Re: Vacuum jar rotary spark gap / thyratron (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 16 Aug 2007 20:27:49 -0600 (MDT)
From: Chip Atkinson <chip@xxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Vacuum jar rotary spark gap / thyratron (fwd)

My rotary gap is totally enclosed in plexiglas and lexan.  1/2" lexan on
the "periphery" and 1" plex on the sides.  You can see pictures of the
mechanism on "my rotary gap" on http://www.pupman.com.  

The gap is pretty quiet.  Parallel pipe static gaps are pretty quiet as
well.  The noise from the gaps are totally drowned out by the noise of the
streamers.  

Others can comment on my comment, but I speculate that ionizing the
atmosphere around the electrodes wouldn't really do that much.  I'd just
go for the totally enclosed rotary like I have. 
As I said, it's really quite quiet, and is easily drowned out by the
streamers.

Chip


On Thu, 16 Aug 2007, Tesla list wrote:

> 
> ---------- Forwarded message ----------
> Date: Thu, 16 Aug 2007 19:07:06 -0700 (PDT)
> From: Timka <tomasdoc2002@xxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Vacuum jar rotary spark gap / thyratron (fwd)
> 
> Good idea, unfortunately it's the neighbors that complain since I tend to
> experiment after work around 11pm.
> 
> Another option is to buy cheap spark gaps enclosed in a glass tube, but
> they are not variable and therefore it is impossible to adjust them unless
> using a very strong ionization source shining between gap.. hmmm
> 
> Here is an idea.. how about using a fixed enclosed glass spark gap with
> external x-ray lamp shining on the spark gap electrodes as ionization
> source? Of course it would be bulky but.... should be silent. Is it
> possible to adjust output of X-ray tubes? Obvious the amount of ionization
> can roughly adjust the rate of "breaks".
> 
> 
> Tesla list <tesla@xxxxxxxxxx> wrote: 
> ---------- Forwarded message ----------
> Date: Thu, 16 Aug 2007 15:20:33 -0500
> From: Drake Schutt 
> To: Tesla list 
> Subject: Re: Vacuum jar rotary spark gap / thyratron (fwd)
> 
> Uhm nice "headset" type ear protection would save your ears and be a lot
> cheaper and easier than some crazy spark gap.
> 
> drake schutt
> 
> On 8/16/07, Tesla list  wrote:
> >
> >
> > ---------- Forwarded message ----------
> > Date: Thu, 16 Aug 2007 12:15:16 -0700 (PDT)
> > From: Timka 
> > To: tesla@xxxxxxxxxx
> > Subject: Vacuum jar rotary spark gap / thyratron
> >
> >
> > Anyone tried before to make a vacuum jar rotary spark gap?
> >
> >   I have a nice deep vacuum pump and I'm thinking to make a rotary spark
> > gap using 10,000 rpm hard drive motor with attached tungsten electrodes.
> > Everything will be assembled and placed under a thick and large plastic jar
> > from which I would pump all the air away.
> >
> >   Since that motor is DC I can change RPM with voltage and it also has a
> > nice Hall sensor build in, which I can use to monitor RPM with external
> > meter.
> >
> >   I'm doing it because I'm tired of spark gap noise, so I think that if I
> > create above mentioned enclosure it would help to ease stress to my ears.
> >
> >   Any suggestions and constructive criticism would be extremely
> > appreciated.
> >
> >   Also,
> >
> >   As a part of tube exercise I also decided to give it a try with
> > thyratrons instead of spark gap. It seems that thyratron tubes are
> > relatively easy to set up as spark gaps using proper drivers. I have a nice
> > thyratron driver (NanoFast 204-7 Trigger 3.5KV). Does anyone know if there
> > any limitations on tubes to be used?
> >
> >   Again, suggestions and constructive criticism would be extremely
> > appreciated.
> >
> >   Many thanks,
> >
> >
> >   Tim
> >
> >
> >
> >
> >
> >
> > Tesla list  wrote:
> > ---------- Forwarded message ----------
> > Date: Thu, 16 Aug 2007 17:00:06 +0100
> > From: Chris Swinson
> >
> > To: Tesla list
> > Subject: safe capacitor discharge times ?
> >
> > Hi all,
> >
> > Was thinking today, Electrolytic capacitor and current ratings. Of course
> > if
> > you wack a screw driver across it, will discharge faster than capacitor
> > rating (10amps is about as good as I have seen, maybe 1amp for smaller
> > values), capacitor will be damaged in anycase trying to give a large high
> > peak amp pulse, could heat up or even explode...
> >
> > so onto my question, if I have a pulse of 100amps, but the rise time is
> > only
> > 1amp per uS, instead of a 100amp rated capacitor, could a 1amp one be used
> > instead ? It would in effect draw 1amp for 100uS for example but has
> > passed
> > 100amps in total.
> >
> > Cheers,
> > Chris
> >
> >
> >
> >
> >
> >
> >
> >
> > ---------------------------------
> > Be a better Globetrotter. Get better travel answers from someone who
> > knows.
> > Yahoo! Answers - Check it out.
> >
> >
> >
> 
> 
> 
> 
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