On Tue, 23 Sep 2003 08:21:31 -0700, John Ferrell wrote: > find that often the charger s unable to detect the peak, especially with > NiMh. It is desirable to have a step down to trickle after a certain John, thanks for the advice, but I managed to make my charger works :-) What I want is to use a switching power suply for powering the charger, but with a voltage output controlled with the PIC depending on the number of batteries to charge, i.e., for just 1 battery a 3v output is enough, but for 4 batteries I would need 9v, I do not want to have a fixed 12v output, because when the 1 battery charge, I waste 9v. The other thing is to charge different batteries in serie, disconnecting them while they get charged. Cheers, Diego. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu