Instructables
Picture of Capacitor Charger/Coilgun V2.0
Ok. I know that there is already an instructable on how to build a capacitor bank charger, but for those of you who are either looking for more inspiration, or just want to see a different way to make it, check here. This version made is more of a ~much~ more deluxe version. Why did I make this? Well, I was going to use it for a coilgun, until I realized that the idea of being able to shoot something at at least 300fps is not plausible, unless you have a more powerful circuit (and therefore more powerful cap. bank). I am a bit new to this electronics stuff, so if any of you out there have some know-how to contradict this, and if it really IS plausible, please, prove me wrong! Please note, though, that this device has a very high output voltage, and it (might?) kill the weak of heart if an arc occurs across their heart (not to mention, it HURTS), so be careful when handling any capacitors and/or the circuit connected to them. Lastly, Please excuse me for any errors there may be in this instructable; it is my first. Enjoy!

6-21-07 UPDATE: Added an SCR into the circuit (new button; the old one short-circuited). Details on the SCR on step 3.
 
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lilpesh3 years ago
parallel=voltage series=capacitance
Hmm ? I thought parallel -> capacitance and series -> voltage
Am i wrong ?
I agree with you,
2 cap series = 1 cap 1x Voltage 2x capacitance

2 cap parallel = 1 cap 2x voltage 1/2x capacitance
It's the exact opposite of what you're saying :)
junits155 years ago
here u can buy camera flashes! real cheap! :D
Or instead of buying them you could just go to any where that has photo development:Walmart, Target, etc. I managed to get 24 used cameras in one visit today over half of them Kodak just say that you need them for a science project and NEVER something that even the strictest person would even think about calling dangerous. :D
In the country where i live i can't even find unused cameras costing less than 10 Euros ... Any tips about any good site
to get them for really cheap or even free ? In addition Capacitors are far too expensive than the prices people say... :(
Any advises are welcome
i say science project too
mkaduk1 year ago
You can remove third wire.

The third wire is as n3ldan wrote to ionize xenon bulb so the electrons can pass (to ignite flash). Actually smaller capacitor and coil is there only for that purpose, and can also be removed, also led or neon bulb indicates when cap is charged, that can as well be removed.

There is a nice youtube moving explaining how the circuit works http://www.youtube.com/watch?v=8YuDlhMMIaw

It's very simple, there is a nice transformer with transistor which makes an oscillator, diode to rectify from AC to DC and that goes to large cap charging it.

Warning: If you ask such a question, or having doubts, you probably don't understand what it safe, and you shouldn't be playing with high voltage (HV) circuits. High voltage can kill you.
Tobor 2.01 year ago
it's okay, aren't we all 15?
how much did your caps cost cause i got one for £26 rated at 400V@3900uf and i was wondering if this was a bit expensive?
i have one rated for 68000 uF @ 16V
liddleLOL2 years ago
I need help:

I am making a charging circuit for a coilgun, but i accidentally bought non polar caps. I was wondering if i could still use these with some sort of circuit adjustment, or if i need to purchase all new polarized caps? Can you help?
moza7 years ago
what are the red and black things stinging out of the box (there are 2 pairs of each)
binding posts (no offense, but that was sort of a stupid question.) :/
The only stupid question is the one that isn't asked
Very true.
I disagree. Some questions are honestly just stupid, like asking a postman what he is doing while putting mail in mailboxes, or other such questions. The only questions worth asking are the ones that will benefit the inquirer, audience, venue, or person asked.
i disagree, not all people know what a mailman is. ex(if someone comes from a smaLL TOWN and there is no mail, they would not know what a mail man was
Um... what? Mail comes to literally every city in the U.S., and pretty much anywhere anyone with access to a computer has access to a mailman, so...
yes because fedex will drive 50 miles into the corado mountains to deliver mail. good try but fail
or it may be a small town where people still drive to the post office to get there mail PO boxes guys get with it
There are no stupid questions, but thinking everyplace in the country gets mail directly delivered is a stupid assumption.

