[TCML] RE: Splicing wires - Secondary Coil

["McCauley, Daniel H" <daniel.h.mccauley@xxxxxxxx>]

Tom,

Thats a very good question, and there are two answers.

1.  If you are running a coil thats MANUALLY tuned, then its perfectly okay to splice the wires together.  I've done this many times from small high frequency coils using 34 AWG wire to large pole transformer coils using 20AWG secondary wire.

2.  If you are running a self-resonant (antenna or current feedback based) coil, then it is NOT recommended to splice the wires.

The reason for this is that with a self-tuning system, there will be some impedance discontinuity at the point of splicing.  And the self-tuning feedback network has a high probability it will detect this continuity and tune the coil accordingly making that discontinuity the node where voltage is maximum.  What happens next is that your coil is now tuned at that point, and high voltage peaks and destroys your secondary at the splice point.

This is one of the drawbacks with self-resonant systems.

Which makes me think, maybe some sort of notch filter in the feedback network would prevent this.   Hmmmm . . . sounds like an idea!

Daniel McCauley
http://www.easternvoltageresearch.com
DRSSTC, SSTC, Flyback Kits and Components!






Alright folks - suppose you are in the middle of winding your secondary and the magnet wire snags and brakes. Or maybe you need 2000' of magnet wire and all you can find are 1000' spools. Or ... etc
 
Let's just suppose that you can't get a continous piece of wire for your secondary coil. What do you do? Can you splice magnet wire effectively and not hurt the electrical integrity of your coil? What are good techniques to splice single strand copper wire? 
 
Thanks,
Tom
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