Wire gauge ?

[Tinkerer]

Whoops - problem was I also filled in wire diameter -- over-specified! Only fill in red fields is the rule -- probably obvious to anyone with good fashion sense...

(Another rule - in some inputs, must have leading 0 before decimal fractions, e.g. "0.2546", not ".2546"! obvious???)

Now I'm getting a little closer with MiscEl:

Multi-layer, N=111, L=3m, Dmin=260m, Dmax=262m, Inductance= 10.23 (compared to 12.23 measured).

Using "current sheet" formula with same params gives Inductance=10.77.

Let's try tweaking parameters in multi-layer:

Multi-layer, N=111, L=.5m, Dmin=260m, Dmax=262m, Inductance= 12.21 (compared to 12.23 measured). Exact!!! But unrealistic coil length.

So the beat goes on...

Cheers,

-SB

The problem with Misc.El, is that it does so many things, it takes a while to learn it all. And then I am not good at explaining too.

Try your calculation again with Loop circular Simple. Click CONFIG to enter the fill factor. I like to wind magnet wire coils with a polypropylene spacer to reduce the inter winding capacitance. so I use a fill factor of 15 to 30, depending on the thickness of the spacer.

I am working on a new IB coil assembly for the TINKERERS IB-PI. I will show everything with photos.

Tinkerer

[Qiaozhi]

Vista Home was the only choice. I bought this laptop in Switzerland. It has this weird keyboard characters and is all different. Then it suffers from a language problem, it is not capable to work properly with 4 different language software. Bad buy.

I opened your coil calculator with Firefox. The Geotech page took 10 minutes to open, but the coil calculator worked fine.
There is a difference in the inductance, that is probably due to the fill factor that MIsc.El uses.

So the problem is with Google Chrome. For me it is about 5 times faster but it has still a few small problems. It is a Beta version anyway.

Tinkerer

As promised, I've tested the coil calculator with Google Chrome on Vista Home, and it works just fine.
I suspect your problems are related to the fact that you're using a beta version of GC. I downloaded version 2.0.172.28.

You probably have a computer that is underpowered for Vista. Ten minutes to start Firefox is ridiculously slow. You really need a minimum of 1GB of memory for Vista, especially if you want to avoid a lot disk thrashing.

For comparison, the laptop I used has a 2GHz dual-core with 4GB of memory. With this setup, Vista is quite usable. Note that I said "usable" and not "likable".

[Tinkerer]

As promised, I've tested the coil calculator with Google Chrome on Vista Home, and it works just fine.
I suspect your problems are related to the fact that you're using a beta version of GC. I downloaded version 2.0.172.28.

You probably have a computer that is underpowered for Vista. Ten minutes to start Firefox is ridiculously slow. You really need a minimum of 1GB of memory for Vista, especially if you want to avoid a lot disk trashing.

For comparison, the laptop I used has a 2GHz dual-core with 4GB of memory. With this setup, Vista is quite usable. Note that I said "usable" and not "likable".

It took 10 minutes to open the Geotech page. The problem is the Internet connection. The laptop is a DELL, 173Ghz dual core with 2 GB memory.
Google Chrome works much faster. I will try to download the new version.

Tinkerer

[Qiaozhi]

It took 10 minutes to open the Geotech page. The problem is the Internet connection. The laptop is a DELL, 173Ghz dual core with 2 GB memory.
Google Chrome works much faster. I will try to download the new version.

Tinkerer

I assume you meant 1.73GHz.

Your machine should be fine with Vista.

[Fred]

Vista Home was the only choice.

My condoleances.
Qiaozhi, it´sworking fine here with XPsp2 and firefox.
Still have to make coils to check it
Thanks!

[Qiaozhi]

My condoleances.
Qiaozhi, it´sworking fine here with XPsp2 and firefox.
Still have to make coils to check it
Thanks!

Usually I find that the calculator under-estimates the value of inductance. It also depends on how much you tighten the bundle, as this can increase the inductance significantly.

If you are planning to make a DD COIL, then calculate the area within the shape of the D, and calculate the radius [from r=sqrt(A/pi) ]as if it was a circular coil. Then when you reshape it into a D, the coil has the correct value.

If you're making a circular coil, then reduce the number of turns by about 10%.

None these calculators ever give a result that exactly matches reality, but I've found that this one is at least consistent.

[wyndham]

Since I'm still learning much of what is discussed,does the thickness of the insulation change the values or how is this factored in or does it matter? Wyndham
BTW it work fine on win 2000 netscape 9 and firefox

[Qiaozhi]

Since I'm still learning much of what is discussed,does the thickness of the insulation change the values or how is this factored in or does it matter? Wyndham
BTW it work fine on win 2000 netscape 9 and firefox

The thickness of the insulation has only a minor effect on the inductance value. The other parameters, such as coil radius, and how tightly you bind the wire bundle, have the biggest effect. This is why coil calculators are only an approximation. You could build 10 identical coils, but they will all have slightly different inductances.