Author Options:

how can i charge this? (capacitor) Answered

i have a camera capacitor i need to charge. (not for a tazer). it 330wv, 120uf. how can i charge this. with a aa battery and a resistor? any ideas?



yeah, so for normal capacitors you can hook it up directly to the battery, you don't even need an LED because if you don't use resistors, it usually charges in under a second. The only reason why you wouldn't get good results for a flash cap using a simple battery is because the capacitor's voltage can only reach it's voltage source. If you have a 10volt capacitor and hook it up to a 1.5 volt battery, it's only going to charge up to 1.5 volts. BTW don't use the I'm only 13 excuse to need help. A young age shouldn't be even compared to knowledge. Stuff like IQ test test how much you know, and it doesn't depend on your age, it's how much you know. BTW I'm 13 too! lol

|:-) Yeah, by 13 I was already blowing fuses in my home LOL

I did a while ago when testing transormers and I was sooo scared cause I actually though I burnt the wire behind the wallls because all of the breaker wswitches looked normal, but it turns out you have to flip it back and forth.

At least you CAN reset breakers. When I was 13, there were no breakers to reset. One either had a switch to pull to kill power the that portion of the house, and then remove and replace the fuse, or one pulled a "main block" from the box (like where I lived|), and replaced the fuse then replaced the block. Fuses could get expensive after awhile LOL

you could do that, but it would be easier to use lower voltages and more uF. It would actually be more dangorous tho, but it would be easier. Just remember, 4 caps using one charge probably take around 6 seconds to charge.

Ok this is going to be a long post! I havn't really had any classes either, but books that I recomend to get you started if you really want to get into electronics are: Teach yourself electricity and electronics practical electronics for inventors robot builders bonanza Those 3 books can teach you pretty much everything. Also if you do read them DO NOT SKIM. I tried skimming (who wants to read boring text?) and I got no where. If you get the 1st book I mentioned there's little quizzes after each chapter, take them (don't cheat! You'll regret it later) to test how much you learned. As to your multiple capacitor charging question if you hook all of the in parallel (all of the positives together and all of the negatives together) then it'll charge them all, but it'll take 4 times longer. Connecting capacitors in parralel you add all of there capatance. If you put capacitors in series you do a kind of complicated equation (want even mention it to confuse you) and basically the voltage rating goes up and the capacitence goes down. But if all of the capacitors are the same and you hook them all up in series just multiply the voltage rating by the number of capacitors you have and divide the capactince by the numbers of capacitors you have. charging a capacitor at 132,000 uF at 25 volts created some pretty huge sparks that I could spot weld with. But also 3,000uF at 9 volts can create a very tiny weak weld (I just charge a capacitor, put it to a bar of metal, it shorts and sticks, but takes no effort to take off.) You might be able to weld with it.

Ok in addition to what I just posted (below this) the instructable on this subject says to "let the LED" that is wired to the cap stay attached, and it will serve as an indicator. One can listen also to the cap itself (if their hearing is still intact) as it gives off a high frequency whine while gaining potential. The pitch goes way and levels off at peak.

it's harder to explain without a background in it to lean on......batteries get "charged" to be technical, but capacitors hold a "potential".

Hmm, I will try:

The rate of charging is typically described in terms of a time constant RC (resistance times capacitance).

so, I plug in 1000 ohms for the resistance (random figure to illustrate), 12 volts, at 120 uF and you get a time constant of 12 seconds. It will reach a max value of 1439.9999999999998 uF needing only 0.012 Amps of power.

You would use the figures for your circuit of course.

sorry, the max value is 1439.99999999 uC at 0.012 amps