I use NiCad & NiMh batteries frequently in Radio Control Model Airplanes. I 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 level of over charge. Since my batteries are seldom fully discharged, I limit the total charge to 120%. It works well for me. John Ferrell 6241 Phillippi Rd Julian NC 27283 Phone: (336)685-9606 johnferrell@earthlink.net Dixie Competition Products NSRCA 479 AMA 4190 W8CCW "My Competition is Not My Enemy" ----- Original Message ----- From: "Diego Sierra" To: Sent: Tuesday, September 23, 2003 12:08 AM Subject: [EE:] NiMH charger improvement > Hi! > > I design my own a NiMH reflex charger. It stopped charging the batts using > the -dV/dT technique. > > I am thinking in some improvements on it, so any advice would be welcome: > > -The psu is a 12V/2A regulated, so when it needs to charge few batteries a > lot of power is wasted. Could I use a switched psu with variable output > depending on the number of batts? , maybe controlled by the PIC. > > -Say I need to charge 4 different batts, I connect all of them in serie > with the charger. If I monitorize the -dV/dT of each one I can disconnect > each batt as they get charged, while still charging the others. In this way > the charging time will be reduced (roughly will be T instead of 4xT). > > Cheers, > Diego. > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu