relay kick back diodes

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trintcole

Member - Posts: 1

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?

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i am an idiot

Platinum - Posts: 13,670

This member consistently provides reliable information

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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relay kick back diodes

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