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RE: Double Throw Spark Gap (fwd)



---------- Forwarded message ----------
Date: Tue, 9 Oct 2007 12:43:41 -0600
From: S&JY <youngs@xxxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: Double Throw Spark Gap (fwd)

Adam & all,

I can't speak for everyone, but yes, the circuit works fine.  I have used it
for several years.  

It absolutely doesn't need to charge the tank cap in the same time it is
discharged with the main bang.  If you calculate dwell time, assuming about
a quarter inch gap presentation length at the highest break rate you will
use, you will see that there is plenty of time to charge the cap with a
charging reactor.  With my 12 electrode RSG, at max of 370 breaks per
second, the time to charge the MMC is about 235 microseconds. I use a 112 mH
reactor to charge a 50 nF tank cap. The inductance of the charging reactor
needs to be high enough to limit the peak current to something the de-Qing
diode string can handle.  My peak current is about 8 amps.  I use 40 3 amp
(steady state) 1N5408s in series with a DC supply of up to 14 KV (28 KV as
doubled by the charging reactor) and have never had a diode failure. 

--Steve Y.  

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx] 
Sent: Tuesday, October 09, 2007 6:49 AM
To: tesla@xxxxxxxxxx
Subject: Double Throw Spark Gap (fwd)


---------- Forwarded message ----------
Date: Tue, 9 Oct 2007 03:46:42 -0700 (PDT)
From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Double Throw Spark Gap

I haven't really been following this thread, so
forgive me if this comment has already been addressed.


Regarding the following circuit:

http://tangent.cluenet.org/~chules/hv/tesla/dtsg.html

Does everyone think the cap can charge adequately in
the same amount of time it can discharge? Without
doing the math, I gotta believe that if one set of
flying electrodes zooms around at several hundred rpm,
the presentation time for the charging portion will be
too short to fully charge the cap. After all, most rsg
coils are charging the whole time they aren't
presenting (well not exactly). I guess you gotta know
the dwell time and the size of the pig feeding this.

Adam


       
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