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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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Coilgun Triggering Without Battery
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currentkills91
Tue May 10 2011, 06:54AM Print
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		Hey again,

I am currently building a 3 stage coilgun rifle. After winding the first stage and building the triggering system for the second and third stages i decided to test the setup. I threw it together and was firing it and the output went high even when firing at high speeds so i thought i was set to go, but WAIT!!! the switch isnt even on?!! Yeah, the thing was off and my SCR and triggering circuitry is still working, even after removing the battery it still worked shot after shot...anybody know whats going on here??
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Barry
Tue May 10 2011, 11:33AM
Barry Registered Member #90 Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
 		I can't tell based on your description. Can you post a couple photographs and a good schematic?

One technique for figuring out if first-stage firing noise is accidentally triggering subsequent stages, is to hold the firing tube vertically and drop the projectile down the barrel.

Cheers, Barry
"Never put off until tomorrow what you can do the day after tomorrow." - Mark Twain
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Artikbot
Wed Jun 15 2011, 06:48PM
Artikbot Registered Member #3247 Joined: Mon Sept 27 2010, 09:42AM
Location: Spain
Posts: 137
 		Maybe your injector coil isn't on, but power to your triggers is?

Depends on how do you charge your caps the accelerator stages will charge as well as the injection stage.


As Barry said, a schem would help though ;)
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currentkills91
Wed Jun 15 2011, 08:35PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		Here's what i'm trying to say...all of my electronics work without any power to them...my SCR triggers with no gate current, and the output of my comparator goes high...with no battery attached, there is absolutely nothing connected to my circuit (except charging circuitry which is completely separate) and it still all works....
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Artikbot
Wed Jun 15 2011, 08:48PM
Artikbot Registered Member #3247 Joined: Mon Sept 27 2010, 09:42AM
Location: Spain
Posts: 137
 		W-w-what?

Omg. Maybe the magical smoke evolved into some sort of soul O.o



Joking, but it would help if you'd post your schems, so we can see if there's any power coming from any capacitor or something on the boards.
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kimbomba
Thu Jun 16 2011, 12:37AM
kimbomba Registered Member #3854 Joined: Fri Apr 29 2011, 03:45AM
Location: Mexico
Posts: 95
 		maybe is dv/dt triggering your scr if your cap bank is charged.
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Barry
Thu Jun 16 2011, 01:54AM
Barry Registered Member #90 Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
 		I still can't say anything about anything, until you provide some circuit details. Please come back when you have a schematic and photos and details of what you tried, what you expected, and what you actually got.

How to ask smart questions.

K thx! Barry
"In the beginning was the Word, and the Word was 'ARRRRGH!'" - PIRATICUS 13:7
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currentkills91
Fri Jun 17 2011, 10:55PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
 		Triggering Circuitry - you have to click on "Projectile Detection"

I'd upload pictures, but the only camera I have takes jpeg pics, which are not allowed.

It's hooked up the way it should be, and the triggering current for the SCR comes from the supply rails of the triggering circuitry.
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Artikbot
Sat Jun 18 2011, 09:25AM
Artikbot Registered Member #3247 Joined: Mon Sept 27 2010, 09:42AM
Location: Spain
Posts: 137
 		Dunno, I have the exact same design, but adapted to an LM211 and it triggers properly, works only when power is applied and so on.


Maybe the caps on the voltage regulators are very big and they keep feeding the circuit even when power has been cut off?


Also, images need to be uploaded to an external server such as ImageShack, Photobucket, and so on.
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