Re: how to calculate turns reqd for chokes?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mike Panetta by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ahuitzot-at-mindspring-dot-com>

Thank you for posting this link!  This site will (hopefully) help me
figure out approximately what size coil form, and what size of wire will
give me what inductance coil (hopefully ;) so that I can calculate the
resonance of my coil before I build it.  Did that make sense? ;) 

Thanks,
Mike

On Thu, 2002-07-18 at 12:40, Tesla list wrote:
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Larry,
> 
> See the formulas at:
> 
> http://home.earthlink-dot-net/~electronxlc/formulas.html
> 
> http://home.earthlink-dot-net/~electronxlc/formulas.html#helic
> 
> L=(NR)^2/(9R+10H) is accurate to with a percent and we all use it for
> everything.  But this is for an air core inductor.  If you have a core you
> may have to worry about saturation and other things but L is proportional
> to n^2.  I just cheat and wrap a few turns to test the core and then go
> from there ;-)  I'll let the true transformer design experts here take it
> beyond this.
> 
> Cheers,
> 
> 	Terry
> 
> 
> At 06:38 PM 7/18/2002 +0000, you wrote:
> >Are there simple formulas available to calculate the number
> >of turns required to create a choke of a specific value?  I'd like
> >to read something on the subject that i could absorb to help me, but I'm
not 
> >sure where to look.  I recently posed a question about inductive current 
> >limiting and the most specific answer i received
> >was the inductive reactance formula. (xc=2piFL)  Although that was helpful, 
> >it still leads me with the basic question of ... I have x material which is 
> >an (EI or toroid, etc) core of n size, how many turns of wire and what size 
> >gauge are required.  from the little research I've done,  a handful of 
> >variables are needed and some calculus...
> >I can handle that.
> >
> >plus a knowledge of inductance would be very helpful...
> >i could build/design
> >* chokes for current limiting, chokes for filtering,
> >* chokes for inductance matching of NST to other NSTs (i think u
> >  could do that.) or to tank capacitor.
> >* build my own KICKA** Xfmr.
> >
> >maybe i should change my major from cs to ee/me. this stuff is fun.
> >
> >any thoughts??
> >larry d.
> >
> >
> 
>