Discussion in "AVR Discussion Forum" started by    ankitbajaj01    Dec 28, 2015.
Mon Dec 28 2015, 02:48 pm
#1
Hello,

I am controlling 3 relays simultaneously thorugh AVR controller. While switching the relays ON/OFF, at output of 7805, ST make, I have observed the spike of voltage ranging 6V-15V. This spike goes to VCC of uC and makes the controller upset.

Please guide me how should I stop this spike from getting generated and if it is generated how to stop it further reaching to the controller.

Regards...
Mon Dec 28 2015, 11:17 pm
#2
You need to post your circuit diagram.
Thu Dec 31 2015, 11:54 am
#3
add 220uf 16v electrolytic capacitor before and after 7805 it will absorb the spike, the 7805 is an ic that a small spark will destabilized its stability


[ Edited Thu Dec 31 2015, 11:55 am ]
Thu Jan 21 2016, 09:46 am
#4
@ ankitbajaj01
use a diode like 1N4001-1N4007 in reverse bias with relay
this diode will absorb the reverse voltage generated by a relay
use 1000uf/16 volt electrolyte capacitor after LM7805 output
if problem still exist use a 10uh inductor after capacitor then
it will remove any spike going to controller
i do it may time and it works for me in a good manner

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