just be very careful with the grounding, it is very hard to get good scope traces in a switching power supply, especially with multiple switchers running because there is a lot of noise. most of the switcher data sheets/app notes i've read go to great lengths to explain this and show what is necessary to get a meaningful scope trace in a single switcher, with 3 switchers running it's worse. did you design the circuit board? i know layout is somewhat critical with switchers. PicDude wrote: ------ > I'll get a scope on it the next time to see if anything unexpected is > happening. -------- --=20 =93Cowardice asks the question: is it safe? Expediency asks the question: is it politic? Vanity asks the question: is it popular? But conscience asks the question: is it right? And there comes a time when one must take a position that is neither safe, nor politic, nor popular- but one must take it simply because it is right.=94 : Martin Luther King Jr. 1929-1968 _______________________________________________ http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist