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brtaman Flyback SGTC v.2

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LAN_403

brtaman

Sun Jun 28 2009, 08:08PM

Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247

This is going to be my dedicated project thread, my first real SGTC has come a long way since I joined this forum, wanted to thank you guys for all the help.

Afsgtc

Specs:

Secondary:
W: 3cm (1.181inch)
H: 13.1cm (5.12inch)
Wire: 36 AWG (could be higher but I really don't know -.-)

Primary:
5 1/2 winds
6AWG

MMC:
WIMA FKP1 (great caps)
12kv 3.3nF

Power source:
ZVS Driven Flyback from old TV (12v:120W)

Spark Gap:
Static spark gap (Blower+Sucker) (now AFSG, still in development stage)

k=~0.13
Freq: ~1 MHz (according to Tesla Map based on assumption of 36AWG wire)

The coil itself is still far from being nicely tuned but is getting there. I am in the process of building a rotating spark gap, which I hope will improve performance of the coil. At first I was using a sphere toroid, which gave a nice long single spark

. However, the sphere torroid caused many problems on the secondary ( a constant corona discharge from top turns, which made the coil look like an umbrella and major racing sparks which can be seen in the video), so I switched to a classic toroid shape. The classic toroid got rid of all the aforementioned problems, even though it is of about equal capacitance.

Here is a short "teaser" video.

I will be updating this thread as the project progresses and I finalize the project (going to be boxed).

Slow motion SGTC video (120FPS)

New video (Primary now 6AWG with a much better spark gap)

UPDATE: Added pictures and a slow-motion 120FPS video (gets good from 1:30 on, TC seems to work much better when lights are off?)

Thanks
brtaman

Arcstarter

Sun Jun 28 2009, 08:57PM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

Good job!!!

I have never seen such an efficient ZVS driven Tesla coil i don't think. I have been wanting to make one for quite some time, but i always killed the flybacks because instead of using lower power and driving a Tesla coil, i just did 700 watt arcs :P

brtaman

Sun Jun 28 2009, 09:34PM

Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247

Thanks for your comments arcstarter.

700W? No wonder you keep burning up flybacks. :) The thing I have noticed working on this mini flyback sgtc is that the flyback gets extremelly hot, when the coil is not in at least semi decent tune and this is at the lowly 120w power level, maybe that is whats been killing of your poor flybacks?

Killa-X

Mon Jun 29 2009, 03:52AM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

Nice indeed, I'm using 555 flyback on a 1X6 inch secondary coil, and my max so far is 2-2.5 inches with my leaky leydens.

I hope to upgrade to NST but, Yours is looking very good and long streamers, Keep up the good work!

brtaman

Tue Jun 30 2009, 09:11AM

Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247

Thanks for the comments Killa-X! Commercial MMC caps are the way to go for flyback SGTC's some CDE caps or FKP1 (recomended) will improve output greatly.

EDIT: I updated thread with a slow-motion (120FPS video, gets good at around 1:30, it is memorizing, I can't stop watching it :)) and a picture.

Proud Mary

Tue Jun 30 2009, 09:56AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

A damn good effort, lad! Well done!

brtaman

Tue Jun 30 2009, 06:00PM

Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247

Hey,

Thanks Harry, appreciate it.

I am working on the Rotary AFSG the past half an hour, it is built but needs to be tuned. It either works as rotary SG or static. Only for a second or two did it work the way I envisioned it -.-, gonna have to play around with it a bit. Will post a pic of it shortly.

brtaman

Arcstarter

Tue Jun 30 2009, 06:09PM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

Heh, i am good at making small simple cruddy rsg's :P. I have build more than ten or so, i have destroyed all of them though from stuff falling or a potato cannon being fired at it :D. On MSN i can should you how I made a very simple one that fits in a 1.5 inch PCV tubing, which will shield from flying electrodes... flying and hitting you. Like 1.5 inches wide by 6 inches long.

brtaman

Mon Jul 06 2009, 12:35AM

Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247

Arcstarter, next time I see you on MSN you will show me your plans for the tiny RSG, sounds quite interesting.

The project has been updated, I added 6AWG wire for the primary :) and made a more efficient spark gap. Results seem promising, now all I need to do is a final tune and box the little coil up. Thinking of going with an SISG for this little coil, to get up the max possible efficiency, what do you guys think, what kind of improvement could I expect?

I added a new video to the opening post.

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