relay, keysense wire
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=123243
Printed Date: April 25, 2024 at 1:52 PM
Topic: relay, keysense wire
Posted By: rick28546
Subject: relay, keysense wire
Date Posted: August 24, 2010 at 9:51 PM
Here is my situation. I have a keysense wire that is normally negative and turns open when the key is inserted. I need to make this wire a negative when the key is inserted. I know there's a way to do this with a 10k resistor, but I dont remember how. If somebody could please post a diagram of this I would greatly appreciate it. Thanks
Replies:
Posted By: oldspark
Date Posted: August 24, 2010 at 10:24 PM
I presume you mean goes from +ve to negative when the key is inserted....
That can't be done with a resistor - it needs an inverter (whether an inverting relay or a transistor (etc) inverter.
Posted By: rick28546
Date Posted: August 25, 2010 at 5:55 AM
No. In a 2008 Lancer the keysense is normally (-) and when a key is inserted it goes to an open or neutral state. I need it to become negative when the key is inserted. Thanks again
Posted By: oldspark
Date Posted: August 25, 2010 at 6:49 AM
That's what I meant.
The answer remains the same.
Posted By: rick28546
Date Posted: August 25, 2010 at 12:00 PM
Found the answer. It turns it to a positive, but I can make it work. Its techtip 1921. Thanks!
Posted By: oldspark
Date Posted: August 25, 2010 at 6:23 PM
Is that an inverting relay?
Posted By: rick28546
Date Posted: August 25, 2010 at 7:21 PM
No relay, just need 2 diodes, a fused 12v source and a 10k resistor. If you search for techtip 1921 I'm sure a diagram will come up.
Posted By: oldspark
Date Posted: August 25, 2010 at 7:42 PM
Alas no, I find nothing in the search....
I'm curious how it was done given your description.... (since inversion is required)...
Can you post the link or fig?
Thanks in anticipation.
Posted By: rick28546
Date Posted: August 25, 2010 at 8:20 PM
If you send me your email I will email it to you. It is mostly used for door triggers, but will work for my situation as well
Posted By: dualsport
Date Posted: September 25, 2010 at 10:37 AM
rick28546 wrote:
Found the answer. It turns it to a positive, but I can make it work. It's techtip 1921. Thanks!
If it turns it to a positive, it's not inverting. Simple enough, but with the componennts described, it won't achieve the goal originally described, which was a negative output when the keysense is opened up.
Posted By: howie ll
Date Posted: September 26, 2010 at 3:56 AM
Using 1921 will take a wire that sits on ground normally, goes to open circuit, 1921 then converts that wire to open circuit normally and ground when activated so it doesn't invert it, I think you will need a latching relay or a source such as a remote start status output to achieve what you want.
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