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Title: simple touch alarm using ic 555
Page Link: simple touch alarm using ic 555 -
Posted By: britjet13
Created at: Thursday 05th of October 2017 05:24:59 AM
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Title: working principle of rain alarm circuit
Page Link: working principle of rain alarm circuit -
Posted By: ankita
Created at: Thursday 17th of August 2017 08:44:47 AM
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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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Title: simple touch alarm circuit
Page Link: simple touch alarm circuit -
Posted By: kartikay
Created at: Thursday 05th of October 2017 05:12:46 AM
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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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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: working principle of simple intercom
Page Link: working principle of simple intercom -
Posted By: nisha317
Created at: Thursday 17th of August 2017 05:21:10 AM
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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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http://seminarsprojects.net/Thread-simple-fire-alarm-circuit

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Title: simple touch alarm using ic555 ppt
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Posted By: Jitender Rawat
Created at: Thursday 05th of October 2017 04:49:04 AM
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Title: working principle of simple touch alarm pdf
Page Link: working principle of simple touch alarm pdf -
Posted By: amitabh_shahrukh2
Created at: Thursday 17th of August 2017 08:12:06 AM
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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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Title: working and principle of antisleep alarm for student
Page Link: working and principle of antisleep alarm for student -
Posted By: arkanathsastry
Created at: Thursday 17th of August 2017 08:31:10 AM
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Title: simple touch alarm circuit using ic 555 ppt
Page Link: simple touch alarm circuit using ic 555 ppt -
Posted By: VENKYSANDEEP
Created at: Thursday 17th of August 2017 06:03:44 AM
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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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