Hi shahidali55,
On the perfboard I would probably run a buss wire lengthwise under the pic and from each pin I would add .o1uf or even .001 uf capacitors to the buss wire which is hooked up to ground, I think you are getting RF into the chip from the outputs, RF is funny, it sort of crawls on the outside of conductors and does funny things. AS for things like cellphone chargers emitting RF I guess it depends upon which country's emission standards they meet or fail to meet. You might try using 2 bypass caps, 1 from each leg of the Mains power to ground right at the outlet. Ferrite beads are useful to trap RFI on wires on the circuit board. Be sure they are made for that high of a voltage,otherwise they pop like firecrackers
Some links on RFI:
http://www.edn.com/archives/1995/010595/01df1.htm
http://www.eham.net/articles/12139
Last edited by Archangel; - 29th January 2008 at 08:02.
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