Car Alarm : Start System
 
      Car Alarm in this circuit is designed for protect your car from burglarize. It simple to build .In figure 1 SW 1have for test after Push Botton on SW1 you have time about 10 to 15 seconds Relay will be operate.The contactor of Relay connect to siren or Horn
  
 
 
Figure 1. Schematics of   Car Alarm
     If you choose to use the Horn - remember that the alarm relay is too small to carry the necessary current. Connect the coil of a suitably rated relay to the "Siren" output. This can then be used to sound the Horn - flash the lights etc.  
Data sheet :
 
 
   
     
1N4148
 
Relate Links & Other Circuit :
Motorcycle Alarm Number 2
This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch 
 
Car alarm

A car alarm is an electronic device installed in a vehicle in an attempt to discourage theft. Car alarms work by emitting high-volume sound (usually a siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination thereof) when triggered or when circuit is breached.

  
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