| 摘要 |
PURPOSE:To simplify the formation of wiring for a sensor as wall as to secure such a burglar informer that is simple in structure and cheap in price, by installing a sensor circuit, a time constant circuit and a relay circuit altogether, while connecting a part of the sensor circuit to a box body of a broadcasting radio receiver. CONSTITUTION:In case of a broadcasting radio receiver to be attached to an automobile, there are provided with a sensor circuit 1, a time constant circuit 2 and a relay circuit 3, while a part of this sensor circuit 1 is connected to a box body of the broadcasting radio receiver. With this constitution, a sensor is connected to the box body of the broadcasting radio receiver so that a detecting current flows therein. Therefore, if the box body of the radio receiver is separated from a car body, no current flows in the sensor. In consequence, the sensor circuit is operated, operating the time constant circuit 2 and the relay circuit 3, so that a burglar alarm is emitted. |
