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Wirenut

Tue Feb 05 2008, 01:33AM

Registered Member #141 Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96

50 bux for those Cap... jeez. Maybe ill stick with the current design, I'm just afraid of melting my current caps.
Wirenut

Yeah, they are expensive caps. I had 20 of them on hand from previous spark-gap coils. Dan's MMC design really should work fine as long as you cool them properly. I honestly would focus most of the airflow through the caps and worry about the bridge second. The super-beefy heatsinks from barredboss don't even get warm, and I don't think any of the IGBTs I've killed were from overheating.

*edit* I just saw the pics. The heatsink has fins running the other direction, so you may want to turn the bridge 90 degrees.

kwinchee

Tue Feb 05 2008, 12:18PM

Registered Member #1287 Joined: Mon Feb 04 2008, 11:03AM
Location:
Posts: 15

Not to sound cheap or if its an embarrassing quention
What has it cost you so for to build the coil

With and without factoring in the book and PCBs

Wirenut

Tue Feb 05 2008, 04:59PM

Registered Member #141 Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96

What has it cost you so for to build the coil

It's hard to say exactly, as I bought parts from so many different sources. I am pretty sure it was more than 1k.

Reaching

Tue Feb 05 2008, 05:42PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

yup. nice work has its costs :P

i wouldnt worry much about the caps. i dont think you want to run that thing for hours, and all my drsstcs had mmcs without forced air through them and i never wracked an mmc due to overheating.
the cornell dublier caps are not much better than wima fkp1 caps you get here in germany. for a mmc like yours with wima caps you pay around 10 to 15â‚¬ around 20bucks. 50 bucks are way too much for this small sized mmc..

but i dont know, i have no experience with cornell dublier caps, cause they are hard to get here and i have no need for them. wima caps are high tech compared to this selfmade looking roll cde caps.(sorry, but here in germany you wont find any cap manufacturer who declares rolled caps for pulse applications)

for the price of cde caps you can buy wima snubbers with fat leads and mashine screw terminals, rated for extreme pulse applications.

Austin

Tue Feb 05 2008, 10:06PM

Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251

kwinchee wrote ...

Not to sound cheap or if its an embarrassing quention
What has it cost you so for to build the coil

With and without factoring in the book and PCBs

I have prob put about 1k into this whole thing, thats including the boards and books tho...

Ultra7

Fri Feb 15 2008, 02:28PM

Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307

Okay, Austin, I'm getting worried about ya bro.
I haven't heard any progress on the Minibrute in a while.

Just got my tax return and am ordering up all the machine hardware from McMaster-Carr, and I plan on getting the Digikey components once my Local electronics supplier can give me a quote to see if they can beat them.

Hey EVR, I noticed that the parts list in the books might be off a bit, do you have an updated list?

Also, here is a list of prices of Toroids from Ross Engineering, cliped from my email.

Mike from Houston , Texas here.
Building some gadgets down here, and was wondering, what are the prices of the following toroids with both satin and polished finishes?

PER SET OF 2 UNWELDED HALVES-SATIN FINISH ONLY

T126 2.36/12" $167
T201 3"/21" $255
T220 4"/"12 $268
T251 5"/15" $308
T290 6"/18 $362
T301 6"/24" $418
IN STOCK TO 6 WEEKS

Egad, thats expensive.

HV Enthusiast

Fri Feb 15 2008, 08:28PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

I'd avoid Ross Engineering. They are way overpriced, even for a commercial outfit.

Try to see if John Freau has any toroids or make your own. Making your own doesn't look as nice, but it works just as good.

Dan

Ultra7

Fri Feb 15 2008, 08:38PM

Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307

Yeah, the one for my SGCT is 2 Stainless steel pie pans with Al drier duct. Works like a charm.

Wirenut

Fri Feb 15 2008, 10:40PM

Registered Member #141 Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96

Try to see if John Freau has any toroids or make your own.

John F. is futuret at aol.com - I bought my toroid from him - highly recommended. There are some decent looking 3x12 toroids on ebay

Okay, Austin, I'm getting worried about ya bro.
I haven't heard any progress on the Minibrute in a while.

Don't worry, he hasn't given up - he had mid-terms last week and was busy. I believe he's working on the secondary and interrupter.

I'm going to a friend's house tonight with my coil - will try to get some better and longer video footage and some new pics to post tomorrow!

Austin

Fri Feb 15 2008, 10:43PM

Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251

Sorry Ultra, The reason I haven't posted any updates is simply because I don't have any.

I am all out of money to finish my tesla. I still need a 0-140 variac and an external modulator. I was going to buy Chris Mile's Audio Modulated box, however $800 is a bit out of my price range. I will probably end up getting EVR's Advanced Modulator but again I am still running into that whole money issue.

Last week was crazy also, I had 3 midterms and I was violently ill.

I sent Wirenut a little PM telling him that I wasnâ€™t dead, cause I was trying to avoid double posts.

As far as your toroid issue goes.... good luck getting a hold of John Freau, he has falling off the face of the planet. I got my toroid for $268 on e-bay. Thatâ€™s the best deal I have found so far.

Good luck, keep me up to date!

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