Re: Bifilar coil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Mddeming@xxxxxxx 

Hi Sebastiaan,
    Series connected bifilar coils are useful for low voltages only. 
As Tesla pointed out in the patent referred to below, the delta-V 
between adjacent turns of the A coil and B coil is Vin/2. As a TC 
primary with, say 20 kV peak, this means 10kV per turn which could 
easily lead to self destruction. A bifilar secondary could see 150 
kV/mm or more between turns which is a gradient of 150MV/m = instant 
toast of any insulation.
In the patent Tesla seems to be referring to single, self-resonant 
coils, not transformers per se, and definitely not a high-power TC.
Some people have used parallel wound bifilar coils for TC 
secondaries, but any significantly superior performance has yet to be 
demonstrated.

Hope this helps,

Matt D.
In a message dated 8/5/05 1:55:44 P.M. Eastern Daylight Time, 
tesla@xxxxxxxxxx writes:
Original poster: Illicium Verum <sebas@xxxxxxxxxxxxxxxx>


Hello,

I'm wondering if someone has ever experimented with a bifilar coil
and what his or her results were?

This coil uses two wires laid next to each other on a form but with
the end of the first one connected to the beginning of the second one.


Tesla patent 512340
<http://www.keelynet.com/tesla/00512340.htm>http://www.keelynet.com/tesla/00512340.htm


Best regards,

Sebastiaan