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PRIMARY??
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From: FutureT [SMTP:FutureT-at-aol-dot-com]
Sent: Monday, March 23, 1998 10:23 AM
To: tesla-at-pupman-dot-com
Subject: Re: PRIMARY??
In a message dated 98-03-22 11:45:34 EST, you write:
<< > I was sitting here looking through my e-mail from the list and thought
> of a question about the primary. I have heard before to aleast leave an
> few extra turns for tuning purposes, but can there be to many turns?
> What I mean is that if you have a coil that tunes in at say 5 turns and
> your primary consists of 15 turns. Will having these 10 extra turns be
> lossy to the coil? It in a way seems like it might because it isn't
> concentrating to only those 5 turns. Take for instance this, your
> primary is tapped at turn 5, regardless of this tap I am assuming there
> is voltage still at the outer turn, so wouldn't this be some sort of a
> loss to the amount of energy being transfered? Is this a valid
> assumption?
>
> Chris Jones
>>
Chris,
Although it is better to not have too many unused primary turns, I
often tap my 42 turn primary at the 16th turn when I use a larger cap,
(primary is close wound # 12 pvc ins, wire). As long as I limit my
spark length to about 50", I don't get any arc-over problems. At
higher powers (over ~900 watts), it does become harder to insulate
the unused turns. The unused turns don't seem to be harming the
efficiency of the coil to any objectional degree.
John Freau