Position: Index >

Single zone alarm circuit

2016-02-20 01:23  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

This article describes a single-zone alarm circuit theory. I suggest you to understand the principle of combining circuit. The circuit features automatic entry and exit delays, timed bell cut-off and the system is reset. It provides a normally open and normally closed switch will suit the usual input devices (pressure pad, magnetic reed contacts, foil tape, PIRs and inertial sensors). When power is applied, if there is a fault  buzzer  will sound and you should turn off again and check for open doors, windows, and so on. If everything is in order beeper will sound and export delay will begin. You have about 30 seconds to leave the building. When you return to the buzzer will sound. Then you have about 30 seconds to turn off; otherwise the alarm sounds. It will probe indefinitely. However, if the building is a reinsurance security alarm will turn off after about 10 minutes, the alarm will reset. Exit delay, and Bell entry deadline can be changed by changing the value of R4, R12 & R13 respectively. Q5 and progress to ensure that the input delay and Bell cut-off timer is always the first C7 either fully charged or fully due to requirements. If you can live with slightly less precise intervals and then left the Q5, progress, R14, R15, R16 "is given, R17, C8 & C9. If you do not want a bell cut-off at all then left the D3 as well. inertial sensor sensitivity adjustment R8. sets to a minimum, tap will activate the alarm set to the maximum value, you need a heavy blow, if you do not use inertial sensors and then replace with a fixed resistor 27 k R8, if you do not use normally open switch and then left R1, C1 & Q1 and fit a link betw1een R2 and C2.


sza2 single zone alarm

Veroboard Layout:
sza2 lay single zone alarm