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RE: [TCML] DC tesla coil: What is a SISG
Hi,
The SISG is an idea -no - a GREAT idea of Terry Fritz:
http://drsstc.com/~sisg/SISG.pdf
Search for SISG on TCML for more info and posts by others who builded and used it.
A triggerable version asks a little more effort from the builder but gives great results.
Couldn't find any schematics, but my version works very well.
It is based on what I read from the posts of Finn Hammer who I believe builded the first one.
Cheers,
Michael.
-----Original Message-----
From: lightningfor@xxxxxxxxxxxxxxxxxxxxxx
[mailto:lightningfor@xxxxxxxxxxxxxxxxxxxxxx]
Sent: dinsdag 7 juni 2011 10:51
To: Tesla Coil Mailing List
Subject: RE: [TCML] DC tesla coil
Hi Micheal,
I have not heard of a SISG...
> I also succeeded in building a triggerable SISG (15 stages @ 1kV each)
and
> I know I'll NEVER go back to a spark gap!
> The triggerable sisg allows me to modulate the streamers (ie music)or
> produce single shots.
Can you tellme what this is, and how it works?
Thanks,
carlos
On Mon, 6 Jun 2011 21:42:46 +0200, "caspina" <caspina@xxxxxxxxx> wrote:
> Hello,
>
The charging inductor I use on my DC-coil is made of 8 conventional
> fluorescent ballasts (58 watt types)in series.
> 1 ballast can take 1.5kV easily.
>
> These ballasts have an air gap. Performance is great, much better then
> with my self-wound inductor (on a MOT core).
> Total inductance is about 5 Henries.
>
> My power supply is 6kV (2 MOT's bridge rectified) and I use 28 caps of
> 220uF/450v in series/parallel for a total of 30uF filtering.
>
> I also succeeded in building a triggerable SISG (15 stages @ 1kV each)
and
> I know I'll NEVER go back to a spark gap!
> The triggerable sisg allows me to modulate the streamers (ie music)or
> produce single shots.
>
> The great advantage of the sisg is that you can work with low voltages
> (relatively speaking, that is)
> and it is less complex then a DRSSTC...
>
> Never bad to read from other coilers, I made my TC reading tons of TCML
> messages, however this is my first post.
>
> Richie's website is a MUST if you go DC-coiling, got great help from
there
> too...
>
> Cheers,
>
> Michael (Belgium)
>
>
>
>
>
> -----Original Message-----
> From: jhowson4@xxxxxxxxxxx [mailto:jhowson4@xxxxxxxxxxx]
> Sent: donderdag 2 juni 2011 8:13
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] DC tesla coil
>
>
> Thanks for the reply's everybody ,
>
> I have read through Richies site a few times and think I have a pretty
> good handle on how it is all supposed to work. But as I usually
encounter,
> it is mostly based on theory and not a lot of actual construction
> practices.
>
> I definitely like the idea of the two gap system and essentially
> eliminating the need for a hefty inductor, Can you provide more
information
> on such a gap. Are the electrodes spaced at 90 deg or are they within a
few
> degrees of each other?
>
> I also do not have access to 3 phase power. I s a filter capacitor
> absolutely necessary? I don't think I could get my hands on a ton of
> microwave caps, and building my own, while not impossible seems
daunting,
> apparently for a max power from the PT I need ~ 1.75uf, yikes! Any
ideas?
>
> Thanks,
> John "Jay" Howson IV
>
> ----- Original Message -----
> From: "S&JY" <youngs@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Wednesday, June 1, 2011 9:17:56 PM
> Subject: RE: [TCML] DC tesla coil
>
>
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf
> Of Jim Lux
> Sent: Wednesday, June 01, 2011 3:50 PM
> Jim - good question. I tried using two triggered spark gaps, but I
> couldn't
> find a way to keep them from firing at the same time--with disastrous
> results--even though the triggers were alternating with lots of dead
time
> between the triggers. So I gave up & used the dual-gap RSG solution.
>
> And yes, for either configuration, filtering the DC power supply is a
good
> idea. I used 24 Microwave oven caps in series-parallel to get the ripple
> down to less than 10%.
>
> Steve Y.
>
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] DC tesla coil
>
>>
>> But if you want to build a much improved DC coil, add a second pair of
>> stationary electrodes on your RSG. One gap charges your MMC, the rotor
>> rotates a bit, then the other gap discharges the MMC into your coil
> primary,
>> and the cycle repeats. This avoids the RSG trailing arcs, allows break
>> rates as slow as you want, protects your DC supply since it is
> disconnected
>> when the MMC discharges into your primary, and allows you to use a
>> simple
>> air core reactor of about 50 milliHenry.
>>
>>
>
> I wonder if you could make a triggered gap version of this?
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