I've never used a supercap before, though I have had one kicking about here for a long time, a 5v 1 Farad. I have an old code entry lock, which I am looking to install, which runs on 5v and needs a battery to maintain its code memory at 5uA.
I don't expect the mains supply to ever be off for long, but with no supply at all available to the lock, it reverts to a not very secure entry code of '0'.
Would the cap do the job? Anyone any experience of using them?