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Registered Member #3711
Joined: Thu Feb 24 2011, 12:09AM
Location:
Posts: 4
I’m planning on building a small portable coil gun (Packed inside a pellet gun) powered by a bunch of crappy little 330v 120uf photoflash capacitors, and I’m looking for someone advice so I don’t blow my self up:-D.
My power source is going to be a bunch of AA batteries, or (2) 6v, or a 12v if I can find a small lightweight one that is rechargeable (I also want to be able use a 18.5V laptop power source and just plug my gun up via the wall so I don’t blow a ton of money on batteries) Anyways either the batteries or the laptop charger will plug into an inverter that I kinda stole from my moms car, she thought it was broken but it was just a blown fuse. This is the inverter ( Input: 10.7-15.5vdc 70watts – Output 110/120vac. Then I want to use a voltage multiplier to increase the 120vac to 280-330v dc using a rectifier after to charge the caps. Also, I was planning on running a small fan to keep everything cool inside my gun enclosure.
My questions are:
1. Will this even work? 2. Which is the best method for powering up the gun AA’s, 6v’s or a 12v? and will the inverter drain to much out of the batteries? 3. Can I use a voltage multiplier to increase the 120vac? and how? Or should I step the voltage up with a transformer? 4. Can I use a rectifier to change the AC to dc at that high of a voltage? 5. Can I separate some of the output voltage of the inverter to power some of the output voltage of the inverter to power my fan, and maybe an optical trigger device for a second stage? I’m not that experienced in electronics as you can tell, and I know this is a dangerous build!ill. But any help would be greatly appreciated, I absolutely love how coil guns work and I’m determined to build one Sooo please help me!!!
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
1. yes 2. Whatever has the most amp hours if they all have the same voltage output 3. yes. google voltage doubler. 4. yes. That's not very high of a voltage comparatively 5.Just use the power from the batteries.
Registered Member #3711
Joined: Thu Feb 24 2011, 12:09AM
Location:
Posts: 4
Thanks Turkey9! one more thing since the inverter draws alot of power do you think its even worth using in my gun, or should i just go with stepping the voltage up with a bunch of those little transformers found in flashcircuits or even a normal sized transformer then switch it to dc. What do you think would be best to do?
Registered Member #3603
Joined: Tue Jan 11 2011, 11:21PM
Location:
Posts: 11
If you decide to rectify the voltage from the inverter after stepping it up, be aware that rectifying effectively multiplies the voltage by the square root of 2 (~1.414). So if you rectify 330 volts AC you will probably blow up your capacitors, you probably want to rectify (330/1.414)=230vac and end up with around 330vdc. Also leave some breathing room with the ratings, such as charging them to 315v, etc.
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Coil gun build (ADvice)
