| 摘要 |
A backup arrangement for alarm system includes an electronic switch circuit, a DC power source, a build-in electronic Hi-sounder, and a chargeable resistor. The electronic switch circuit, which is a IC control system, has a power input connected to an auxiliary power output of a control panel of a burglary alarm system installed in house or vehicle, and an alarm input connected to an alarm output of the control panel. The electronic switch circuit further includes a normally opened switch and a normally closed switch. The normally closed switch is coupled in series with the alarm output of the control panel and the input of the build-in electronic Hi-sounder. The DC power source has an output connected in series with the normally opened switch and the input of the build-in electronic Hi-sounder. An alert output is connected to a system warning device of the burglary alarm system. Accordingly, when the control panel and wiring are vandalized that the auxiliary power output losses its voltage or power or that the system warning device is shock off or damaged, then the normally closed switch is switched to an open condition and the normally opened switch is switched to a close condition. At that time, the DC power source will energize the builder-in electronic Hi-sounder to provide Hi-pitch warning alarm.
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