It is rated at *exactly* 5V, so be careful not to exceed its working voltage. Regards, Isaac Em 5/2/2010 19:10, Marc Nicholas escreveu: > Did you take a gander at this? > > http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=3D283-30= 15-ND > > -marc > > On Fri, Feb 5, 2010 at 3:37 PM, William "Chops" Westfield wrote: > > = >> On Feb 5, 2010, at 10:48 AM, Isaac Marino Bavaresco wrote: >> >> = >>> Very expensive though (over $25 only the cap). >>> = >> Um. You're looking at different caps than I would. >> >> You need to know how much current your device will need, and what the >> minimum voltage it can use. Isaac's capacitor is particularly >> expensive because he wanted a starting voltage of 6.5V and a current >> capability of 150mA, which moves it out of the realm of most >> "supercaps." (You can get a .47F supercap with high current >> capability for about $4, but it's only 5.5V. Or you can get a .1F >> 6.3V double layer cap for about $6, but it's not spec'ed for high >> current. (hmm. 30mohm. MIGHT work...) Or 3x 1.5F 2.5V caps (0.5F @ >> 7.5V in series) for about $3 each.) >> >> The "usual" setup seems to be to just connect the cap across the >> supply rails of of memory/microprocessor chips that are designed to >> have some level of operation down to voltages significantly lower than >> their normal supply voltage... Adding more capacitors for higher >> voltage seems to be about the same price as adding a boost converter >> style UPS circuit... >> >> BillW >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> >> = __________________________________________________ Fa=E7a liga=E7=F5es para outros computadores com o novo Yahoo! Messenger = http://br.beta.messenger.yahoo.com/ = -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist