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RE: [TCML] SISG success
I'd never heard of SISG's till this post - I just read some of the PDFs out there on the subject.
Am I right that this is a "drop in" replacement for the static spark gap in an NST based coil?
I'd be interested in pursuing this (after the VTTC, and DRSSTC of course).
Steve
________________________________
From: tesla-bounces@xxxxxxxxxx on behalf of piranha
Sent: Thu 10/9/2008 11:30 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] SISG success
Hi Herwig,
Happy here to know that your coil is working so well!!
SISGs "rock"!!!
I sort of lost interest in coils after the SISG... I know it will take
others "years" to catch up :D Sort of like landing on Mars while most
are trying to get off the planet :)
But there are folks like you that are the forerunners into the future!!
Best Regards,
Terry
Herwig Roscher wrote:
> Hi coilers,
>
> Yesterday I have maxed out my copy of Terrys wonderful Piranha
> system:
> (c) = calculated (m) = measured (r) = rated
>
> No_load_output of MOT = 3367 V peak (m), MOT gets warm only a little
> bit.
>
> Firing voltage of 2 boards SISG4 set to 6900 V (r), IGBTs remain
> stone cold even without cooling fan and even at max current.
>
> Primary coil: inverted cone type, 25 deg (laying around), minimum
> horizontal distance between primary and secondary coil is 1.26"
> Lp = 13.7 µH (c)
> Cp = 162.5 nF +- 5% (r)
>
> Secondary coil: 6.3" by 22.8", 1360 turns, wire about AWG 27,
> lowermost turns of primary and secondary coil are in the same plane,
> F res = 106.5 kHz (m) when sitting inside the primary coil
> Ls = 73,5 mH (c)
> Cs = 10.6 pF (c)
>
> Toroid 4.33" by 19.3" (outer dimensions) dryer duct (laying around),
> covered with aluminum foil, vertical distance between toroid and
> uppermost turn of secondary coil is 3.75"
> C top = 20.7 pF (c)
>
> I have increased Cp step by step , carefully retuning the system
> after each step of course. Finally I reached a strike distance of
> 35.5". Although I am very satisfied with this good running system, I
> would like to come a bit closer to the magic 42", Terry has reported:
>
> The toroid is smooth (not so smooth as a spun one) and maybe a little
> too small, but as it generates *one* streamer mostly, I assume it to
> be close to optimal.
>
> The streamer length *decreased* when I lowered the firing voltage of
> the SISG4s to 6600 V = increasing BPS.
>
> As the SISG4s continued regular firing when I increased Cp, the MOT
> seems to be able to charge the 162.5 nF Cp up to full voltage.
>
> As the calculated(!) peak current is close to 750 A already I did not
> dare to increase Cp further more. Cp consists of several groups of
> capacitors which are connected with thick but long wires. Some of the
> capacitors are removed from a Klystron-power supply and get warm a
> little bit. Could ESR and wire resistance be responsible for a lower
> primary peak current, lowering the strike distance? Are there any
> other measures I could try in order to increase the strike distance a
> little bit?
>
> While copying Terrys Piranha system I have learned a lot and running
> it is great pleasure. Thank you for inventing it, Terry!
>
>
>
> Bye Herwig
>
> ----------------------------------------
> Greed is the root of all evil !
> ----------------------------------------
>
> _______________________________________________
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> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
>
>
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