Also, maybe the poster just hasn't worked with electronics and thought the binding post might be some functional part they've never seen, have some understanding for people who's pool of knowledge is different than yours. And asking questions about things you don't know is smart.
they are plugs for external power connections, there instead of alligator clips
Raydoom3 years ago
do i need to have the circuit board from the camera to charge the compasiters , i have many large compassiters but no board , can i just hook the compasiters to a battery and it will charge ?
or do i need the circiut board from the camera to get the power from the battery into the compasiters at a higher volatge or somthing
OXI2vasyl4 years ago
red spaghetti? lol
skuitarman5 years ago
are the capacitors in series or parallel
it easy... parallel = POWER but spent batteries FAST series = LESS POWER but spent battery SLOW it also has explanations more informative, but this is just an example ^^
Parallel. If you try to wire them in series they will do nothing. I can't quite explain how they work, but wikipedia sure can :) Even if you don't really care how they work, for safety's sake, and future experiments, it's probably a good idea to read about them anyway.
Actually, wiring capacitors in series increases their voltage rating, but halves total capacitance.
It will not necessarily half the capacitance 1/Ct = 1/C_1+ 1/C_2+1/C_3 ....
I'll have to read up on that, I was under the impression that you could not directly wire them in series, but I think I've got a great use for higher voltage. Thanks for the correction.
JTreehorn4 years ago
Just completed a slightly modified version of this project and thought I would post a very important issue.... .....On my cameras chip (all 4 of them), the positive and negative are in reverse from your drawing. Found this out the hard way. I blame myself for not taking note of the batteries position before removal. So again, on the cameras that I have (Kodak HD Power Flash) the negative is by the flash which would be the bottom right on your drawing. Thanks for taking the time to post this instructable and aside from the issue with the drawing (which could be a design change by Kodak) it was very helpful.
i am noticing some contradiction between diffirent coil gun ibles. some say to use a charger bank, while others just use one charger and it seems to work fine. wat are the advantages and disadvantages to useing a bank as opposed to a single charger?

The little flash circuits are not really designed for high current charging. And they make really crappy coil gun units. If you're looking for something powerful that will charge the capacitor bank radiply, check out this intructable. http://www.instructables.com/id/DC-DC-HV-Boost-Converter/ I used this one for a small (but powerful) coilgun project. You don't really have to stick to the parts list but if you're a novice, go ahead and stick to it.

it charges faster with a bank
philgenius6 years ago
i still do not get how u wire the capacitors. do you wire them (-+) (-+) with a wire making a U on top of those, turning around at the bottom or (+-) (-+) et cetera with the wire.
In this project, they are wired in parallel. All the + are wired together, as well as -. If you are wanting to double the working voltage, you could wire pairs of 2 in series (I'm assuming these are 330V caps) and you will end up with a voltage rating of 660V (a recipe for instant death) and half the capacitance. So if they are 180uF, 2 of them wired in series would result in 660V @ 90uF. So If you had 8 and wired four of them in series, and then wired the pairs in parallel, you would have a bank of  660V @ 360uF. Pretty dangerous. I don't recommend anyone with a lack of experience in HV attempt to build anything on this page. I've seen capacitor banks so powerful, that they have actually blown off fingers! This one, while it may not blow of any body parts, can still stop your heart if you get bitten by it in the right location and at the right timing.
RPisces (author)  philgenius6 years ago
You wire them all in parallel. That is + to + and - to -. Imagine it as railroad tracks. You take a capacitor, and line it up with the + leads and all the - leads of the ones behind and in front of it, and then place them on the tracks. At the end of the tracks, you do not make a 'U' or anything (that would short it out, anyways). Visualize it like this: + + + + + + + + + + + + - - - - - - - - - - - -
btw, is it okay to wire capacitors with the same voltage but different uF together?
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