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Noise Noise Noise


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Hello All,
I am new to the forum and electronics in general.  I have designed some circuits to monitor a 3 phase 230volt electric motor.  I am having a problem with the electrical noise spikes generated by the contactor in the motor causing my circuits to act up.  I am at a loss for filtering this noise.  I have tried a line filter on my power supply and have caps all over the place on the circuit boards.  This has helped but has not taken care of all of the noise.  Any  other suggestions. 
Thanks,
John

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