On 08/03/2011 15:56, V G wrote: > On Tue, Mar 8, 2011 at 10:46 AM, Herbert Graf wrote: > >> Generally the ceiling above the board will have a dent. >> >> I've seen a cap actually embed itself in the suspended ceiling above a >> workbench, it's actually quite likely to injure if you happen to have >> your head over the board when the cap blows. >> >> > How much energy do I have to put in for it to do that? Approx how many > volts? Basically any electrolytic at full woking volts. Encapsulated Bead Tantalums smoke, glow bright red and eject pellet. =20 (there was a batch marked back to front). 110V AC on a 150DC 400uF is ample or 230V AC on 275V DC 400uF in older days they did not have indented lines on top for can to split, In 1970s a BY127 or whatever rectifier failing short on Direct Mains=20 Chassis TV was spectacular. The TV (probably mostly valved) operated but=20 with Horrible Hum bar on picture and massive buzz on Sound. I ducked and=20 bits of aluminium capacitor case embedded in breeze-block wall. Usually a large can with a common and 3 values in the same can with four=20 tags. Metal clip to chassis. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .