Author Topic: Twin System Build  (Read 183 times)

Offline fnordest

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Twin System Build
« on: July 03, 2019, 01:19:35 PM »
Hi Everyone,

i'm a Tesla addict since 3 years now. Most of the things i have learned regarding tesla coils is from you guys so big thanks to all of you.

My latest project is a twinsystem inspired by Gaos Model82. For now it runs on a IXGN400N60 fullbridge but i will upgrade it as soon as i have the money  ;D
Some specs:

MMC           300nF  /  6kV
BusCap      9000uF 450V
Snubber     2x 2uF / 2kV
Secondary 20cm dia  / 1m length
Torus          60cm outer dia  /  20cm inner dia  / 33mm tubing
Controler   UD2.7
F0               70kHz

Some pics from the build. The case and support for the primary  is made from laminated plywood (Siebdruckplatten)


The bridge is not ideal in terms of low inductance. I will change it to a different design with stacked busbars (turning it inside out  :) ) but for now the ringing is acceptable.



Our first full power test had to be aborted due to bad grounding. We had very weird sounding interferences and huge sparks randomly popping at about 150VDC. At some point we had 2kV on ground potential between the coils  :-\.


Here we are testing the musical setup at 100VDC



As soon as i find a new place to test i will follow it up with some pics in action. If you have any suggestions regarding running two coils at once i would be happy to hear them .

-Cheers







« Last Edit: July 03, 2019, 01:23:21 PM by fnordest »

Offline Mads Barnkob

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Re: Twin System Build
« Reply #1 on: July 07, 2019, 08:03:59 PM »
That is a couple of really good looking coils, I especially like your hexagon base and the way the lids are mounted in a slot in the supports, I would like to steal that idea for a future coil :)

What did you have as "bad grounding"?

Usually when I have interference issues, it has more to do with my interrupter/computer being too close to the coil, I mean if you just have a wire shorter than 5-10 meters to a metal construction, something in the ground, that would not be my first place to look for issues. But for sure, use thin ribbon or multiwire cables with a good large gauge for ground connection to a solid grounding rod in moist soil.

http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline fnordest

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Re: Twin System Build
« Reply #2 on: July 11, 2019, 01:05:42 AM »
Thanks a lot :) i would be happy to see some some parts of the design adapted in other coils.

About the grounding issue: Now i also think it was more of an interrupter issue. We have been maybe 5 meters away from the coils. Usually it is not a problem even that close. After those weird interference i measured the base of the coil and got those huge voltage spikes. I disconnected the interrupter case from the ground but still had the same issues.
Later at home i checked the interrupter again and found one of the poti who control pulselength was kind of broken and one pin had connection to the case. I have another chance to test it on Monday in an old transformer building. I will bring some extra chickenwire with me just in case.

Offline oneKone

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Re: Twin System Build
« Reply #3 on: July 14, 2019, 01:27:18 AM »
These coils look slick! I also have to follow mads.... The clamping method for the clamping plates is an awesome idea. Looking forward to updates.

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Re: Twin System Build
« Reply #3 on: July 14, 2019, 01:27:18 AM »

 


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