Re: Tesla first start up problems. (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 11 Dec 2006 12:25:50 EST
From: Esondrmn@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: Tesla first start up problems. (fwd)

 
Trevor,
 
Your primary and secondary are not in tune.  I made some wild guesses  about 
some details that you did not provide and calculate that you need about  .015 
ufd of primary capacitance with the primary tap set at turn 10 and .00755  ufd 
with the primary tap set at turn 14.  I believe beer bottle caps only  yield 
about 600 to 700 pf each.  So, at most you have only .0042 ufd with  six 
bottles.  You need to at least double this and even then it will  just barely be in 
tune using the full primary.  Instead of adding six  more bottles, it would 
be better to add about 10 to allow room on the primary  for tuning.
 
Ed Sonderman
 
 
In a message dated 12/10/2006 12:09:17 PM Pacific Standard Time,  
tesla@xxxxxxxxxx writes:

Hi  Guys,

I am new to this mailing list but I was hoping that someone might  be able to 
help me out with some problems I am having with my newly built  tesla coil.

A rough spec of my coil is as follows,

15KV 30ma  NST
14 turns on the primary, 1/4in copper tubing spaced at 1/4in
6 inch  diameter secondary, 24inches of windings, approx. 900 turns.
4 inch topload  made from aluminum tubing
Beer Bottle / salt water cap. 12 bottles, approx  0.1uF

I checked and double checked everything and then decided to run  it outside 
at night.  The spark gap was sparking with a considerable  amount of power 
however that was all that was happening.

I took the  top load off at one point and left just the end of the secondary 
winding  sticking up.  When I did this the end of the wire had a slight 
corona  and about a 1/4 inch spark emitting from it.

There were no coronas in  the beer bottle cap even though I didnt suppress it 
with oil yet.

I  tried tuning it and tried running it on about every turn of the primary.   
It just seemed to be really lacking in power.

Any advice would be  most helpful.  I would love to get this coil going!

Kind  regards,

Trevor