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Small Tesla Coil using disposable camera transformers

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flannelhead
Thu Jan 03 2008, 11:19AM Print
flannelhead Registered Member #952 Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Please note this coil was built just as a proof-of-concept. Even though this might look like a fancy way for a beginner to get started with high voltage electronics, it is not.

Some time ago I finished an interesting project. It's a small tesla coil running out of four AAA batteries. Here some specs:

Power supply:
-3V in
-two camera transformers
-~660V output to CW multiplier
-CW output ~8000V (6 stages)

Primary:
-1nF 2kV polyester pulse cap
-6 turns of 0.5mm wire
-static gap ~1mm

Secondary:
-~380 turns of 0.3mm wire
-height 135mm
-diamerer 45mm
-no topload

This coil gives some nice ~4mm discharges and ~25mm arcs! It can also light neon bulbs, fluorescent tubes and so on... It's amazing that the whole thing draws only about 1.5 amps so at 3 volts it's only 4.5 VA power!

Some pics and video:

1199359166 952 FT0 Full View

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Mates
Thu Jan 03 2008, 11:36PM
Mates Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
It almost looks like cheating... smile I would never believe you can get so much from such a litle voltage and power...

BTW: I do not see any inverter feeding the transformers. Is it so small? rolleyes
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Capper
Fri Jan 04 2008, 01:18AM
Capper Registered Member #914 Joined: Fri Jul 20 2007, 06:22PM
Location: South Bend, IN
Posts: 85
I need one of those on my desk at work.
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CT2
Fri Jan 04 2008, 07:46AM
CT2 Registered Member #180 Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
The inverter is only that small resistor going from pin to pin and a transistor (on the side of the transformer I think).
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Logan Kennedy
Sat Jan 12 2008, 04:35AM
Logan Kennedy Registered Member #1103 Joined: Mon Nov 05 2007, 06:02PM
Location: Houston
Posts: 80
That's pretty wicked!

What a kludge, but I'm amazed it works...

Show us some arc photos, or record a small movie. I've got to see this thing in operation. :D
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J. Aaron Holmes
Sat Jan 12 2008, 04:58AM
J. Aaron Holmes Registered Member #477 Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Logan Kennedy wrote ...

Show us some arc photos, or record a small movie. I've got to see this thing in operation. :D
He included a movie. Look again wink

Cheers,
Aaron, N7OE
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Logan Kennedy
Sat Jan 12 2008, 05:07AM
Logan Kennedy Registered Member #1103 Joined: Mon Nov 05 2007, 06:02PM
Location: Houston
Posts: 80
OH I see it now, haha!!

Wow, it works, and it's halfway decent. Big surprise!

EDIT: What kind of drive time do you get from those AA batteries? You should probably get some lithium ions for better performance and current! It would also increase drive time drastically.
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flannelhead
Fri Feb 15 2008, 08:42AM
flannelhead Registered Member #952 Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Logan Kennedy wrote ...

What kind of drive time do you get from those AA batteries? You should probably get some lithium ions for better performance and current! It would also increase drive time drastically.
With my 850mAh AAA batteries it runs propably 5min. I have also some nice 2500mAh AA cells, I would've used them but I've currently got no holder for them.
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uzzors2k
Fri Feb 15 2008, 01:28PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Do you have some pictures, I can't get the movie to work.
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flannelhead
Fri Feb 15 2008, 04:33PM
flannelhead Registered Member #952 Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Here's one frame captured and cropped from the video. Notice that the video was taken in a completely dark room and the camera was propably 1.5cm away from the breakout point. The camera was on ISO 400 setting!! The discharges are about 5 mm long.

1203093224 952 FT36853 Discharge
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