RE: Bipolar coil question (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 9 Aug 2007 09:27:05 -0500 (CDT)
From: Gerardo Lezcano <lez_gera@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: Bipolar coil question (fwd)

Some time ago, I did a simple experiment.  Take two secondaries, connect their base wires together, using two LEDs in antiparallel.  With only one primary coupled to one secondary, feed with a signal generator.  There is no ground connection.
   
  You will find resonance when the 2 LEDs turn on (although dimly).
   
  Now take an alligator clip and connect ground to either secondary bases.  LEDs will turn off.  I never found the new resonance frequency.  Maybe too low power signal or frequency span of generator was not wide enough.

  It seems to confirm that Earth forces a voltage node on the bottom end of resonator.
   
  I think you cannot treat the two secondaries with center tap to ground, as a common bipolar floating secondary (not earth connected, usually placed horizontally).
   
  I think each secondary should be resonating individually to the primary tank frequency.
   
  If we could resonate both secondaries as a unique L, where each topload is a plate of the C capacitor, then it would be a common LC tank, with only one voltage node, despite we have two ground connections, separated by an arbitrary distance.  Experimentation shows this is impossible.
   
  best,
   
  Gerardo.
  
Tesla list <tesla@xxxxxxxxxx> escribió:
  
---------- Forwarded message ----------
Date: Tue, 7 Aug 2007 13:14:09 -0500
From: Terry Oxandale 
To: Tesla list 
Subject: RE: Bipolar coil question (fwd)

Good question. The answer will help me as well, and with that said,
doesn't each secondary operate independently in resonance, (and not used
as a sum), as compared to the primary (both primary coils are in essence
acting as a large single primary) resonance?

Terry

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx] 
Sent: Tuesday, August 07, 2007 12:37 PM
To: tesla@xxxxxxxxxx
Subject: Re: Bipolar coil question (fwd)


---------- Forwarded message ----------
Date: Tue, 7 Aug 2007 17:41:31 +0100
From: Chris Swinson 

To: Tesla list 
Subject: Re: Bipolar coil question (fwd)

> 
> I'm having a brain fade, and can't jog the information loose in there.

> 
> I'm in the process of building a small bipolar coil (to replace my
> testbed that went up in smoke), and I can't remember...
> 
> Do I calculate Fres of the secondary as a whole (IE, lump both topload
> C's together and do it as one secondary), or do I calculate it as two
> separate coils, with the center point to the ends as the length of
each
> coil? 
> 
> I forget, and I'm at work, so I can't simply throw my signal generator
> on it to see. 
> 
> Thanks!
> 
> Shad H. 
> 



As adding a toroid lowers Fres, there you have your answer.

Chris








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