Re: diode used against RF? (fwd)

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Original poster: Tesla List Moderator <mod1-at-poodle.pupman-dot-com>



---------- Forwarded message ----------
Date: Wed, 6 Dec 2000 23:37:58 EST
From: Pyrotrons-at-aol-dot-com
To: tesla-at-pupman-dot-com
Subject: Re: diode used against RF? (fwd)

<< i was wondering if a diode could be connected in series with the NST. this 
would rectify but wouldn't really affect the charging of the cap
there wouldn't be any frequencies from the primary circuit getting into the 
secondary of the NST...has anyone tried using a diode???
any promising results?? thanks in advance.
M. Bains >>

Hi M. Bains and All.

I can almost guarantee that a *typical* diode or rectifier would immediately 
fry in this application.

A string of diodes in series to is required to get the voltage rating up. 
(you're not going to find a 30kV diode...the highest I've seen in a single 
package is 26kV) Anyhow, if you did this then you'd just be making a DC 
coil....and a number of people have done it. I don't know the overall V 
rating of the diode stacks they use, but it must be pretty dang high. I know 
that people have killed these expensive diode stacks, too.

I imagine the diodes would protect a transformer fairly well.....that is if 
the diodes can live through it themselves. Does anyone have input as to how 
well a transformer will live in a DC coil? I'm thinking a long time, as the 
rectifiers won't pass current (kickbacks from the coil) when reverse biased. 

I'd say it's a good thought, and it does work to my knowledge. (I know the DC 
setup works, but I'm not sure about the transformer protection idea).

Justin Hays
KC5PNP
Email: pyrotrons-at-aol-dot-com
Webpage: www.hvguy-dot-com