does this relay exist?

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crj_lll

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Joined: October 14, 2006

Location: United States

Posted: August 23, 2007 at 3:25 PM / IP Logged

crj_lll

Member - Posts: 13

Joined: October 14, 2006

Location: United States

Posted: August 23, 2007 at 3:38 PM / IP Logged

I guess the moderator changed my title.

No problem

But I must also add that I want to know if it is possible even if the relay does not exist?

dualsport

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Joined: September 27, 2005

Location: United States

Posted: August 23, 2007 at 8:37 PM / IP Logged

Pretty much anything's possible, but I'm not sure what that relay's supposed to do.

What current is changing from power on to power off? Are you trying to detect a change in current or voltage?

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: August 23, 2007 at 9:22 PM / IP Logged

Sure, there are current-sensing relays but I second the above question: what is it you are trying to accomplish?

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crj_lll

Member - Posts: 13

Joined: October 14, 2006

Location: United States

Posted: August 23, 2007 at 11:08 PM / IP Logged

The constant power would be power from the battery of a car. Always on.
The alternating power would be the inition power from the car.
The 12 Volt pulse would be to activate an accessory.

What I would want is for the accessory to activate each time the car is turn off ot turned on or each time the power state changed.

dualsport

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Location: United States

Posted: August 23, 2007 at 11:53 PM / IP Logged

Alternating is usually used when referring to alternating current, or AC (as opposed to direct current, DC), that was what seemed confusing. I think you're referring to the toggling of the ignition switch on or off.

From what I can make out of the description, I guess you just want a pulse output when your ignition is either turned on or off. Easy enough, but not sure what you mean by "each time the power state changed".

Power state of what?

crj_lll

Member - Posts: 13

Joined: October 14, 2006

Location: United States

Posted: August 24, 2007 at 12:08 AM / IP Logged

You have it dead on. I used the term CHANGE OF STATE because I have found it in some of my research online. I assume I am using it incorrectly.

I am a NOVICE and I KNOW IT.

LOL

dualsport

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Joined: September 27, 2005

Location: United States

Posted: August 24, 2007 at 1:53 AM / IP Logged

This is a way you can do it using a 20 cent part-

crj_lll

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Joined: October 14, 2006

Location: United States

Posted: August 24, 2007 at 2:51 AM / IP Logged

Thank you very much. I have to translate the symbols and markings, but this is a great start. Thanks

crj_lll

Member - Posts: 13

Joined: October 14, 2006

Location: United States

Posted: August 26, 2007 at 2:07 AM / IP Logged

dualsport wrote:

This is a way you can do it using a 20 cent part-

Thanks for the diagram. Now I need some help identifying whatis what. Below I have listed what I do not know, which is mostly everything.

Mouser Part #: 511-4070

Manufacturer Part #: HCF4070BEY

Description: 5V Logic (HCF4xxx, M74HC/HCT, 74AC/ACT, 74VHC/VHCT) Quad Exclusive OR

R1: 100K Resister

C1 4.7uF: ?????

Q1 BS170: ????

D1N4001: ????

Relay COM: ????

Relay NO: ????

Any help would be greatly appreciated.

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