VEHICLE THEFT ALARM AND CONTROL DEVICE
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Abstract
THE TRIGGER CIRCUIT OF A SILICON-CONTROLLED RECTIFIER IS MANUALLY INTRODUCED INTO THE ELECTRICAL SYSTEM OF AN INTERNAL COMBUSTION ENGINE BY THE FIRST POSITION OF A TWO POSITION SWITCH SO THAT CLOSING OF THE IGNITION CIRCUIT PROVIDES A TRIGGERING PULSE WHICH BIASES THE SILICONCONTROLLED RECTIFIER INTO CONDUCTION TO SUPPLY CURRENT TO A HORN. THE RESISTANCE OF THE TRIGGER CIRCUIT ALSO PREVENTS FUEL IGNITION AND THE SWITCH MUST BE MOVED INTO ITS SECOND POSITION TO PERMIT IGNITION AND TO DEENERGIZE THE HORN.
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