Fats coil pdf help

[maca404]

I have been reading the fast coil pdf on the website to get some idea on coil making, I am having trouble with the calculation though. The document says the author wound 19 turns of .024 OD Teflon wire around a 10.5 inch form and ended up with a 300uh coil, The trouble is when I calculate it with the numbers provided it tells me it will be a 227uh coil is there something I am missing ?

[WM6]

I have been reading the fast coil pdf on the website to get some idea on coil making, I am having trouble with the calculation though. The document says the author wound 19 turns of .024 OD Teflon wire around a 10.5 inch form and ended up with a 300uh coil, The trouble is when I calculate it with the numbers provided it tells me it will be a 227uh coil is there something I am missing ?

All is OK, calculations are calculations and real world is real world.

[Qiaozhi]

I have been reading the fast coil pdf on the website to get some idea on coil making, I am having trouble with the calculation though. The document says the author wound 19 turns of .024 OD Teflon wire around a 10.5 inch form and ended up with a 300uh coil, The trouble is when I calculate it with the numbers provided it tells me it will be a 227uh coil is there something I am missing ?

Using 10.5 inches = 26.67cm, and 0.024 inches = 0.61mm, I estimate the coil inductance to be 294uH.
You also need to remember that most coil calculators do not take account of the insulation thickness. Discrepancies can also occur due to coil shape, cross-section and tightness of the wire bundle.

[WM6]

Using 10.5 inches = 26.67cm, and 0.024 inches = 0.61mm, I estimate the coil inductance to be 294uH.
You also need to remember that most coil calculators do not take account of the insulation thickness. Discrepancies can also occur due to coil shape, cross-section and tightness of the wire bundle.

Hi Qiaozhi,

your excellent calculator should be as first (theme or header) in Coils forum, to be constantly available to all.

[maca404]

I second that would be great to have as a sticky

[bklein]

Hi Qiaozhi,

your excellent calculator should be as first (theme or header) in Coils forum, to be constantly available to all.

Any chance you could make it into an ipad app? Accomodate various wire gauge types, inches/mm, coil types, all the good stuff in one app?

[Qiaozhi]

Any chance you could make it into an ipad app? Accomodate various wire gauge types, inches/mm, coil types, all the good stuff in one app?

The coil calculator should execute in any browser, regardless of the platform, as long as it supports Java Script.