Re: Progress on the DC drive

From: 	Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: 	Saturday, January 10, 1998 5:58 AM
To: 	Tesla List
Subject: 	Re: Progress on the DC drive

L.Robertson wrote:

> I see some discussion lately concerning DC drive for coils,
> and thought my struggles with such a drive may be of interest.


> I got a 2 uf 60 kV Aerovox pulse cap. for the storage
> capacitor, and constructed a diode bridge from 30 kV
> 1 amp diodes, carefully placed in a tupperware full
> of oil, and added quite alot of filters between the diodes
> and the Aerovox.
> This resulted in about 12 " sparks, but the safety gap on
> the capacitor started barking at only 25% on the variac.,
> even when opened to 1" .
> O'scope indicated huge 5 Mhz parasitic oscillations.

What are the values in your filter circuit?  A PSPICE
simulation of the interaction between the filter and
primary may be in order.
If you're running DC, you can use an L-diode filter,
which is much more effective and less prone to parasitic 
oscillations than an L-C filter.