some one please help me here
I'm getting constant beeping instead of beep beep beep!!!

 

We need a schematic and I can't see one from your link. Lots of comments requesting a schematic.

 

His diagram not matching with his vdo! That's the problem. Cant we create beep beep beep with 2 npn ?
Here is the confusing digram from him> https://innovation-kh.blogspot.com/2017/07/how-to-make-easy-automatic-door-alarm.html?m=1

 

Here is the confusing diagram ! Not matching with his vdo!

 

The two capacitors in that diagram are shown connected the wrong way round - so that's a a start.

 

The two capacitors in that diagram are shown connected the wrong way round - so that's a a start.

sorry mate, i know nothing about electronics! could you more specified ?

 

The capacitors used in this design are polarised - they need to be connected the right way round or they will not work. The diagram shows them the wrong way round. The positive wire of each capacitor should connect to the collector of the transistor and the negative shoud connect to the base.

 

The capacitors used in this design are polarised - they need to be connected the right way round or they will not work. The diagram shows them the wrong way round. The positive wire of each capacitor should connect to the collector of the transistor and the negative shoud connect to the base.

thank you mate. tonight i will try and post result. should i alter LED polarity too ? COZ i see positive cap polarity connected to the LED negative!

 

The LED is correct. Its positive terminal is connected to battery positive.

 

What is the model number of your motion detector receiver?

You can test your annunciation circuit pretty easily.

You can put the 5 volts at the 5V point as well as the Enable point (where the IR detector will go eventually). If your circuit is as drawn, your buzzer will sound at approximately 18 Hz. If the alarm is constant on when you energize it with 5V, the circuit will pulse that sound at an approximately 18 Hz rate.

Are you attempting to replicate the instructable or do you have your own design specifications in mind?

The pdf is what I think you have for a motion detector. You can confirm or deny.

 

Good point. With the values given it will not 'beep, beep, beep' it will warble continuously!
To make it sound like the one in the video the two capacitors would need to be 100uF - 200uF.