Twin Tesla coils

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

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