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Re: SCR driver coil concept

At 07:36 PM 1/30/99 -0700, you wrote:
>Original Poster: "becyn comunication" <becyn-at-hotmail-dot-com> 
>
>To Eddie B, et all:
>   
>   I have built a few small magnifier type coils with solid state
>drives. Mostly these were at rather high frequencies by classical
>Tesla standards (> 800KHZ). However I believe the same principles
>would apply to your coil.
>
>   Impedance matching the primary to the base resistance of the
>resonator (at resonance) will ensure maximum power tranfer. High turns
>ratios don't get the job done. If you think that an arbatrary base
>voltage whipped up by a high turns ratio will result in an even 
>higher voltage at Ctop-think again!

 I'm with you 100%! When feeding the base of a maggie, it is desireable to
pump in as much current as possible. Higher Q output resonators mean a lower
impedence at the base. It is possible to increase the turns ratio to gain
voltage at Ctop but only if you have more power to feed the primary! For a
given input there will be a turns ratio for an optimal match.
 I've messed with some pulse transformers to the point of frustration, so
now I'm think of a different scheme. My current thought is to have an
intermediate matching circuit between the primary tank circuit and the
output resonator. Here is a diagram: 


_____/ ____L2_________L3______
   |    |       |          |
   C1   L1      C2         Ctop
   |    |       |          |
  ----------------------------
      |
    -----
     ---
      -

where L1,C1 is the very low inductace high capacitance, high current tank.
L2,C2 is a series tuned matching circuit with L3>L2>L1 and C1>C2>Ctop. The
tuning and interactions in this circuit could get ugly but the pulse
transformers got ugly so here I am!


Eddie Burwell





>   I have empirical results that proves otherwise! There are those
>very respected members of this list that will say "forget radio 
>engineering principles" when dealing with Tesla circuits, but in this 
>case the concept of matching comes in handy. To offer an Olive branch, 
>lest I get flamed to toast-I will add that it's not a completely 
>conventional match where critical coupling would be considered at the 
>driver coil. Ironically the SYSTEM k falls into
>conventional range parameters.
>
>Jim McVey  
>
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