Don't know what to call this circuit

Kadett200is said:

Hi every1

I'm looking for a circuit that will activate a relay of 12v DC only if 12v is supplied for longer then let's say 5seconds. This is for a stand alone IR alarm unit. I want to take the output of the speaker when it's alarming and put it through an op amp so that I can activate something else when the alarm is going off. But the problem is when the alarm is activated and deactivated with the remote it makes a beep noise. So if I can build a circuit that will only be activated after 5seconds or so it will work.

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ericgibbs said:

hi,
Get the datasheet for the 555 timer ic.

Datasheet Archive - Free Datasheet Search Engine :: PDF Datasheets :: Data Sheet :: Datasheet :: Application Note : ??? : ??? : ???? : ????? : ??????? : Fiche technique : Datenblatt : ????????

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