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4hv.org :: Forums :: Tesla Coils
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Small QCW

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Aragorn
Sun Jun 07 2015, 09:14AM
Aragorn Registered Member #18516 Joined: Sat May 18 2013, 09:09AM
Location: Lancashire, UK
Posts: 38
I would have thought the on-times were too long to create DRSSTC style music when in QCW mode.

Each bang is 10ms long vs say 100us in a DR?
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loneoceans
Sun Jun 07 2015, 07:25PM
loneoceans Registered Member #4098 Joined: Fri Sept 16 2011, 09:26PM
Location:
Posts: 236
Intra wrote ...

Hi Gao,

Did you played some music through your QCW? does your buck-modulator and interrupter allows playing music?

I haven't made a music controller made for the QCW but the modulator accepts any sort of signal input, so yes should have no problems playing most sorts of music. Would probably work great with the bass notes :)
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loneoceans
Mon Jun 15 2015, 08:03PM
loneoceans Registered Member #4098 Joined: Fri Sept 16 2011, 09:26PM
Location:
Posts: 236
Alright I think performance for this coil is more or less near what it can do for now :). Here are the results:

- Spark length just over 70" to air!
- Secondary coil winding: 5.5" with FAT TOROID
- Primary Current 145 to 160A depending on spark

I'm also running out of bus capacitance, so I'm limited to a ramp of just over 300V with 400V on the bus. Here are some photos for your enjoyment:

18218667063 3660e9da42 Z

18834149752 1757a81088 Z

I also tidied up everything into a reasonably compact box so now it's not just a mess of wires on the floor. amazed
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Justin
Mon Jun 15 2015, 11:23PM
Justin Registered Member #46164 Joined: Wed May 07 2014, 08:16AM
Location: California, USA
Posts: 89
Wow, that's a great shot. It's amusing to see these enormous sparks coming from a tiny secondary. High speed footage of the spark formation would be great.
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kilovolt
Tue Jun 16 2015, 11:28AM
kilovolt Registered Member #2018 Joined: Tue Mar 10 2009, 09:56AM
Location: Switzerland
Posts: 74
Very amazing results, loneoceans! Really great work amazed Thanks for posting the pics and the docu of your work.

Best regards
kilovolt
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zzz_julian_zzz
Tue Jun 16 2015, 11:37AM
zzz_julian_zzz Registered Member #3964 Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
WOW! :D cool results Guangyan!
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loneoceans
Sat Jun 27 2015, 08:04PM
loneoceans Registered Member #4098 Joined: Fri Sept 16 2011, 09:26PM
Location:
Posts: 236
I did a write-up on this coil. Hopefully it'll be useful to everyone! Still working through it, so let me know if there are any mistakes.
QCW 1.5 Writeup page: Link2

18839344045 Feebb336a9 Z

I managed to get a lucky single shot photo which shows the spark climbing up very straight.

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zzz_julian_zzz
Sun Jun 28 2015, 12:11AM
zzz_julian_zzz Registered Member #3964 Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
Hi Guangyan,

Thanks for this wonderful documentation :) Hope this helps with other QCW triers around the net :) really great page indeed!
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RateReducer
Sun Jun 28 2015, 04:30PM
RateReducer Registered Member #4603 Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Wow this is really cool stuff! cheesey
So the bigger topload increased streamer length?

I also wanted to try that but unfortunately i killed my QCW coil some time ago -__- Did not try to much to bring it back to live since then... Need to do that in the near future! I just tried a different primary tap to see if it increases streamer length. After a few bursts the coil died quiet and the electrolytic caps in the buck stayed charged so i guess the bridge and the buck are still alive.
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omegalabs
Thu Jul 02 2015, 09:55AM
omegalabs Registered Member #1521 Joined: Thu Jun 05 2008, 10:46AM
Location: Hungary
Posts: 128
Looks really nice.
Looking at these highly coupled coils, isn't it possible to build a QCW magnifier and make the coupling even higher and a smoother E field without the danger of a flashover?
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