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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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Worlds smallest thomson's disk launcher.

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ShawnLG
Fri May 05 2006, 03:47AM
ShawnLG Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
I'ts so small you can build it on your bread board! Nineteen .01uf capacitors are charged to around 690v. Then the three gas discharge tubes will trigger and dump the energy into a small spiral coil form etched on a PCB. The PCB coil form was pulled from a CD rom head lens. I do not know how many turns are there but it looks like maybe 20 to 30. The coil meashures about 5 ohms. The rest of the picture is mostly self explanitory. No expensive pulse capacitors needed.

PERFORMANCE:
When triggered, the piece of foil on top of the coil will jump a few mm. Not impressive, but demistrates Faraday's Law.
1146800847 286 FT0 Microdl
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Simon
Fri May 05 2006, 06:44AM
Simon Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
Not exactly a "launcher" but, wow, is that really 45mJ (millijoules)?

What kind of charger do you use? Looks like a mini tranny run off a single-transistor oscillator or something.
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FastMHz
Fri May 05 2006, 05:10PM
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
That's pretty cool...and proves that they work even when scaled wayyyyy down.
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ShawnLG
Sat May 06 2006, 03:33PM
ShawnLG Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
The charger is like the one you would find in a disposable camera. This one is from a laser printer.

Coilform:
1146929588 286 FT8982 Microcoil
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Electroholic
Sat May 06 2006, 05:13PM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
Where did you get that work coil?
Looks like a planar transformer.
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