- Joined May 25, 2019
Hi Sally it might have a short in between the paper and aluminum foil. now I need your help how long is foil used in capacitor 12 Volt 0.22uf any idea.Hi there,
I'm interested by capacitors and super capacitors and so i decided to make my own.
This is the textbook, school science project variety of capacitor, with A5 sheets of aluminium foil
separated by photocopy paper (as the dielectric).
This has been interesting. I've been able to get my capacitor to slowly release it's
charge over a period of 70 seconds (after the battery is disconnected)
before the display on my multi-meter registers zero volts.
Commercially manufactured capacitors can hold a charge practically indefinitely.
What i would like to know is:
Why does my homemade capacitor not hold a charge:
(It starts to discharge the very moment i disconnect the battery).
Both (aluminium) sheets are surrounded on both sides by paper.
It's not clear to me how, or why, my capacitor is discharging.
Thank you to anyone who can offer some suggestions or solutions
Mod edit: Moved from old thread.