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Re: LOW VOLUME
Hello all,
Yes there do seem many opinions regarding neon filtering. I had good luck
with 1.5 mH L in series with 1.5 kOhm (50 watt) R and .004 uF to ground on
each leg of a 15 KV -at-120 mA Neon. It pumped out 4'+ streamers from a 4" x
20" tertiary (was a three coil system) for many years (many, many hours!!).
One day earlier this year I hooked it up again, but disregarded the caps.
It lasted for about 15 minutes (total) run time, and then decided to go the
way all neons eventually go (at least IT only cost $5). I also never used
safety gaps, probably would have saved this one (maybe). Also the idea of
having the pri spark gap close and across the neons (or OBIT) legs seems
like good advise. But I now use more robust trany's and am mostly doing
tube work.
Trying not to melt the breaker box,
In Oregon,
David Trimmell
At 10:45 AM 12/7/99 , you wrote:
>Original Poster: Esondrmn-at-aol-dot-com
<<snip>>
>>
>> I managed to fry one of the OBIT's setting the safety gaps, but I've
>> got access to lots more. Is 100 pF. across the safety gaps OK when
>> using a pair of pancake chokes wound of # 22 on a 2" OD teflon form?
>>
>J.B.
>
>There are may opinions regarding filter systems. I would suggest to use no
>capacitors at all. I use series inductors made with about 20 turns of #16
>wire on a ferrite (donut) core in series with the H.V. feeds and then
>directly to the main spark gap. I also use some series resistance on the
>smaller coil powered by neon sign transformers and none on the pig powered
>coil. I believe it is Malcolm that suggests locating the transformer
>physically close to the spark gap and I agree this is the best design. After
>blowing a few caps I also use safety gaps across my caps, although after
>fixing my 60 hz resonant problem I have not had a problem in that area.
>
>Ed Sonderman
>
>