Just a semi-related silly question. If I have a charged ceramic cap and increase the temperature to the extent that the capacitance reduces significantly, what happens to the voltage? >From conservation of charge, if the capacitance halves, the voltage will double. But from conservation of energy it will increase by only about 41% And why has no one mentioned supercaps? - I'm guessing temperature range but high temperature ones presumably exist. Although I'd probably look seriously at 105C or higher rated electros. RP On 29 December 2010 15:49, David VanHorn wrote: >> In the size range you're talking about, probably electrolytics _are_ the= way >> to go unless there are some very special other requirements. As well as >> the garden variety 85=B0C and 105=B0C caps, there are electrolytics rate= d for >> -55=B0C to 125=B0C and even -55=B0C to 150=B0C. You'll have to evaluate = the life at >> elevated temperatures to make sure it's good enough. > > > That may well be, but I figured I'd ask here, since if there IS > something like this available, you guys have probably seen it, or used > it. > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .