[Prev][Next][Index][Thread]
Secondary Coil Turns
----------
From: D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Wednesday, June 10, 1998 12:33 PM
To: Tesla List
Subject: Re: Secondary Coil Turns
to: Tesla List & Steve Young
We have approx 30 years of experimenting with different types of coils and
find that a height/dia ratio of 4.5:1 with between 800 and 900 turns seems
to work best in most configurations. Don't know exactly why but it does
work well with these design parameters. As Bart said, stay under 1000 turns
for optimum results. You could run 1500 turns but the RF resistance begins
to get too high. Around 800-900 turns produces a good inductance with
reasonable Q factor and RF resistance to produce great sparks.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: Secondary Coil Turns
> Date: Tuesday, June 09, 1998 11:59 PM
>
>
> ----------
> From: Barton B. Anderson [SMTP:mopar-at-uswest-dot-net]
> Sent: Monday, June 08, 1998 8:22 PM
> To: Tesla List
> Subject: Re: Secondary Coil Turns
>
> Steve,
>
> Tesla List wrote:
>
> > ----------
> > From: Steve Young [SMTP:youngs-at-konnections-dot-com]
> > Sent: Saturday, June 06, 1998 10:45 PM
> > To: Tesla List
> > Subject: Secondary Coil Turns
> >
> > To all,
> >
> > In many postings I have read, the general advise is to not exceed about
> > 1,000 turns on the secondary of disruptive TCs. For example, Bert
Pool's
> > excellent "Building Conventional Tesla Coils" states secondary coils
should
> > be at least 400 turns, but no more than 1,000 turns.
> >
> > Question: If the length to diameter ratio is kept within reason
(3-5:1),
> > why not use 1,200 or 1,500 turns? At least this would lower the
operating
> > frequency which is advantageous, even if secondary voltage doesn't
increase
> > much. Has someone done experiments which indicate about 1,000 turns is
the
> > point of diminishing returns?
> >
> > Thanks in advance for comments,
> >
> > --Steve
>
> Steve, good question. This is one of those grey areas I've also wondered
about.
> I'm suspecting that a coil with say 1,500 turns would build a pretty high
dc
> resistance based on the length and the reduced wire diameter to keep a
coil
> within "ratio's". Probably not advantagous. My secondary using 18awg,
12.5"
> diam., measured 16.2 ohms (calc to be 16.4ohms). I think it wise to keep
the dc
> resistance as low as possible. I would like to comment more here, but
there
> have been some fantastic postings recently which has got me re-thinking
"every"
> aspect of how a TC operates. I hope others comment here and shed more
"spark"
> on the statement of the 1,000 turn limit. Anyone?
>
> Bart
>