To get full information or details of working and principle of antisleep alarm for student please have a look on the pages

http://seminarsprojects.net/Thread-antisleep-alarm-for-students?pid=53288#pid53288

if you again feel trouble on working and principle of antisleep alarm for student please reply in that page and ask specific fields in working and principle of antisleep alarm for student ....etc

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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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i want detailed working principle of intercom circuit for my 3rd sem electronics project plz mail to [email protected]..

sohil parikh ....etc

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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

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

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i got the simple circuit for making rain alarm..it consists of 2 transistors,2 resistances,capacitor.alarm,battery,etc..can you plz tel me what is the working principle?..how current flows,what is the use of transistor in it ,etc,etc.. ....etc

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This simple Touch Switch is developed by using 555 timer IC operated as a MONOSTABLE vibrator. Here the stable stage is LOW, so the timer outputs low after the trigger is removed. Basically in this circuit we will have a LED which turns ON when we touch a pin of timer. The LED will be ON for the time during which the trigger is present. Once the trigger is removed the LED turns OFF.

Circuit Components

+4 to +6 supply voltage
555 IC
470 , 100K resistors
10 F, 100nF (104) capacitors
LED
Touch plates

Circuit Diagram

Simple T ....etc

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l need information regarding simple touch alarm ucing ic555 ....etc

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To get full information or details of simple touch alarm circuit please have a look on the pages

http://seminarsprojects.net/Thread-touch-sensitive-alarm

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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 or information regarding simple touch alarm using ic555 ....etc

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