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P04- Simple burglar alarm wïth LED Indication and sound

P04- Simple burglar alarm wïth LED Indication and sound

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  ELECTRONIC EXPERIENCE

Project 4: Simple burglar alarm wïth LED Indication and sound.

Make an alarm signal sound when the circuit is interrupted...
 
Required parts: 9V battery*, 1K resistor (brown black red gold), 100K resistor (brown black yellow gold), red LED, BC547 transistor, buzzer, 0,5m supplied wire.
 
How it works: An alarm sounds when the normally closed security circuit (hère indicated as 'WIRE') is interrupted. Replace   this    normally   closed    circuit (WIRE) by a normally closed window or i door  switch;  when  e.g.  the  window  is opened   the  contact  within  the window _ switch is interrupted, the security circuit is opened and the buzzer sounds. The alarm signal ends as soon as the security circuit is closed again.

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