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Relay to 3-phase contactor: Spark and Noise

2006-10-15 by behrooz_hariri

The final contactor wich start/stop 3-phase motor and is connected to
a 5 volts relay on my AVR circuit board, cause spark and this has
negative effect on both AVR and specially LCD.

Is there a circuit to diminish these electrical shocks? 

Thanks
Behrooz Hariri

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