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

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HV Enthusiast
Mon Jul 13 2009, 06:52PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Yes, you can build your own current transformer. A ferrite core with say 100 turns around it should be okay for the feedback. I think Steve Ward used 1:33 and another 1:33 to give 1000:1 ? Check Steve Ward's website for "homemade" current transformers. I always buy commercial since i'm too lazy to design or wind my own.
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Rollingblackout
Mon Aug 17 2009, 03:09AM
Rollingblackout Registered Member #1524 Joined: Sun Jun 08 2008, 05:25PM
Location: Grand Junction, Colorado
Posts: 38
 		Building the MiniBrute was really lots of fun, I want to build another one. I was thinking of selling the one I built to fund the next one. I don't see anyone selling completed tesla coils of any type on the internet, Is there some legal reason for this or is there simply no market?
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HV Enthusiast
Wed Aug 26 2009, 11:30AM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		[MOD NOT]
Please keep responses in this thread on the subject of the miniBrute construction / issues / problems / questions.

Discussion of why i like tesla coils and what i'm build next is not permitted.
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audio:deviant
Fri Aug 28 2009, 04:10PM
audio:deviant Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78
 		got a question about the voltage going into the optocoupler (U42) the HV sample input. how high should this be?

also, im running off 240v uk.. do i need the relay (k121) what does this do exactly? the mechanical side of this is drsstc II but im using all the mini brute boards, have a bigger MMC, and one big 3500uf 450v cap.

cheers gang
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HV Enthusiast
Mon Aug 31 2009, 05:38PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
audio:deviant wrote ...

got a question about the voltage going into the optocoupler (U42) the HV sample input. how high should this be?

also, im running off 240v uk.. do i need the relay (k121) what does this do exactly? the mechanical side of this is drsstc II but im using all the mini brute boards, have a bigger MMC, and one big 3500uf 450v cap.

cheers gang

The input to the HV sample input can be up to 400VDC. HOWEVER! It must be in series with the 25K resistors as shown in the schematic. If you don't run through those power resistors, then you will blow up the optocoupler.

The relay controls the safety bleeders for the DC bus power. When power is removed, the relay turns off and puts the resistors across the caps which bleed them down.
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lhl_henrylui
Thu Sept 10 2009, 10:44AM
lhl_henrylui Registered Member #1498 Joined: Thu May 22 2008, 07:08AM
Location: Hong Kong
Posts: 72
 		What measures should be taken when running the DRSSTC in order to lengthen the DRSSTC's life?
The measures mentioned in the book are too few.
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audio:deviant
Sat Sept 12 2009, 10:40AM
audio:deviant Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78
 		ohhh right cool, thats a good idea! was just looking over the schematics for the mini brute, on the primary coil it says comes from the MMC and then to neutral, is this neutral on the DC power? sorry if that sounds stupid just doing some reseach into the half bridge system.
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HV Enthusiast
Sat Sept 12 2009, 07:36PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Thats the neutral from your AC line.
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audio:deviant
Sat Sept 12 2009, 11:00PM
audio:deviant Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78
 		from the variac? would that not feedback?
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HV Enthusiast
Mon Sept 14 2009, 11:12AM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		The neutral on the DC power is the same "node" as the neutral from your line AC.
However, the tie point would be at the centerpoint of your doubler caps in your DC supply.
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