On 9/26/06, Bob Blick wrote: > > How do you calculate the value and rating of that capacitor given the > > maximum current draw? I can't seem to remember any of my capacitor > > formulae (or even if I knew one that would have helped in this > > situation). > > 1 Farad 1 Amp 1 second = 1 Volt. > > A decent rule of thumb for your current setup is 7 or 8 volts ripple peak-to- > peak with 1000 uF at 1 amp load. If you want less ripple, use more > capacitance. Ok...so what is the relationship between the formula and the rule of thumb? For instance, if I had a 5 amp load, do I need to increase capacitance to 5000 uF to keep 7-8V ripple? Thanks! Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist