Re: Twin Tesla coils

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Rscopper-at-aol-dot-com>

You can check out my twins at http://www.hot-streamer-dot-com/rscopper/index.htm

The tuning of my twins was a pain in the -at-#$%!!

I thought the same as (Un)Terry about reversing the primary windings, but 
in the end, I had to wind everything in the same direction.  The formulas 
for a "standard" two coil system don't quite work out for a twin system 
either - so have extra primary windings on both for tuning.

R. Scott Coppersmith


In a message dated 4/3/2003 6:15:10 PM US Eastern Standard Time, 
tesla-at-pupman-dot-com writes:



>Original poster: "Terry Oxandale by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <Toxandale-at-spp-dot-org>
>
>To get you started (and I'm setting up a twin at this time, so I'm not an
>accomplished expert in this, yet) you can use identically wound primary and
>secondary coils. My design will tie the two primaries together by a
>connection that goes from the outer-most turn to the other coil's
>outer-most turn (this is how I go about "reversing" the polarity provided
>the two coils are identically wound the same direction). These two
>primaries are then tied to the cap and the SG (series) from the innermost
>turns on each primary. If I've screwed this up hopefully one of the
>"twin-men" will correct me before I go too much further.
>
>(Un)Terry
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Thursday, April 03, 2003 12:58 PM
>To: tesla-at-pupman-dot-com
>Subject: Twin Tesla coils
>
>
>Original poster: "Chris Roberts by way of Terry Fritz
><teslalist-at-qwest-dot-net>" <quezacotl_14000000000000-at-yahoo-dot-com>
>
>
>Hi everybody,
>
>Finally got everything working with the big coil. (a 6 inch secondary may
>not seem big for many of you, but it is for me) I'll post some pictures as
>soon as I can find time again to fire it up. On to the next project... my
>electronics teacher recently acquired a semi-put together coil from another
>school who's electronics class went under (ahh... the wonders of public
>school funding =P ) and had no idea how to make it work. So I decided to
>help him get it working before I graduate. This thing needs ALOT of work, (
>the spark gap is 2 spaced screws, they lost the HV capacitor, primary can't
>be tuned, no topload, etc. ) but the thing I noticed is that they have two
>identical secondary coils. ( I'm guessing in case one ever failed ) So I'm
>thinking of making it into a twin tesla coil system. So I'd like to know
>what is the theory behind twins? The main idea I had about them is that
>they have the same tank circut, but it then splits! off into two identical
>primary and secondary coils. So how do you get the two coils to be 180
>degrees out of phase with each other? Anybody have a link to a website that
>has a schematic or something? Thanks.
>
>
>-Chris