> Thanks for your time, > Mohit. Hi Mohit, does the signal come out of IC3B (it says COND1 on that label but AN1 has COND label) ? What are the values of C8, 13, 14, and is R4 10k or 10R ? Have you tried removing those capacitors ? I'm not clear as to why you'd want them on a square wave -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist