Showing posts with label Zone. Show all posts
Showing posts with label Zone. Show all posts
Sunday, November 2, 2014
Alarm System Circuit 5 Zone
This is a complete alarm technique with 5 self-governing zones fit in favor of a tiny organization or else to your house nature. It uses slightly 3 CMOS ICs and skin tone a timed submission / exit zone, 4 immediate zones and a panic button. nearby are indicators for both zone a "scheme armed" indicator. The schematic is at the same time as follows:
Circuit remarks
both zone uses a normally stopped up write to. These can ensue micro switches otherwise standard alarm contacts (frequently reed switches). right and proper switches can be bought from alarm shops and concealed fashionable gate frames, before window ledges.
Zone 1 is a timed zone which necessity be situated used in the function of the submission and exit feature of the building. Zones 2 - 5 are immediate zones, which choice trigger the alarm with veto delay. several RF invulnerability is provided pro extensive wiring runs by the input capacitors, C1-C5. C7 and R14 too form a transient suppressor. The main switch acts the same as the normal/Unset and Reset switch. For nice security this ought to subsist the metal type with a key.
Action
by switch on, C6 choice charge via R11, this acts as the exit delay and is set to around 30 seconds. This can be altered by unstable either C6 before R11. once upon a time the timing dot has elapsed, LED6 will light, gist the regularity is armed. LED6 may perhaps transpire mounted externally (on the bell box on behalf of case) and provides visual indication with the purpose of the system has set. one time set some get in touch with that opens motivation trigger the alarm, counting Zone 1. To prevent triggering the alarm on entrance to the building, the concealed regarding-entry switch be obliged to live operated. This will discharge C6 and start the entry timer. The re-entry switch may well be a concealed reed switch, located anywhere dressed in a entry frame, but indistinguishable to the eye. The panic switch, after hard-pressed, wish trigger the alarm when backdrop. Relay contacts RLA1 provide the latch, RLA2 organize the warning otherwise buzzer.
Friday, October 17, 2014
5 Zone Alarm System
This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CMOS ICs 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:
Circuit Notes
Each zone uses a normally closed contact. These can be micro switches or standard alarm contacts (usually reed switches). Suitable switches can be bought from alarm shops and concealed in door frames, or window ledges.
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 suppressor. The key switch acts as the Set/Unset and Reset switch. For good security this should be the metal type with a key.
Operation
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.
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 suppressor. The key switch acts as the Set/Unset and Reset switch. For good security this should be the metal type with a key.
Operation
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.
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