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Re: Terry's GM HEI Coil Update.
>Original Poster: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
>
>
>> Original Poster: "James" <elgersmad-at-email.msn-dot-com>
>>
>> The only thing you would want to stack primaries for is increasing
the
>> primary's frequency responce, because you can almost double the resonant
>> frequency.
>
>You have checked this in practice of course?
>
Yes, I have a tape wound toroidal core, with six independant primaries
of the same turns ratio in respect to the secondary. I could run 1 MHz with
all of the primaries in parallel with less than a 23% loss due to the core.
The turns ratio was 1 to 5 point something. I still have it mounted to a
perfboard, it's almost six inches in diameter, and wound on what was a
current transformer toroid. 1.67 mH, 1.78 mH, 1.62 mH, 1.62 mH, 1.59 mH,
2.13 mH, and 57.5 mH. I guess that the tension on the windings can make a
big difference in the primary windings, because there are so many, and I
don't know how I wound up with 2.13 mH on that thing, because I counted the
windings for each primary, unless that could be the middle of the 57.5 mH
wound over it, and a little mutual inductance, and capacitance giving me a
false reading at that point.