siren chirp when turning off ignition

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KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: May 03, 2008 at 5:06 PM / IP Logged

No adding resistance won't help - the relay is already adding resistance to the output - if you add too much resistance you will limit the current/voltage to the point the relay will never energize. Adding a small amount of resistance won't do anything.

The stripe of the diode should face the siren output of the alarm.

The non striped side should face ground.

Kevin Pierson

i am an idiot

Platinum - Posts: 13,716

Joined: September 21, 2006

Location: Louisiana, United States

Posted: May 03, 2008 at 6:20 PM / IP Logged

dtk1 wrote:

try unplugging the relay and see if the siren chirp connecting it directly to the output of the brain. and see id it chirp

Have you tried this yet? I am willing to bet that the alarm is sending out a chirp to the siren when the ignition is turned off. If it is you can fix this problem with a simple delayed relay diagram from this site.

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: May 03, 2008 at 6:44 PM / IP Logged

i am an idiot wrote:

dtk1 wrote:

try unplugging the relay and see if the siren chirp connecting it directly to the output of the brain. and see id it chirp

If thats the case wouldn't it have chirped before he added the relay? The first post makes it sound like everything was working fine until he added the relay, now it chirps.

Kevin Pierson

i am an idiot

Platinum - Posts: 13,716

Joined: September 21, 2006

Location: Louisiana, United States

Posted: May 03, 2008 at 7:49 PM / IP Logged

I am still trying to figure out what the diode is going to fix. Something is telling the relay to energize briefly, the lack of a diode is not making it energize. The diode will only kill the spike created when the electrical field collapses when power is removed from the coil.

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: May 03, 2008 at 8:51 PM / IP Logged

The diode probaly won't "fix" anything, but if he wants the siren output to last a long time it would be a good idea to add one. The collapse of the coil has the potential to destory the transistorized siren output considering the siren output wasn't intended to drive inductive loads.

Kevin Pierson

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siren chirp when turning off ignition

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