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relay kick back diodes


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trintcole 
Member - Posts: 1
Member spacespace
Joined: June 03, 2008
Location: Florida, United States
Posted: July 29, 2008 at 8:09 PM / IP Logged  
I have a viper 5900. I have installed two relays driven off of 2 of the -200ma pulses. They work fine. Do I need to put a diode across the coil to prevent kick back voltage? Or does the viper have a protection built in for this?
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: July 31, 2008 at 8:16 PM / IP Logged  
If the alarm has an output that is capable of only 200MA I am sure that they know you are going to use it to drive a relay.  If they do not tell you in the instructions to put a diode across the relay, I am sure they have one on the board to protect the transistor.

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