Alarm of 5 entrances
This it is an alarm system that has 5 independent zones, one of which has a retardation that will be the zone that we will place in the input/output of our department or office, rest 4 are of instantaneous action. Also it owns a panic button, which pressing also drives it the alarm in instantaneous form. The circuit is the following one:
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List of components |
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1/4 resistance 5% W - R1, R3, R5, R7, R9, R14 - 100 KW - R2, R4, R6, R8, R10, R12 - 1 KW - R11 - 220 KW - R13 - 10 KW |
Capacitores - C1, C2, C3, C4, C5 - 100 nF - C6 - 100 uF - C7 - 1 uF |
Semiconductors - D1, D2, D3, D4, D5, D9 - Diodes LED - D6, D7, D10 - 1N4148 - D8 - 1N4001 - Q1 - 2N3904 - IC1 high frequency - CMOS 4050B - IC2 - CMOS 4082B - IC3 - CMOS 4072B |
Several - 5 Contacts normal closed - 2 Contacts normal abierto - Battery 12 V - Siren - Relay |
The contact indicated with number 1 is the one that the retardation owns and the one that is going to be placed in the input/output. The other numbered zones from 2 to 5 are the zones of immediate action. The contacts normal are closed, except for the panic pulser that normal is abierto. The capacitor C6 and the R11 resistance are those that provide the time with retardation (approx 30 seconds), this time can be modified changing the value of some of these two components. Once passed east time the alarm it will be activated and the LED D9 will ignite. When D9 is ignited, the opening of anyone of the contacts will make activate the alarm. In order to avoid that the alarm activates when we entered the department or office, we will have to unload the capacitor C6 to recover therefore the time of retardation, the form to do it is beating on entered the Re key, which will be hidden somewhere external of the department. When pressing the pulser Panic the alarm will go off very instantaneously.
