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Re: Question about capacitors for coil



Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi John,

I have had many 4 x 20 coils and I loved them all!! Stay with the 4 inch form, wind it to 20 inches with say 1/2 inch extra tube on the ends so 21 inches total. Any good "plastic" coil form will work fine. Rub it with alcohol to remove dirt first, but it is tall enough that it does not matter much. Keep lot of pieces of masking tape handy during winding to lock the winds down as you go. Wind the wire sort of "tight" (but no where near breaking the wire), since temperature and humidity tend to loosen the turns over time.

#28 wire like you have winds roughly 73 turns per inch so that is 1460 turns which is perfectly fine. More importantly the inductance is 39mH which is "just right"!

The 4 inch secondary will couple well and the 20 inch height will avoid primary to secondary arcing.

It will tune into the 160kHz range which is "just right" too...

Such a coil will work with a very wide variety of "everything else" so you can't go wrong.

Cheers,

        Terry


At 04:55 PM 10/2/2006, you wrote:
Sorry for asking so many questions.... I am limited on resources and want to /try/ and have a good design as my first coil.

So 4" diameter and 28g wire.... 1000 turns gives me (about) 13.7 in height which is really squat. This should give me decent results? Because 14" is quite far rom what Dr. Resonance said about 24-26" with 30g wire....which would obviously be way more turns.....