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Old 01-26-2016, 01:44 AM #1601
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Default Re: Tesla Coil Build Thread

Regarding raising the topload up off of the secondary, this actually causes more stress on the secondary and can cause several issues with performance and longevity if it is lifted too high in regards to the top winding. It helps reduce eddy current losses in the topload to raise it, but really there's no gain beyond that and there are better ways to eliminate topload eddy currents.


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Old 01-30-2016, 05:24 PM #1602
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Default Re: Tesla Coil Build Thread

Welcome to the jungle! After some troubleshooting and some GDT wiring I have arrived here

Last edited by Down with Umbrella; 01-31-2016 at 04:55 AM.
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Old 02-20-2016, 08:56 PM #1603
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Default Re: Tesla Coil Build Thread

I got some more work in today on my big coil's rebuild. This was towards the end of the session, but the bridge and controller are finished now. I just need to make up the LV transformer's power cable and make/attach the resonator's primary.




Also, this happened:
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Old 02-22-2016, 05:04 PM #1604
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Default Re: Tesla Coil Build Thread

Nice : D ,


Heh been there loads of times , the one place I miss is the one place the iron wont reach without melting something ......
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Old 03-06-2016, 04:36 PM #1605
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Default Re: Tesla Coil Build Thread

Mini 10Kv 10mA HV transformer that I'm putting in a 1L pain can under oil , with HV rectifier to use as a HV DC supply , 100M resistor is used to run a 100uA HV meter with 10Kv Scale .

Unit is sealant sealed and glands are sealed as well to give an air tight setup

P1000048 by TwirlyWhirly555, on Flickr
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Old 03-06-2016, 06:14 PM #1606
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Default Re: Tesla Coil Build Thread

ooh, very fancy! More pics!
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Old 03-16-2016, 08:04 PM #1607
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Default Re: Tesla Coil Build Thread

Thanks , but unfortunately that transformer was a flop , didn't work very well , So I now have two 25mA 10Kv NSTs .

I do have a question , I made a marx with 12 stages and 2Mohm resistors / input resistor is alos 2Mohm on the positive side
I made a DC rectifier for the NST using 8 4Kv 250mA diodes per string ( 32Kv Peak revers rated total )

This was then potted in wax , but after about 8 shots of the marx one string whent short :/

I'm not sure if this was over voltage or not , it dosent seem it could be current related , even with 2Mohm input on the marx supply current shoundt go past 5mA but there is no 2Mohm resistor on the negative return so that may be the problem ?
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Old 03-16-2016, 10:36 PM #1608
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Default Re: Tesla Coil Build Thread

Did you tie the rectified negative line to ground?
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Old 03-17-2016, 07:29 AM #1609
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Default Re: Tesla Coil Build Thread

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Originally Posted by Sigurthr View Post
Did you tie the rectified negative line to ground?
I haven't , No

The transformers still has the ground fault protection , so wouldn't doing that cause it to trip ?


Edit : I have looked around online and didn't find any mention of trying the rectifier negative to case ground but I did see people using large input resistors to the Marx - 5-25Mohm .

Edit 2 - rebuilt it with 4Mohm on the positive side , 2Mohm on the negative and its working with it firing every 2 seconds or so @ 10Kv in

Edit 3 - Yup , 11cm Spark


P1000094 by TwirlyWhirly555, on Flickr

P1000095 by TwirlyWhirly555, on Flickr
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Old 03-18-2016, 12:12 AM #1610
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Default Re: Tesla Coil Build Thread

Glad to see you've got it all sorted out!
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Old 03-20-2016, 08:17 PM #1611
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Default Re: Tesla Coil Build Thread

Hi guys!

Here is my DRSSTC. CM600 full bridge. Slightly modified UD 1.3b. Photos are 340V on the bridge, around 500A primary current, 240bps and 190us on time. It makes 4-5 feet of spark until I redo my bus cap configuration.




Thanks for looking!

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Old 03-22-2016, 06:05 AM #1612
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Default Re: Tesla Coil Build Thread

Very nice! What controller are you using?
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Old 03-22-2016, 06:21 AM #1613
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Default Re: Tesla Coil Build Thread

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Very nice! What controller are you using?
Thanks! I am using Steve's UD 1.3b. Unfortunately, without phase lead I am switching about 70 degrees too late! Nasty spikes on the bridge output!

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Old 03-23-2016, 12:45 AM #1614
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Default Re: Tesla Coil Build Thread

IIRC phase lead is easy to add though. Check 4hv for specifics. I think it's just an inductor and maybe another supporting passive.
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Old 03-23-2016, 03:57 AM #1615
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Default Re: Tesla Coil Build Thread

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IIRC phase lead is easy to add though. Check 4hv for specifics. I think it's just an inductor and maybe another supporting passive.
I did try that, it didn't do much though. The 7414 has too wide a hysteresis band(it did work for some people though) so the newer drivers use a comparator. Hmm...

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Old 03-23-2016, 01:00 PM #1616
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Default Re: Tesla Coil Build Thread

That is b-e-a-utiful upaa27 .

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