RE: Flat bifilar coils

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

Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>

I have recently wound a flat spiral bifilar coil.  I'm still characterizing
it.  So far I have noticed that the magnetic field is strongest in the
center of the coil, instead of in the outer windings as in a regular single
wind or trifilar coil.  The coil I'm working with is poorly wound being
elliptical and has bunched wires on one side.  But if I find anything
useful, I'll wind another one.  I'll report on this as I learn more.

Dave

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Wednesday, February 20, 2002 7:32 PM
To: tesla-at-pupman-dot-com
Subject: Flat bifilar coils


Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Xyme3-at-aol-dot-com>

   Has anyone tried a bifilar coil?  I wound a small one 4" in diameter and
got a magnetic field from just a 9 volt battery.