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11/10/02 12:37
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 		 #32234 - RE: Electrical noise problem
mehmet karakaya wrote:
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if the relay on the board is driving a contactor and the contactor is switching on and off there will be electrical arc between relay contacts .this causes electrical spikes in the power supply of microprocessor .


..not if the layout and powersupply are designed righ !. There is rarely a need for full groundplane PCB design just to avoid some little spikes. Always fit healthy reservoir capacitors to the PCB near the low voltage inlet, by pass that with a 100nF cap, and put 100nF ceramics directly across the processor. The Supression with an RC filter across the relay contacts though is always good practice. Don't forget the flywheel diode !

Steve

Steve

List of 14 messages in thread
TopicAuthorDate
Electrical noise problem            01/01/70 00:00      
RE: Electrical noise problem            01/01/70 00:00      
RE: Electrical noise problem            01/01/70 00:00      
RE: Electrical noise problem            01/01/70 00:00      
RE: Electrical noise problem            01/01/70 00:00      
RE: Electrical noise problem            01/01/70 00:00      
RE: Electrical noise problem            01/01/70 00:00      
RE: Electrical noise problem, Per            01/01/70 00:00      
RE: Electrical noise problem Per            01/01/70 00:00      
RE: Electrical noise problem Erik            01/01/70 00:00      
RE: Electrical noise problem, Erik & Rob            01/01/70 00:00      
RE: Electrical noise problem Per            01/01/70 00:00      
RE: Electrical noise problem Per            01/01/70 00:00      
RE: Electrical noise problem Per            01/01/70 00:00      

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