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Registered Member #256
Joined:
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Posts: 124
i have heard of camera flash caps being used for coilguns, is this efficient? can i use the original circuit and just discharge the cap across a spark switch into a coil?
Registered Member #81
Joined: Thu Feb 09 2006, 11:57AM
Location: Paris, France
Posts: 43
Camera flash caps can be used for low power coilguns. They store approx. 6 joules. Efficiency does not depend on wich cap you use, just to your coilgun design. Of course you can use the original circuit, a then discharge the cap into a small coil. This was my first approach into coilguns, and I havee used the flash tube soldered on the board as a triggered sparg gap. Perfect, if you don't have a switch, and the slug will be fired with a nice bright flash
Registered Member #310
Joined: Sun Mar 12 2006, 07:37PM
Location:
Posts: 9
Buy some small capasictance 300-450V capacitors (~2000uF) quite cheap on ebay. If you want it easy go for SCRs and make a high current coil ( one stage). That should give you a quite nice coilgun. MOSFETs are better and more efficient but more expencive (i'm building a MOSFET driven one at the moment).
Sorry for my bad english the moment, have consume to much alcohole ;)
Registered Member #256
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lmao too much alcohol well what exactly is an SCR? is it like a transistor? and that is what switches the coil on or off? the one i made had a rewound MOT with an 85 volt ac secondary and i full wave rectified it to charge caps, and then i put the power to the coil through a circuit breaker, i did the ghetto coil gun
Registered Member #310
Joined: Sun Mar 12 2006, 07:37PM
Location:
Posts: 9
streamers rule wrote ...
lmao too much alcohol well what exactly is an SCR? is it like a transistor? and that is what switches the coil on or off? the one i made had a rewound MOT with an 85 volt ac secondary and i full wave rectified it to charge caps, and then i put the power to the coil through a circuit breaker, i did the ghetto coil gun
An SCR is a thyristor . It's like a diod you can turn on and off. In other words a solid-state relay. And yes, that's what switches the coil on and off ALMOST. You can't really switch off an SCR based coilgun so you have to wind the coil equal to the capacistance of your capacitor.
My advice is to make a FET/IGBT based coilgun so you can turn OFF the coil when the timing is right. This way is a more efficient way too.
Registered Member #87
Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
At this point I'd stick to SCR's, they're easy to trigger, and given the right ratings can be put through some brutal discharges. IGBT and FET based systems take alot of tweaking to perfect. Look up 'ohms law' to figure how much amperage will flow through your coil. On a more serious note, lay off the booze, nothing good ever happens when your drunk.
Banned Registered Member #110
Joined: Fri Feb 10 2006, 12:23AM
Location: Banned City
Posts: 85
It will be alot of effort to implement an IGBT controlled cg for beginners not knowing what SCRs are. IGBT control requires SCR control knowledge + more. Otherwise, the IGBT is unforgiving and has a stock count that leaks like a sieve and a mirroring cash deficit. Not a "Re: simple colgun".
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simple coilgun?
