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Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
im making a mini coilgun from 5 camera flash capacitors and i am going to use the charger circut from the camera and was just wondering if i could bank 2 of them up to reduce charging time
Registered Member #1083
Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
Do you mean in a series/parallel config? If so, yes, I think it would reduce charging time, but you won't have as much power because putting them in series halves the capacitance (but doubles the voltage). But if you have 2 sets of two in parallel and put those sets in series, you would have the same capacitance as just one capacitor, but twice the voltage. Unless the charger can go that high, you won't get as much energy. You get just as much energy if you have 4 in parallel, or 2 pairs of 2 in series and then paralleled. Of course, I'm no expert, so somebody please correct me if I'm wrong.
Registered Member #1208
Joined: Thu Jan 03 2008, 05:30PM
Location: Chesterland, OH
Posts: 154
100% correct about the caps, but i think he was talking about the camera inverters. yes, you could use 2 chargers to reduce charging time i would put them in parrallell, but make sure that you use separate inputs for each inverter. On the circuit for an old camera flash i bought at a flea market, i used a game boy battery charger rated 3v@ 100ma, measured at 5V @~750ma. still took ~1min to charge 4 caps. later i got greedy and used a lead acid battery charger rated 12v@ 1.2A. big mistake! measured 15V DC and, for some reason, 22VAC! so be careful. needless to say, i blew the inverter, and now have to wait for the diodes for my variac driven MOT to charge it a few times per second. I hope i helped!
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