How to make door Alarm Circuit using scr

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 Door Alarm using SCR

   SCR ( silicon controlled Rectifier) also called Thyristor is a  semiconductor controlled rectifier is a four layer solid state current controlling device.

Components :

1. 1 × Low Power scr
2. 1 × 9v Battery
3. 1 × buzzer
4. 2 × Switches
5. 1 × 1k ohm resistor ( may be vary)

Circuit Diagram :

door alarm using scr
Door Alarm system using SCR


Working :

1. Make circuit as per Circuit Diagram.
2. Place switch in on door in that way when door is open, switch is closed.
3. When Switch is closed a triggering pulse apply to gate and scr is turn on.

Attention :
  To turn off  buzzer place one more switch between positive terminal and scr anode.
OR remove Battery 

  


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