I am building a simple charger for NiMH batteries. It will have a fixed rate constant current source and I intend to vary the charge rate between different cells and standard/trickle rates by pulsing the charger.. A web search suggests that this is a well accepted technique but the one piece of information I am struggling to find is the pulse rate. My gut feeling is that something between 1Hz an 100mHz would be about right. can anyone confirm this? __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb *Sent from my etch-a-sketch* --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .