On Fri, Jun 10, 2011 at 2:01 AM, IVP wrote: > I've found with IR transmitters that a 470uF / 6V low-leakage > makes a big difference as the batteries run out. As Sergey says, > Vdd will droop and spike without a reservoir cap. You should > be able to work out what capacity is need to smooth Vdd. For > an IR transmitter the demand is fairly-well spaced bursts, giving > the cap time to recover somewhat. You might find that your > circuit draws too much current to be supplied like that from the > cap, but it would still be helpful for bulk smoothing and preventing > glitches > > What type of capacitor? Tantalum? Or another kind? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .