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Re: Smoking the Neons!



Dave,
        I won't be able to view your jpgs for awhile, but from your 
description.....

> Something here doesn't seem right. I remember the discussion stating that
> RF going into a neon can cause a 'hot spot' and burnout the winding, but
> one would think that an LC would remedy the situation. I did some spice
> simulations and got some surprising results. (This may be one of those
> theory/actual conflicts.) 
> I have included pictures of the results which can also be found at
> ftp:\\d0huffman.fnal.gov\ftp
> It appears that if a simple RC is placed between the neon and the primary,
> very little of the tank oscillation is seen at the terminals of the neon.
> If the R is replaced with an L, a large oscillation is seen at the neon
> terminals. This lower frequency oscillation could over voltage/current the
> neon and seems to be (Roberts comments below) quite destructive. Even a 1H
> inductor will not help, it may in fact make this worse since the higher
> voltage (now a lower freq.) is there for a longer time.

it almost sounds as though you haven't modelled any inductance for the
transformer? I'll check later.

Malcolm