I'd go with ripple current, especially since it worked before just fine, but adding more stages that might be switching in sync, will increase the ripple current quite abit. Thats why when doing mulitple slaves, if you can run on different frequencies, you can reduce the input ripple. Might need to look at increaseing the number of caps on the front end as well. __________________________________ Do you Yahoo!? The all-new My Yahoo! - What will yours do? http://my.yahoo.com _______________________________________________ http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist