does this relay exist?

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crj_lll

Member - Posts: 13

Joined: October 14, 2006

Location: United States

Posted: August 27, 2007 at 9:07 PM / IP Logged

I am not going to start anyhting until I fully understand the situation both in your circuit and in the car. I ask alot of questions because I have not done this, but I am not afraid of what I do not know.

*****

This is the part I am a fuzzy about. The other end of the diagram is connected to the inigition. Am I wrong for thinking this is a power source, similar to the inition power source on a radio?

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: August 27, 2007 at 11:04 PM / IP Logged

The "ign switch" input shown is just what you originally mentioned as the "alternating power" source; it would just go to 12V when you turn the ignition on, and go turn off to 0V when you shut down the car.

It's not being used for power, but just as the control for the circuit so it knows when to put out the momentary pulse.

If it's prone to glitches or your mirror trigger input is sensitive to short spikes you can clean up the signal with a Schmitt trigger, but we'll deal with it later only if necessary.

crj_lll

Member - Posts: 13

Joined: October 14, 2006

Location: United States

Posted: August 27, 2007 at 11:29 PM / IP Logged

Ok, I understand now.

IGN = The ignition power source

Relay NO = Delivering Pulse

Relay COM = Constant 12V power source

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does this relay exist?

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