At 02:51 AM 6/23/02 +0200, Tal Bejerano - AMC wrote: >Hi 2 All > >Attach a quick schematic that I draw to explain my problem. >The problem is a hum I can't rid of. Check your ground and power routing. The center tap on the transformer should go directly to the mid-point of the 2 large electrolytic capacitors. Make that trace (or wire) between the 2 caps large and wide. Pick a single point on that trace and run all your other grounds to that point. The outputs from the bridge should also go directly to the large electrolytic caps, then from the caps to the regulators. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 18 years of Engineering Innovation (1984 - 2002) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics