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Title: ppt on fire alarm using thermistor circuit
Page Link: ppt on fire alarm using thermistor circuit -
Posted By: siyad R
Created at: Thursday 17th of August 2017 05:45:28 AM
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Many fire alarm circuits are presented here,but this time a new circuit using a thermistor and a timer to do the trick. The circuit is as simple and straight forward so that, it can be easily implemented. The thermistor offers a low resistance at high temperature and high resistance at low temperature. This phenomenon is employed here for sensing the fire.

The IC1 (NE555) is configured as a free running oscillator at audio frequency. The transistors T1 and T2 drive IC1. The output (pin 3) of IC1 is couples to base of transistor T3 (SL100), w ....etc

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Title: project file content needed for FIRE ALARM CIRCUIT
Page Link: project file content needed for FIRE ALARM CIRCUIT -
Posted By: hitesh_frnds
Created at: Thursday 17th of August 2017 05:15:46 AM
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project file content needed for FIRE ALARM CIRCUIT

Working of fire alarm circuit
Working is based on the switching property of transistor.
The thermistor and R1 forms a potential divider network which drives the transistor.
The heart of this circuit is a thermistor. Thermistors are low-cost, easily-available temperature sensors widely used for uncomplicated temperature measurements.
Thermistors are temperature sensitive resistors. When temperature increases resistance offered by the thermistor decreases and vice versa. At normal temperature, t ....etc

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Title: fire alarm circuit using microcontroller 8051
Page Link: fire alarm circuit using microcontroller 8051 -
Posted By: sitikanthaz
Created at: Thursday 17th of August 2017 06:03:15 AM
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I urgently need a fire alarm circuit that detects heat using lm35 sensor(using adc to convert analog to digital) and after the temperature exceeds a said limit (say 50deg) the buzzer starts to buzz..please help urgently!! ....etc

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Title: advantages and disadvantages of a fire alarm using thermistor
Page Link: advantages and disadvantages of a fire alarm using thermistor -
Posted By: anjukrishnaj7
Created at: Thursday 17th of August 2017 05:05:33 AM
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fire alarm using thermistor
advantages and disadvantages
The IC1 (NE555) is configured as a free running oscillator at audio frequency. The transistors T1 and T2 drive IC1. The output (pin 3) of IC1 is couples to base of transistor T3 (SL100), which drives the speaker to generate alarm sound. The frequency of NE555 depends on the values of resistances R5 and R6 and capacitance C2. When thermistor becomes hot, it gives a low-resistance path for the positive voltage to the base of transistor T1 through diode D1 and resistance R2. Capacitor C1 ....etc

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Title: working principle of fire alarm using thermistor
Page Link: working principle of fire alarm using thermistor -
Posted By: tinu
Created at: Friday 06th of October 2017 03:10:50 PM
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To get full information or details of fire alarm using thermistor please have a look on the pages

http://seminarsprojects.net/Thread-simple-fire-alarm-circuit

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Title: Simple Fire Alarm Circuit
Page Link: Simple Fire Alarm Circuit -
Posted By: kolisagar48
Created at: Thursday 17th of August 2017 04:56:51 AM
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Simple Fire Alarm Circuit
Here is a simple fire alarm circuit based on a LDR and lamp pair for sensing the fire.The alarm works by sensing the smoke produced during fire.The circuit produces an audible alarm when the fire breaks out with smoke.
When there is no smoke the light from the bulb will be directly falling on the LDR.The LDR resistance will be low and so the voltage across it (below .6V).The transistor will be OFF and nothing happens.When there is sufficient smoke to mask the light from falling on LDR, the ....etc

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Title: pcb layout of temperature controlled fan using thermistor thermistor and ic 741
Page Link: pcb layout of temperature controlled fan using thermistor thermistor and ic 741 -
Posted By: varun
Created at: Thursday 05th of October 2017 04:49:31 AM
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I am looking for PCB layout of temperature controlled fan using thermistor and IC 741. Can anyone help, please? ....etc

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Title: advantages of fire alarm using thermistor in pdf
Page Link: advantages of fire alarm using thermistor in pdf -
Posted By: veena_niit
Created at: Thursday 17th of August 2017 04:43:08 AM
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Hi,am a college student doing a project on fire alarm using a thermistor. i humbly need your help in my project and your help will be much appreciated. i need advantages of using this kind of fire alarm. ....etc

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Title: circuit diagram of fire alarm using microcontroller 8051
Page Link: circuit diagram of fire alarm using microcontroller 8051 -
Posted By: davisth48
Created at: Thursday 17th of August 2017 05:30:07 AM
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http://circuitstodaywp-content/uploads/2012/10/thermometer-using-8051.png

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Title: abstract for fire alarm using thermistor
Page Link: abstract for fire alarm using thermistor -
Posted By: sweet_neha
Created at: Thursday 17th of August 2017 04:46:35 AM
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