Re: Transformerless Tesla coil

["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: "Jolyon Vater Cox by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
> 
> would a common-mode choke help here?
> I understand many people do not like choke filters any more as there is
> evidence that they subject the transformer secondary to high voltage pulses
> that as damaging as the RF transients they are supposed to suppress.

A filter with a common mode choke between the transformer and the gap,
maybe. But insulation would be problematic. A regular filter, RC or RLC
in series with each connection of the power transformer would be more
practical, I think.

There is nothing wrong with using inductors in filters. It's just a 
question or proper dimensioning to get reliable filtering, that is
always better than with resistors (and capacitors) only. Note that
LC filters must include resistors to avoid excessive ringing. There
are, however, problems with insulation in chokes for high-voltage
filtering that are easy to avoid using resistors only instead.

Antonio Carlos M. de Queiroz