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4hv.org :: Forums :: General Chatting
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Post Your Cool Pic Here!

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Hazmatt_(The Underdog)
Wed Dec 31 2008, 09:13AM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
 		It's very nice. To get the most bang for your buck you will need to at least double your toroid, and halve your secondary. I think you have about 1800 turns there and you need to be at about 1200. Your topload should be about 2x your secondary self capacitence.
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Mads Barnkob
Wed Dec 31 2008, 09:58AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		Nice bunker you got in the 2nd pictures :D
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Nik
Fri Jan 02 2009, 07:47PM
Nik Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
 		A spark from my van de graff generator. The sphere is 14 inches wide and the spark is 3 and a half inches to my knuckle. Not the longest spark its made but the longest I have caught on camera.
1230925624 53 FT6000 Longspark2
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aonomus
Fri Jan 02 2009, 10:44PM
aonomus Registered Member #1497 Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
 		I ripped out a pair of 2n3055's that failed likely due to a voltage spike (from disconnecting a large inductive load), here is a pic from inside:

IMG 1172
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Firefox
Sat Jan 03 2009, 12:39PM
Firefox Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
1230986087 1389 FT1630 0103090521


This is my version of Uzzors' SMPs built inside a rackmount PSU case. I think it is probably the best looking (and hence coolest) thing I've ever built, so I posted it here. I still have to work out a problem with the voltage feedback (suspect screwed up TL494 due to accidental 22V on pin 1 while testing).
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Arcstarter
Sat Jan 03 2009, 06:07PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
 		VERY nice Sean! amazed Is that the 15-48 volt supply? I wanted to make one, but just don't have the stuff, or the smarts tongue
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Dr. H.
Sat Jan 03 2009, 09:27PM
Dr. H. Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486
 		Good day sir

aonomus wrote ...

I ripped out a pair of 2n3055's that failed likely due to a voltage spike (from disconnecting a large inductive load), here is a pic from inside:

IMG 1172

this looks like a fake 2n3055 to me. I have opened a dead 2n3055 in the past (Motorola) and the die was "enormous" compared to that (atleast twice as big). No pics thou (pesky dead HDD cry )
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rp181
Sat Jan 03 2009, 09:41PM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
 		nah. The chips are usually under a silicone glob.
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Fabio
Mon Jan 05 2009, 12:13AM
Fabio Registered Member #122 Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
 		Hi All!

A bit off topic here, isn't a picture, is a videoclip:

New year celebrations..... with tesla coil! smile

Link2
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aonomus
Mon Jan 05 2009, 12:57AM
aonomus Registered Member #1497 Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
 		I doubt it was a fake 2n3055, it was from digikey who usually order from manufacturers direct no? The maker was ST Micro, and it wasn't dead cause it was fake, it was dead because it got a voltage spike which broke it :(
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