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Title: automatics on off street light using 741 ic ldr
Page Link: automatics on off street light using 741 ic ldr -
Posted By: pranamya
Created at: Thursday 17th of August 2017 08:12:35 AM
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automatics on off street light using 741 ic ldr
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Title: analog to digital converter circuit using ic 741
Page Link: analog to digital converter circuit using ic 741 -
Posted By: shefi
Created at: Thursday 17th of August 2017 08:14:58 AM
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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

if you again feel trouble on simple touch alarm circuit please reply in that page and ask specific fields in simple touch alarm circuit ....etc

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Title: simple rain sensor using ic 555 ppt
Page Link: simple rain sensor using ic 555 ppt -
Posted By: sathi
Created at: Thursday 05th of October 2017 04:31:29 AM
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Rain alarm is an application which detects the rain water and blows alarm. They are useful devices and play an important role in various industries such as automobile, irrigation, and wireless communication. Desiging a rain alarm system is quite simple and we have designed here a demo rain alarm project with the help of 555 Timer IC.

Components

Rain sensor (Either you can purchase or build yourself)
555 Timer IC
NPN Transistor BC547
Resistors (470, 100k and 1k ohm)
Capacitor (10uf)
Buzzer
Battery 9v

The main component of this rain alarm is ....etc

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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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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 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: rain alarm using 8051
Page Link: rain alarm using 8051 -
Posted By: sumitchauhanengg
Created at: Thursday 17th of August 2017 06:54:55 AM
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Title: mini projects using op amp lm 741
Page Link: mini projects using op amp lm 741 -
Posted By: maza
Created at: Thursday 17th of August 2017 04:52:22 AM
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Title: rain alarm using 741
Page Link: rain alarm using 741 -
Posted By: musthu
Created at: Thursday 05th of October 2017 04:49:31 AM
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Project report on rain alarm ....etc

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