In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

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<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">[url=http://forums.parallax.com/forums/profile.aspx?f=7&amp;m=304658&amp;p=653]william chan[/url],<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">[color=green>"If] -- Not by a spike, remember I said that this circuit is designed for ESD events.. if the unit is "off" but still plugged in to the mains, the capacitor could be in a discharged state.  In this situation the circuit would attempt to quench an incoming voltage spike.<o:p></o:p>

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<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">William, clearly there is a noise problem with your circuit design, and it should be diagnosed with a systematic approach.  Each sub-circuit should be looked at section by section to determine where the failure is or where it may be vulnerable.<SPAN style="COLOR: black"><o:p></o:p>

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<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana">We are here to help, but we also need to know what avenues you have tried so far and what the result was.<o:p></o:p>



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