Electronics > Electronics

Capacitors

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gamefreak:
Can someone explain them to me? I know that some are polar and wont work unless placed a certain way, but what i cant figure out is how to discharge them when they are full. I know they work based on the current and that current has something to do with the "force" that the electricity has. But can someone shed some light on my understanding?

So far all i have been able to do with a capacitor is make an LED slowly fade with a 470 uF, 16V capacitor, but it stays faded and the capictor keeps the charge.

ed1380:
The best way I've found to discharge them is to let some touch the contacts, I don't know how good this will work on smaller ones, but works real well on the big ones. ;D

gamefreak:
yes but i mean... It wont fade the LED it will keep it on and when i turn off the power the LED will stay on for a little bit before fading off

555 timer chip guy:
A capacitor works gust like a rechargeable battery, you fill them up and then discharge then. Polarized capacitors you can only put in one way positive to positive and negative to negative, and be careful if the current reverses or you put it in backwards the capacitor could explode it has happened to me quite a few times. Unpolarized can go in either way. Are you sher that the voltage is not coming from the rest of the circuit, after the LED fades out and the battery is disconnected test the capacitor for voltage because remember the capacitor fills right up again if the power is still on.l

Admin:
470 uF is a fairly large capacitor and can store quite a lot. what is the resistor value that you have with the LED? just lower that resistor value and the capacitor should discharge faster.

(i use an LED on my high power circuits to safely discharge my capacitors)

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