hai i need material related to burglar alarm using 555 and ldr. i kindly request u to send me the required material for poject. ....etc

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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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please show report on the investigatory project fire Alarm full report ....etc

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to get information about the topic fire alarm using ldr RELATED TOPIC refer the page link bellow

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

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The circuit illustrated here is used as Burglar alarm. LDR is kept at such a place that when thief enters our house then a shadow will fall on the LDR. A small beam of light source is also needed to supply continuous signal to LDR. For best Light source we can use Laser diode which will work for few km. For home use Infra Red LED s will be good and will be tricky to thief and works with same efficiency at night.

This circuit uses a popular timer I.C which is 555. I.C 555 is connected as comparator with pin 6 connected with positive supply, t ....etc

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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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To get full information or details of fire alarm using ldr please have a look on the pages

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

if you again feel trouble on fire alarm using ldr please reply in that page and ask specific fields in fire alarm using ldr ....etc

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complete info about fire alarm sys using ic555

The purpose of a fire alarm system is to detect the unwanted presence of fire by monitoring environmental changes (such as temperature changes) associated with combustion. The Fire Alarm presented here is a simple fire detecting circuit employing a germanium diode (DR25) as the fire sensor (Thermistor in the circuit diagram should be replaced by this germanium diode). This fire detecting sensor utilizes the simple fact that in case of fires the room temperature rises rapidly, reaching temperatures ....etc

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