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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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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simple touch alarm circuit using ic 555 ppt

Touch the sensor of the alarm with your finger and it starts beeping, goes on for some time and then stops. Touching it again, and it goes again! This little and flexible circuit consists of a touch sensor and a directly coupled transistor amplifier with a small loudspeaker as the output load. Two sensor strips of metal are mounted side by side on a 1 1 cm size micasheet and connected to the input of the circuit.

How the touch alarm works

Under normal conditions no current flows through switching ....etc

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abstract for touch alarm using ic555
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i need an abstract for touch alarm using ic555 ....etc

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i give information about project ....etc

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In the past, hardwired alarm systems are the only choice for customers who need security equipment to protect premises. Today, with rapid technology evolve, many users shift from hardwired alarm to wireless alarm. It seems home security industry is moving from hardwired to wireless, but as one of mature and stable alarm equipment, some users still favor the hard wired alarm system. In this article, we will show you some basic information about advantages and disadvantages of hardwired alarm systems.

What s hardwired alarm system ?

Alarm ....etc

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diploma level students, seminar repot rtc seven segment clock, find a code for hbridge dc motor drive in vhdl, h bridge vhdl, electronics projects for diploma students, diploma level electronics mini, project for diploma electronics student, http ww seminarprojects com thread a big electronics projects list for diploma or engineering students, simulink file for designing of ic 565, project on traffic light controller multiway with circuit working, list of electronic projects, project automatic parking system use of electronic devices at diploma ....etc

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To get full information or details of anti sleep alarm for students mini project please have a look on the pages

http://seminarsprojects.net/Thread-antisleep-alarm-for-students

if you again feel trouble on anti sleep alarm for students mini project please reply in that page and ask specific fields in anti sleep alarm for students mini project ....etc

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to get information about the topic light sensitive alarm with timer 555 full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-light-sensitive-alarm ....etc

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I made an alarm using LDR(light dependent register). The alarm work depending on the light intensity, when light intensity will low then the alarm will rise up and when the light intensity will high then it remain off. My problem is that the buzzer is not playing continuously when the intensity is low. I need a continue beep and a reset button to reset the device and also the alarm.
Sorry, for my bad English. ....etc

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