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4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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First coil gun, 6 cameras, which charge circuit?

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sidneylopsides
Wed Jun 15 2011, 09:40PM
sidneylopsides Registered Member #3690 Joined: Mon Feb 14 2011, 10:59PM
Location: Leeds, UK
Posts: 11
Ok, been quite busy recently, but finally got chance to do some more on this, I have most of it ready, I just can't seem to get the SCR to trigger....

It charges fine, but I can't trigger it. Leaving me with a bank of charge caps every time I try something.
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Artikbot
Wed Jun 15 2011, 09:46PM
Artikbot Registered Member #3247 Joined: Mon Sept 27 2010, 09:42AM
Location: Spain
Posts: 137
You need to feed the gate a small voltage (call it 5V, for example), and an adequate current depending on the SCR itself.


Consult the datasheet, but I'm pretty sure it'll be somewhere around 15mAps max for nominal current.
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sidneylopsides
Wed Jun 15 2011, 09:53PM
sidneylopsides Registered Member #3690 Joined: Mon Feb 14 2011, 10:59PM
Location: Leeds, UK
Posts: 11
This is what it says: Gate V=2v, I=60mA

The thing that is puzzling me at the moment is where does the voltage come from? I mean, all the examples I've seen the gate is connected to the same +ve as the main load, does it have to be? Or can it just be connected to another lower voltage supply.

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Artikbot
Wed Jun 15 2011, 10:01PM
Artikbot Registered Member #3247 Joined: Mon Sept 27 2010, 09:42AM
Location: Spain
Posts: 137
I feed it from another place, in my case my SCRs are fed from the capacitors and the gate is fed from the converter battery, properly regulated to 5V and current lowered to 15mA.


Don't exceed 60mA if you want your SCR to last a couple o' years ;)


You can fire it off a couple AA batteries with a series resistor, for example.
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