Re: Low Voltage Tesla Coils

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

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
> 
> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>

>         Schematics of several of the big Marconi spark transmitters (circa
> 1910) showed the use of a cascade of two resonant transformers, with a
> spark gap in the secondary of the first discharging a storage capacitor
> into the primary of the second.  I've never seen a writeup on the
> things, just schematics in the old books, and don't know why it was
> done.  Perhaps a similar setup might work with TC's, and it wouldn't be
> hard to simulate.  Terry?

I have seen this too. The reason was stated as being a "cleaner" output
signal in the radio transmitter (?). It seems possible to make a system 
that would dispense with a power transformer in this way. The first coil 
would be used to produce a reasonably high voltage directly from low
input voltage to charge the primary capacitor of the second coil. 
The operating frequency of the first coil must be lower than the
one of the second coil, otherwise the same problem with inductance
ratio appears.
An old variation of the same thing (maybe what some of the old 
schematics really show) is an induction coil used to charge the 
primary capacitor of the Tesla transformer.

Antonio Carlos M. de Queiroz