# equilaterial triangular coil self capacitance

Discussion in 'The Projects Forum' started by pafrazier, Jun 4, 2011.

1. ### pafrazier Thread Starter Active Member

Jun 4, 2011
57
0
Hi,

Can anyone tell me how to calculate self capacitance of an equilateral triangle coil? Or an online calculator that could do that. It would only need to do one turn. There are online calculators for inductance, but could not locate anything for capacitance.

I posted in another catagory as well. New to forum.

Thanks

2. ### beenthere Retired Moderator

Apr 20, 2004
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What does one of these things do? What the the purpose of the triangle shape?

3. ### pafrazier Thread Starter Active Member

Jun 4, 2011
57
0
Hi,

Thanks for responding. I am experimenting with different geometric coils. To see what happens when a charge is applied.

Thanks

Feb 5, 2010
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5. ### pafrazier Thread Starter Active Member

Jun 4, 2011
57
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Thanks Kermit 2 I will check it out.

6. ### retched AAC Fanatic!

Dec 5, 2009
5,201
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Coilcraft makes "square" coils rather than round and gets much better ratings than a typical round wound... Not to mention smaller footprint.

7. ### wayneh Expert

Sep 9, 2010
12,405
3,256
Isn't the capacitance more a factor of the insulation of the coil wire than the coil itself, and whatever shape it may have? I mean, would an uninsulated triangle of wire have any relevant capacitance?

8. ### DickCappels Moderator

Aug 21, 2008
2,785
676
"Isn't the capacitance more a factor of the insulation of the coil wire than the coil itself, and whatever shape it may have?"

When closely wound, the insulation is very important. When "loosely" wound, such as with basketweave winding, insulation plays a smaller role.

"...I mean, would an uninsulated triangle of wire have any relevant capacitance"

That depends on the operative definition of "relevant". If for example, you were to use a single triangular turn of uninsulated wire at 10 cm per side, you would find that is resonates (the inductance and its own capacitance) at some hundreds of MHz.

9. ### wayneh Expert

Sep 9, 2010
12,405
3,256
So, where is the charge stored? Would the capacitance remain in a vacuum (meaning the charge is stored within the conductor itself)?

10. ### pafrazier Thread Starter Active Member

Jun 4, 2011
57
0
Hi,

I am still trying to calc the self cap for equilateral triangle. Thanks Kermit2 for that link. It is over my head. I am a novice.

Dick have been calc come triangles knowing the resistance and inductance and imputing some cap values and am getting rf in 100's of khz. I am trying to get to the self capactance of the triangle itself.

Thanks for all your input any more ideas on calc self capacitance?

Thanks