question: can you use a 12v wall wart plugged into an outlet at home to charge a 12v audio capacitor? cant seem to find any useful info on this?
It is not to prevent damage to the capacitor. It is to avoid starting a fire. An uncharged capacitor appears as a dead short.just a little experimenting. drill with 6 inch disk on the end with magnets spinning close to another disk of coils, like for diy wind generator. the coils are rectified for dc, and can easily enough generate 12vdc. I have this car audio capacitor, 12v 1F. wondering if the little setup would charge it? in car environments, they charge them up first before install using the car's battery along with a test light or resistor. I assume this is to reduce the flow of amps as to not damage the cap. If it was very slow charge, wondered about the wall wart plug.
As @MrChips says, an uncharged cap starts out looking like a dead short. So long as you can supply any current at all at a voltage higher than the current voltage of the capacitor it will charge until it reaches its rated voltage. But charging it to overvoltage can damage it.just a little experimenting. drill with 6 inch disk on the end with magnets spinning close to another disk of coils, like for diy wind generator. the coils are rectified for dc, and can easily enough generate 12vdc. I have this car audio capacitor, 12v 1F. wondering if the little setup would charge it? in car environments, they charge them up first before install using the car's battery along with a test light or resistor. I assume this is to reduce the flow of amps as to not damage the cap. If it was very slow charge, wondered about the wall wart plug.
Resistance.So, turns out, aside of charging a cap with this setup, "anything" so far I attach as a load drops the volts way down. So, open circuit with NO load, meter reads about 25vdc. (The volts from the coils is rectified.) LED, resistor, ic reg, whatever is attached, bring the volts down to 5ish volts. What am I looking at here? This is just a fun little experiment. I'm not opposed to using boosters, transformers or whatever. Let's have your input. Thanks guys.