relay kick back diodes

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=106439
Printed Date: May 18, 2024 at 8:13 PM

Topic: relay kick back diodes

Posted By: trintcole
Subject: relay kick back diodes
Date Posted: July 29, 2008 at 8:09 PM

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?

Replies:

Posted By: i am an idiot
Date Posted: July 31, 2008 at 8:16 PM

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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