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How do i make a capacitor charger circuit? Answered

I am talking about one for in a coilgun. i had a old (very old, 1.3mp) samsung digimax 101 digital camera, I decided that since i have moved on it was time to take it apart for the rich insides.

I knew what to look for, so i found it; the transformer for the capacitor charging circuit and the big cap for it. I unsoldered the transformer piece, cut the wires from the cap (it was not mounted on the board), and unsoldered the flash which had not 2 but 3 wires coming from it. one was yellow, one was green, and one was black and was attached to the deflector behind the flash. the black wire was connected to a small black piece that looked a lot like the charger transformer but only had two active pins instead of four. im not sure what it is for, i think it is a self resetting fuse, incase the camera short cicuits, but im not sure. any insight on that would also be helpful.

Back onto the subject, i would like to know what i need (other than the yellow transformer piece) to make the charger circuit. I have heard there was a transistor, would it be NPN or PNP?
there was also a diode, i am guessing one of the black ones, but is there anything else? i have those three things if that is all i need, but how do i solder it all together?

thanks in advance,
z247

PS: the yellow transformer has only 4 pins that actually do anything, one is between two on one side and is only for support. either that or i accidentaly broke it.

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Jack A LopezBest Answer (author)2010-12-19

I think you will find the circuits on this page
http://www.talkingelectronics.com/projects/XenonFlasher/XenonFlasher.html
to be helpful.

I was going to say something about the foolishness of taking apart a perfectly good, working, circuit, you know... without taking, notes, pictures, making a diagram to show how to put it back together again... but I then decided that would be unkind. 

The link above will hopefully give you some clues as to how to put your charger circuit back together again, or how to build a new one.

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zack247 (author)Jack A Lopez2010-12-19

ok, i just want to point out, like i told lemonie, the charger circuit was part of a larger board connected to a even larger board, it wasn't exactly an option to stuff the whole camera into the gun.

I will check out the links you both posted though.

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lemonie (author)2010-12-19


You had a charging circuit hooked-up to a cap', but you took it apart and now you want to know how to put it back together?

I'd look at coil gun instructables first.
https://www.instructables.com/tag/?sort=none&limit%3Atype%3Aid=on&q=coil+gun

L

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zack247 (author)lemonie2010-12-19

no, it was part of the rest of the camera, and the 2 circuit boards had to be connected together in order for it to start the charge cicuit, and the boards were not exactly small, so i decided that it shouldn't be too hard to put it back together on a separate board.

so in short, it was on a big set of circuit boards that had to be hooked together to work.
i wanted it to be more smaller form-factor, so it would fit in the shell for my gun that i plan to use.

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lemonie (author)zack2472010-12-19


Yes, I know them. How to reconnect the bits is on the PCB - trace the copper-tracks and you'll know what goes where.

L

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zack247 (author)lemonie2010-12-19

the only problem is that there are several little spots where the trace crosses over to the opposite side of the board, and some traces split two ways, and a couple go to a IC.

this is quite confusing!

i looked at the Coilgun handgun instructable, the one tha won a competition, and in one of the steps a circuit diagram is shown, using the circuit board at least.
im not sure what type of transistor is in that part though, i don't quite understand the circuit from the way that it is.

i might have to go to the local thrift store and find some film cameras, that way i can figure this out. luckily, they sell them a dime a dozen, there are millions there, but i cnt get there on a sunday.
if i could just find a schematic of just that part of the circuit, i could make this.

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zack247 (author)lemonie2010-12-27

well i went to the thrift store and picked up two film cameras at $2 each, how to use the first ones charger is a mystery, but the second one has 2 pins that activate the charging process, i finally found them after i shocked myself on the cap lol.

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