star coil

[Andi68]

Yes, inductance plays a big role and something else that I do not know.

A narrow shape is better for tight spaces.

I've noticed that splitting into layers works well on the behavior of the coil

[dbanner]

Magnetic field lines of flux are hyperbola? Just curious. Spiral two dimensional wind translates into what type of magnetic field? Are there any images to compare?

[dbanner]

The star shaped coil reference posted by KT is interesting. It combines the best elements of basket type and flat spiral coil in that it's coverage of entire width of coil plus separation of windings, sort of hybrid.
But I won't be the one that attempts to make it. Looks like for masochistic person to make.

[Koala]

An elliptical shape, rectangular shape ....

Yep tried them all. Its easy to change shape with a bundle of wires tapped together. Watched a YouTube video where they changed a round coil to an ellipse and got more depth.


It was rubbish. Just changing the inductance to better match the damping resistor.

If they had kept the coil as a circle and changed the damping would have had the same result

Or removed a turn or two.

[dbanner]

i had see that but i do not remember where...

https://www.banggood.com/High-speed-...r_warehouse=CN

LOL!

Who's gonna be winding that?
Only one guy I see in movie" Back to the future". "Doc"

[Andi68]

An elliptical shape, rectangular shape ....

[Koala]

I have tried all sorts of shapes for a slow PI (Barracuda) For depth and pinpointing nothing beats a circle. Which is what I expected. Did quite like the triangle. The sharp point should be good around rocks. Difficult to test as you have to readjust the damping resistor after each change of shape. Also you have to have the threshold exactly the same. I had to unplug the batteries as the threshold and on/of were combined.

I reserve the right to change my mind as a star was one shape I didn't try.

[qute1]

i translated and was lost

[Andi68]

I was lost in translation

[qute1]

I did.

[Andi68]

Certainly, test and report ......

[qute1]

Seems to suit the felezjoo just fine gained a couple of inches depth in air and is better on gold ring (it is the stock coil from our friend sinko1) so i don't know about kindergarten Andi68 but as Feynman said The test of all knowledge is experiment. Experiment is the sole judge of scientific “truth”

[kt315]

i had see that but i do not remember where...

https://www.banggood.com/High-speed-...r_warehouse=CN

LOL!

[dbanner]

Maybe the inductance of the original coil has been changed such that it is now more agreeable with circuit. Hence the illusion of better sensitivity.

[Andi68]

I contradict. By such a coil shape, the magnetic field is greatly weakened in my opinion.

Like the basket coil, this is a tinkering for the kindergarten.