Any ideas on how to wind this PI coil ?

[kt315]

This is going to drive KT nuts loll , but I first print circular U channel which act's like a bobbin or spool ( much like how Garret makes their VLF coil spools), I did I bit of testing on making my PI coils this way and I see no real depth lost with an open air coil or a U channel spool made from ABS plastic, I'm sure what KT is trying to say is right, BUT shesh how else is one, to make a coil Especially for a Surf PI , it is not the most advance metal detect lol i'm no expect by any means, however i'm rather sure the circuit would never be fast enough for the kind of coils KT has in mind anyways! Perhaps KT can post photo's of finish coil that he makes ?

http://www.geotech1.com/forums/showt...l-for-baracuda

[6666]

Thanks for your input about fast coils, but this thread is only about the mechanics of winding this coil design, not about fast coils.

The original designer left the forum after some stupid political thread , so I cannot ask him.

[6666]

This is going to drive KT nuts loll , but I first print circular U channel which act's like a bobbin or spool ( much like how Garret makes their VLF coil spools), I did I bit of testing on making my PI coils this way and I see no real depth lost with an open air coil or a U channel spool made from ABS plastic, I'm sure what KT is trying to say is right, BUT shesh how else is one, to make a coil Especially for a Surf PI , it is not the most advance metal detect lol i'm no expect by any means, however i'm rather sure the circuit would never be fast enough for the kind of coils KT has in mind anyways! Perhaps KT can post photo's of finish coil that he makes ?

Hi , yes the circular U channel idea is similar to my idea of the flat plates and spacer, might try the bevelled edge spacer plate, but not sure if it will make the offset pattern as it winds,
the offset should make a narrower coil.

[dbanner]

KT is right, this sequence of windings is nonsense. If you want to make flat spiral coil with two layers, just wind the bottom layer first in sequence then make a pass back with the top layer. Then all turns will be consecutive and easy to wind. The concentration of magnetic lines of flux will be the same.

[kt315]

Thanks for your input about fast coils, but this thread is only about the mechanics of winding this coil design, not about fast coils.

The original designer left the forum after some stupid political thread , so I cannot ask him.

no sense to discuss if coil is not fast. i reminder to people a time when they loudly laughed on me if i told about litz in coil.
now they do coils with litz and no laugh.

[Andi68]

Well, the coil is just one component of the detector - what good is a fast coil if the circuit is bad ....
Anyone who thinks independently will do their own experiments and draw conclusions, there is no godparent recipe.
Re-building without knowledge, that is a bad solution ....

[6666]

this thread is only about the mechanics of winding this coil design, not about fast coils.
Built it, tested it, works fine.