汽车电路图是利用图形符号和文字符号,表示汽车电路构成、连接关系和工作原理,而不考虑其实际安装位置的一种简图。为了使电路图具有通用性,便于进行技术交流,...
报警控制中的Zone Alarm System
相关电路图:
4082 2N3904 4050 4072
This is a complete alARM sySTem with 5 independent zones suitable for a small office or home environment. It uses just 3 CMOS IC's and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a "system armed" indicator. The schematic is as follows:
Each zone uses a normally closed contact. These can be micro switches or standard alarm contacts (usually reed switches). Zone 1 is a timed zone which must be used as the entry and exit point of the building. Zones 2 - 5 are immediate zones, which will trigger the alarm with no delay. Some RF immunity is provided for long wiring runs by the input capacitors, C1-C5. C7 and R14 also form a transient suppresser. The key switch acts as the Set/Unset and Reset switch. For good security this should be the metal type with a key. At switch on, C6 will charge via R11, this acts as the exit delay and is set to around 30 seconds. This can be altered by varying either C6 or R11. Once the timing period has elapsed, LED6 will light, meaning the system is armed. LED6 may be mounted externally (at the bell box for example) and provides visual indication that the system has set. Once set any contact that opens will trigger the alarm, including Zone 1. To prevent triggering the alarm on entry to the building, the concealed re-entry switch must be operated. This will discharge C6 and start the entry timer. The re-entry switch could be a concealed reed switch, located anywhere in a door frame, but invisible to the eye. The panic switch, when pressed, will trigger the alarm when set. Relay contacts RLA1 provide the latch, RLA2 operate the siren or buzzer.
相关文章
- 详细阅读
-
教你怎么看电路图,各种电路图形符号大全详细阅读
电子设备中有各种各样的图。能够说明它们工作原理的是电原理图,简称电路图。电路图有两种,一种是说明模拟电子电路工作原理的。它用各种图形符号表示电阻器、电...
2024-04-26 341 电路图
- 详细阅读
- 详细阅读
-
报警控制中的串联/并联回路报警器详细阅读
两个可控硅用于两个传感器回路里。一个回路使用串联交换机,另一个回路使用并联交换机。当开关开动时,可控硅触发。报警器属于无干扰型。 &nbs...
2024-04-14 167 报警控制
- 详细阅读
发表评论