. This would be approximately equivalent to 28AWG, .315mm, or 30SWG.

He did not mention the wire's voltage rating (insulation thickness). There are different PVC compositions, some with relatively low dc and some having somewhat higher dc. I have no idea which brand of wire to suggest.

I have read that stranded "marine wire" works well. I think that the insulation is foam PVC, which would have lower dc than solid insulation made from the same material.

I have also read some reports where folks have great success using Teflon wire but you should keep in mind that a coil that works well for one machine may or may not work well for another.

[daverave]

Problem with Teflon wire is that you will -probably- not find any that is stranded and also tin plated, no matter how hard you look. If it is stranded, silver or nickel plating is all you will likely find. Nickel is ferromagnetic and should probably be avoided.

Teflon has low dielectric constant (dc) to help minimize inter-winding capacitance but silver plating does little to isolate the individual strands and contributes to undesirable eddy currents.

Eric Foster has written that he uses tin plated PVC insulated wire, comprised of ten strands of 0.1mm. This would be approximately equivalent to 28AWG, .315mm, or 30SWG.

He did not mention the wire's voltage rating (insulation thickness). There are different PVC compositions, some with relatively low dc and some having somewhat higher dc. I have no idea which brand of wire to suggest.

I have read that stranded "marine wire" works well. I think that the insulation is foam PVC, which would have lower dc than solid insulation made from the same material.

I have also read some reports where folks have great success using Teflon wire but you should keep in mind that a coil that works well for one machine may or may not work well for another.

Your right its not easy finding the right teflon wire....most is in the USA on ebay....just hope i can find some suitable wire...cheers for your advice.

[WM6]

You can put your chosen lenght of Teflon insulated Copper multi-strand wire to electric welding machine for short time to heat Copper strands and make surface oxidation on it. This oxidation act as insulation between strands that prevent interstrands eddy currents. Short heat, even wire glowing, do not harm Teflon insulation at all. The only drawback of Teflon is, that this insulation is pretty heavy. Teflon insulated multistrand wire for electrical installation purposses is pretty easy to find, I hope , everywhere. Ends of wire should be soldered before heating to prevent inter-strands welding.

[daverave]

someone has offered me some multi strand teflon wire but the strands are not insulated but twisted together...is this wire any good for making a fast pi coil ?????

[WM6]

someone has offered me some multi strand teflon wire but the strands are not insulated but twisted together...is this wire any good for making a fast pi coil ?????

Why not? By "insulated" we can talk here of outer insulation only, not of inter-strand insulation.
For inter-strand insulation you need to take Litz wire (couple of those in paralell - how much in paralell depend on specific Litz wire used).

[daverave]

i just really want to know if the strands have to be indiviginal insulated ????

[daverave]

question

so do i need to find litz wire to make a fast coil cause the indiviginal wires are insulated or non insulated multi strand wire ???? pls just a straight answer cause im confused.

[kt315]

you can do litz yourself. take 0,3-0,2 mm insulated 3-4 wire and spin them together. yes, it is not so easy work, yes, it is not so productive work, but you ask
about litz. I did go in wood, stretch out a wire between trees... so I got 30 meter of litz.

[kt315]

this is litz and this is a basket coil.

[WM6]

this is litz and this is a basket coil.

yes, or this "no basket" example usual Litzing wired coil version:

[kt315]

i wrote BASKET coil! if you mean TO MAKE THE LITZ so why you do ORDINARY COIL on litz??????? for the ordinary coil you use ordinary wire and leave the litz!!!
LITZ ===>>>>> BACKET COIL ONLY====>>>> LOW IMPEDANCE ====>>>>>> WIDE SPECTRE RADIO FREQUENCIES

[daverave]

this is litz and this is a basket coil.

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hello kt315....whats the advantage of your basket coil ???? pls can you tell me if stranded wire has to be insulated every wire for it to be used in a detector coil ????

[6666]

Dave
traditional Litz wire was made from individual insulated wires soldered at each end. It was made mainly for radio applications.
here is a video showing one way to make it.
http://www.youtube.com/watch?v=LWL8qGCeTJA


(In some country's, and I dont know why,
but multi strand uninsulated wire such as speaker wire or radio hook up wire is sometimes referred to as litz wire.)

[daverave]

if i spin somehow the wires together to make litz can i use like 30/32/34 swg wire...which gauge is best to spin together for fast coil ???