Re: tesla coil grounding

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

Original poster: "Black Moon by way of Terry Fritz <twftesla-at-qwest-dot-net>" <black_moons-at-hotmail-dot-com>


Yes. grounding is NEEDED
grounding provides a refrence for the output of the tc
otherwise it does strange things..
like at the peak of a wave, the bottom will be a say -100kv and the top 
will be at +100kv, well, the primary capasatance and such will affect it... 
actualy. I bet the main toriod capasatance would actualy make the top be at 
like 10kv at the bottom be at like 190kv!


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: tesla coil grounding
>Date: Tue, 26 Nov 2002 21:14:31 -0700
>
>Original poster: "george hadle by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><ckreol1-at-yahoo-dot-com>
>
>several questions.
>I have a mosfet driven (protected and enhanced by
>schottky 1206d 's) primary coil of about twenty turns
>of 22 gauge bare copper wire.  A secondary with fres
>of 333 khz.  I have a small heat sink on the fet which
>gets hot; several watts.  when conncting scope leads
>(inductively and directly) to the secondary it is a
>standard rlc ringdown w.f. It is tuned pretty
>precisely. I want to know if the fact that its not
>grounded preventing the existence of an rf envelope
>looking w.f.  I tried varying the coupling.  Why no
>energy exchange between pri and sec??  It's driven by
>a cmos sq wave oscillator.  I know I need to get
>higher current to charge the  fet quickly
>thanks
>george