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Forums
4hv.org :: Forums :: Tesla Coils
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Minibrute Construction Thread / FAQs

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HV Enthusiast
Sun Apr 20 2008, 05:19PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Very nice!
How long is your maximum output arcs?
You should be able to easily tune for about 36" at only about 120VAC input.
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EdwinWise
Sun Apr 20 2008, 07:16PM
EdwinWise Registered Member #1305 Joined: Sat Feb 09 2008, 10:27PM
Location: IH35 & Parmer, more or less
Posts: 9
 		Right now I'm getting about two-foot arcs (guestimate) with about half of that input. When I kick it up more I explode the fuse in my variac. I'm tempted to just plug it into the wall and see what happens...

It's an impressive little runt of a coil!
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HV Enthusiast
Sun Apr 20 2008, 07:30PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		What size fuse are you using? I typically use a 10A variac, but run a 20A fuse for short durations run time.
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EdwinWise
Mon Apr 21 2008, 10:36PM
EdwinWise Registered Member #1305 Joined: Sat Feb 09 2008, 10:27PM
Location: IH35 & Parmer, more or less
Posts: 9
 		My variac is lame -- a 5A version from Fry's -- and I dropped a 10A fuse into it. The massive coil of wire inductor might be worth trying, or something, or I could try to find a decent variac. From what I've seen, though, they are pretty spendy, even on eBay.
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EdwinWise
Tue Apr 22 2008, 07:14PM
EdwinWise Registered Member #1305 Joined: Sat Feb 09 2008, 10:27PM
Location: IH35 & Parmer, more or less
Posts: 9
 		Ooo, never mind, found a 3kVA variac on eBay, $150 shipped. Not bad.
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HV Enthusiast
Thu Apr 24 2008, 02:44PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Just a comment on increasing reliability for the miniBrute (or any DRSSTC really)

I have found recently through some demonstrations that simply using a long 50ft extension cord in series with your bridge power for the miniBrute greatly improves reliability without sacrificing performance. It doesn't really act like a resistive ballast but rather an inductive ballast. A spool of wire would likely have the same effect.
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Ultra7
Thu Apr 24 2008, 05:00PM
Ultra7 Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
 		So what you are saying is. . .
Hook the variac up with the 50Ft extension cord instead of just straight from the wall?
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HV Enthusiast
Thu Apr 24 2008, 06:13PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Yep, this definitely will help.
I can run my electrodes 1 foot apart from each other at maximum PW and maximum PRF with super hot white arcs with no problems at full voltage this way. The extension cord acts as a poor man's inductive ballast to limit peak current.
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Austin
Fri Apr 25 2008, 12:07AM
Austin Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
 		Great tip thank you! Daniel, I just got all my parts in for the modulator. I start construction this weekend if everything goes well.
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Austin
Sat Apr 26 2008, 09:35PM
Austin Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
 		Sorry for the double post.

Daniel, I'm working on the Xenosonic Audio Interface and i noticed that R56 is listed twice in the parts list. is R56 suppose to be 100k or 1M
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