Marechiare wrote: > How will change the time to rise the signal on the capacitor from 0V > to 2.9V ? This is the wrong question, which is probably why you are disagreeing with everyone else. The right question is "How will the rise time from 0V to 80% (or any fixed percentage) of the final value change?". ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist