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RE: [TCML] DC tesla coil
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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