Don't know what to call this circuit - Electronic Circuits Projects Diagrams Free

Kadett200is · 13th January 2009, 12:35 PM

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.

ericgibbs · 13th January 2009, 12:39 PM

Quote:

Originally Posted by Kadett200is

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.

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 : ????????

555 Timer/Oscillator Tutorial

Kadett200is · 13th January 2009, 01:23 PM

Quote:

Originally Posted by ericgibbs

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 : ????????

555 Timer/Oscillator Tutorial

Thanx. Will look through it.

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13th January 2009, 12:35 PM	#1
Kadett200is	Don't know what to call this circuit 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.