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Forums
4hv.org :: Forums :: General Science and Electronics
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Camera Flashtubes

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Firefox
Fri Mar 21 2008, 08:41PM Print
Firefox Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
I was playing with a disposable camera today and noticed a small copper wire next to the flash tube that was critical to it flashing. Could anyone tell me what that wire is?
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rp181
Fri Mar 21 2008, 09:52PM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
this is a trigger. A high voltage goes through, ionizes the gas, and allowes the cap to fire. Its several Kv.
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Myke
Fri Mar 21 2008, 09:58PM
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
The trigger is connected to the trigger transformer. They way that works is a cap is discharged into the primary windings which induces a high voltage pule on the output. I think it's around 4KV.
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Ken M.
Fri Mar 21 2008, 11:01PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Myke's explanation is correct as for teh voltage its anywhere between 3K-12K I have 2 10K flash coils that I have yet to use on any project lol had them for years.
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Firefox
Sat Mar 22 2008, 01:49AM
Firefox Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
Yeah, they're scary too. My brother decided to jump it to a ground across a rocket motor igniter. It was like a mini Jacob's ladder until the spark hit the pyrogen. He says he's found his new drag race igniter. angry
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teslacoolguy
Sat Mar 22 2008, 02:43AM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
it pulses a 1kv pulse into the metal reflector that ionises the gas inside the flash tube and triggers it to flash.
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Plasmaarc452
Sat Mar 22 2008, 03:31AM
Plasmaarc452 Registered Member #1394 Joined: Sun Mar 16 2008, 06:18PM
Location:
Posts: 111
Awesome i have wanted to know what that was for, i plan i making some kind of circuits in the future that use the flash ignition coils.
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