Mar 19, 2011 #1 qayyoum Member level 5 Joined Apr 7, 2006 Messages 80 Helped 20 Reputation 40 Reaction score 20 Trophy points 1,288 Location PakistaN Activity points 1,675 8051 Based Relay Circuit hi any one help me about the ...how to Protect relay spike i am make a some circuit on 89c51 based control relay with uln 2803 but just i am connect transformor and switch relay my controler going to restart please any one hep me thanks Last edited: Mar 21, 2011
8051 Based Relay Circuit hi any one help me about the ...how to Protect relay spike i am make a some circuit on 89c51 based control relay with uln 2803 but just i am connect transformor and switch relay my controler going to restart please any one hep me thanks
Mar 20, 2011 #2 S srizbf Advanced Member level 5 Joined Apr 3, 2010 Messages 1,992 Helped 417 Reputation 840 Reaction score 329 Trophy points 1,363 Activity points 10,985 your problem of controller going mad is due to the spikes in supply. remove the microcontrollers supply from the relay supply. Have a separate supply for controller and test it separately. if works ok , then you can add some filters , should it be from the same supply.
your problem of controller going mad is due to the spikes in supply. remove the microcontrollers supply from the relay supply. Have a separate supply for controller and test it separately. if works ok , then you can add some filters , should it be from the same supply.
Mar 20, 2011 #3 nandhu015 Advanced Member level 5 Joined Feb 11, 2006 Messages 1,960 Helped 300 Reputation 600 Reaction score 222 Trophy points 1,353 Location India Activity points 9,924 Opto isolate micro and relay circuit