The circuit shown in the figure consists of an external dual or non-gate driver integrated chip SN75454B, four different alarm sensors and power supply circuits. The chip SN75454B is a product produced by Texas Instruments.
When the action of the thief causes any one of the four different alarm sensors to issue an alarm logic signal, the alarm relay will be pulled in and an alarm signal will be issued. If two SN75454B chips are used in the circuit, an eight-way alarm can be formed. To meet the needs. Multiple SN75454B chips can be used to form more alarms.
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