Re: Secondary size

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

Original poster: FutureT-at-aol-dot-com 

In a message dated 1/15/04 10:35:04 AM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

>Thank you for the input.
>So why can a small dia secondary handle only so much power?


Small diameter may handle the power, but the coil will need to be
tall to prevent racing sparks as I explained in a different
posting.  A very tall and skinny coil will tend to have low coupling,
and that is undesireable because energy will be transfered too slowly,
permiting great losses to occur in the spark gap during the energy
transfer process.  Also, a skinny coil with thick wire will have
low inductance and therefor a low surge impedance in the primary,
which will cause greater gap losses, thereby causing overall lower
"efficiency".

Double toroid keeps the sparks farther from the ground, and prevents
sparks from striking the ground.  It also adds capacitance.  Double
toroid is especially helpful for short coils.   Usually the lower toroid
is smaller.

I offer three sizes of spun toroids for sale which are often helpful and
useful to use for the lower toroid.

John