negative relay, lock, unlock

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KPierson

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Posted: September 06, 2008 at 1:17 PM / IP Logged

Looks like you might need a more flexible alarm system.

Kevin Pierson

dualsport

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Posted: October 08, 2008 at 10:02 PM / IP Logged

12vlost wrote:

Anyone please?

Could really do with a suggestion on wiring a relay that gives a negative output when a negative is removed,its too easy to pop a window the way its wired now and press the unlock switch on the dash.

TIA negative relay, lock, unlock - Page 2 -- posted image.

What kind of current are you looking for on the negative output?

If a half amp will do, all you probably need is a transistor like a BS170 or 2N2700. If you connect the gate pin to your switched line, then it'll connect your output to ground whenever the voltage rises above 4V. You just have to check the switched signal to see that it switches between ground and some positive voltage. It's voltage controlled, so it won't draw any power from your switched signal.

If you switched signal has voltage spikes on it, you'll want to add some protective circuitry to keep from damaging the transistor.

ckeeler

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Location: New Mexico, United States

Posted: October 09, 2008 at 5:51 PM / IP Logged

use a DEI 528T. it is a relay with an adjustable timer on it for the output which you can make positive or negative, which ever you choose. it can be activated with a negative pulse, OR (what your looking for), actvated when it sees a negative removed. cool huh?

12vlost

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Posted: October 13, 2008 at 4:14 PM / IP Logged

ckeeler wrote:

Very cool negative relay, lock, unlock - Page 2 -- posted image.

thanks for both suggestions,will try them and report back..............

12vlost

Member - Posts: 44

Joined: October 17, 2006

Location: United Kingdom

Posted: October 28, 2008 at 4:55 PM / IP Logged

I bought a DEI 528T and need a shematic to give me a - trigger when - is removed,any ideas please as the instructions are a little vague?

ckeeler

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Posted: October 28, 2008 at 5:02 PM / IP Logged

let me read this whole thread over again. i sorta forgot what unit you had.

ckeeler

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Joined: June 20, 2008

Location: New Mexico, United States

Posted: October 28, 2008 at 5:12 PM / IP Logged

12vlost wrote:

Hi, need a little help in a relay problem.

I have fitted two extra deadlocks to my Dodge Sprinter van which require negative feeds on each side of the MES relay to lock/unlock.

I have searched for the wire colors and have tested a few in the rear cabin but no joy.I have fitted a Cobra alarm which does give a negative feed when armed,this is great for the locking of the extra locks and its independant of the factory central locking so in my mind is more secure.Trouble is, I need a seperate negative feed when disarmed/unlocked to the extra dealocks.

I'm thinking, is it possible to wire a relay so I can feed it a negative signal and when the negative signal (from the alarm) is removed it gives a seperate negative feed to unlock?

TIA

connect the black wire to ground, red wire to constant 12v, connect the yellow wire to ground, the brown wire will be your output. connect the BLACK/ white wire to the wire that shows ground when armed on your Cobra. when it goes away after disarming it will activate the 528T. use the adjustment screw to adjust how long you want the output to be. just a secound or two or all the way up to 45 i believe. you have to cut the blue loop also

12vlost

Member - Posts: 44

Joined: October 17, 2006

Location: United Kingdom

Posted: October 29, 2008 at 12:19 PM / IP Logged

Many many thanks for taking the time to help out, will wire it up and report back,thankyou....

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negative relay, lock, unlock

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