FIRE ALARM PROJECT PDF
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accomplish these goals. This paper specifies various circuits for detecting fire. Keywords: Diodes, fire, alarm, thermistor. 1. Introduction. A fire alarm circuit is. This is a simple fire alarm circuit using Germanium Diode and timer. In this circuit Germanium Diode play very important role in detecting the fire. This circuit . Here is a simple fire alarm circuit based on a LDR and lamp pair for sensing the sppn.info alarm works by sensing the smoke produced during sppn.info circuit.
Fire alarm systems have become increasingly sophisticated and functionally more capable and reliable in recent years.
They are designed to fulfil two general requirements: protection of property and assets and protection of life. As a result of state and local codes, the life-safety aspect of fire protection has become a major factor in the last two decades.
There are a number of reasons for the substantial increases in the life-safety form of fire protection during recent years, foremost of which are 1. The proliferation of high-rise construction and the concern for life safety within these buildings. A growing awareness of the life- safety hazard in residential, institutional, and educational occupancies. Increased hazards caused by new building materials and furnishings that create large amounts of toxic combustion products i.
Vast improvements in smoke detection and related technology made possible through quantum advances in electronic technology.
The passing of the Americans with Disabilities Act ADA , signed into law on July 26, , providing comprehensive civil rights protection for individuals with disabilities. In this state, it will turn on the next transistor, i. This transistor will now act as a switch for the siren circuit.
This transistor can bear power quite larger than the BC and it is also equipped with a heat sink for that purpose. When the current is passing, the siren circuit which is assembled as the load to the circuit is turned ON. Then you can hear the siren sound through the buzzer. The capacitors used in the circuit are the main components in producing the siren effect. The principle involved in generating the siren effect is to make an oscillator with an envelope which periodically increases and decreases so as to generate that effect.
Related Post: Pull Pin Security Alarm Circuit.
Simple Fire Alarm Circuits at Low Cost
Here is another small project on fire alarm. When a fire accident is happened in home or office, it will detect the fire and give the alarm. The thermistor is the main component which detects the fire by sudden change in the room temperature because of the heat generated by the fire. The op-amp will make the NE to generate pulse which has been given to a buzzer to buzz. LM is an operational amplifier which will work according to the difference in the input voltages.
LM has following features like high current driving, voltage gain, noise amplification and also provide low output impedance. LM can also use as a short circuit protection. Remote Operated Alarm Circuit.
CHOOSING R1, R2 AND C1
This is a simple fire alarm circuit using Germanium Diode and timer. In this circuit Germanium Diode play very important role in detecting the fire. This circuit is very easy to construct, cost effective and implementable. Here is the simple fire alarm circuit which costs less than rupees. The key component in the circuit is DR25 germanium diode whose resistance will decrease with increase in temperature.
project report fire alarm
The conduction of germanium diode will start at 70 degrees. So we may use germanium diode as a heat sensor.
When the temperature is more than 70 degree, the germanium diode will conduct and trigger the NE timer through a transistor. The NE is configured in astable Multivibrator and make the buzzer to alarm when germanium diode conducts. Here op amp acts as non-inverting comparator i. When there is no any fire, voltage at pin 2 of the comparator is greater than the voltage at pin3.
When there is no fire resistance of thermistor is 10k.
So 10K and 4. Voltage at pin2 is calculate using formula. When there is any fire thermistor temperature raises and its resistance decreases. So voltage at pin2 starts decreasing. Thus Vout is goes to positive i. Here reference voltage selected is 6v. Fire alarm starts only if the input voltage is less than 6v.
project report fire alarm
To increase the reference voltage decrease the resistance of pot. In this circuit Germanium Diode play very important role in detecting the fire. This circuit is very easy to construct, cost effective and implementable.
The key component in the circuit is DR25 germanium diode whose resistance will decrease with increase in temperature. The conduction of germanium diode will start at 70 degrees. So we may use germanium diode as a heat sensor. When the temperature is more than 70 degree, the germanium diode will conduct and trigger the NE timer through a transistor.
The NE is configured in astable Multivibrator and make the buzzer to alarm when germanium diode conducts.If there is fire accident, it will sense and make the alarm.
At this condition the astable multivibrator cannot produce frequency. LM has following features like high current driving, voltage gain, noise amplification and also provide low output impedance.
It is already verified and is working very fine.
Sagar Bhardwaj. The suppression system is electrical components. Diode must be connected to the circuit in reverse bias.
Components of the circuit should be handled carefully.
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