Sergey Dryga wrote: > Vce(sat) - collector-emitter saturation voltage > should not be significantly higher for a darlington compared to regular > NPN transistor, Oh yes it is. Consider where the base voltage for the second transistor comes from. ****************************************************************** Embed Inc, Littleton Massachusetts, (978) 742-9014. #1 PIC consultant in 2004 program year. http://www.embedinc.com/products -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist