Fireworks are banned here....I'm ordering these now
Tantalum haters aside (LOL). Did you check that 12 volt power supply with a volt meter. Lots of them are rated at 12 Volts, but can/will put out a good bit more voltage. If in question, I would at least double the voltage rating for the cap.
I ran for a good 5 minutes prior to fireworks. Can a backwards cap survive that long before igniting?
Everyone says no Tantalum on power supplies
Quote from: JoeN on Aug 15, 2013, 02:24 amI ran for a good 5 minutes prior to fireworks. Can a backwards cap survive that long before igniting? Yes. When reverse biased, a value-metal cap actually breaks the oxide down. Until the oxide is thin enough to cause a short, it won't break down.Quote from: JoeN on Aug 15, 2013, 02:24 amEveryone says no Tantalum on power suppliesThere is a big difference between Tantalum-MnO2 and Tantalum-Polymer. Polymers are actually preferred for power supplies... Switching power supplies...A 7805 isn't sensitive to ESR since it is a linear supply. In fact, 10uF is well beyond what most manufactures recommend anyway. You could easily get away with ceramics or aluminum Electrolytics, and they'll be cheaper.
Will .1uF be enough for both sides of the 7805?
P.S.I just remembered... I've had a couple of regular electrolytics fail on a home project. They were probably over-voltaged... Maybe 1000uF/16V on a "nominally" 15V circuit. One was on the positive power supply and one on the negative... Since they both failed at the same time, obviously age had was also a factor. The thing hadn't been powered-on for a few years, and when I turned it on I didn't see what happened because they were inside the enclosure. It made an "expensive noise" (as my dad used to say smiley-grin ) and some really nasty smoke came out... I had to go outside 'till the smoke dissipated. (It wasn't actually an expensive failure.... I replaced the caps and it was good as new.)
I've actually seen a picture in an electronics book of what happens when you insert a relatively large cap in backwards. Basically, it was on a breadboard, and the cap was gone, and part of the board was melted. If you want a project to look "hardcore" or something on a breadboard... Blow up a cap and get scorch marks on your breadboard!(My company, its affiliates, me, or my dog are not responsible for any damage done from exploding capacitors on your breadboard. Use at your own risk. Actually, just don't blow up caps.)