TURING INDICATOR WITH SOUND

2TP07

2B-TURNING INDICATOR WITH SOUND

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PROJECT SPECIALITIES

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This project moves you from accedents and traffic rules.  It contunues to be OFF and ON automatically.    One speciality with the project is that it produces round along with turning light.   You can attach this project to your car , scooter, motor cycle or cycle

 

TECHNICAL DESCRIPTION AND WORKING

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This project has been developed and successfully tested O.K at TV Engineers Technical Lab.

The project is based on IC 555,which is a popular integrated circuit and can be used in digital as well as analogue circuits.  This can also be employed in input and output of any TTL or CMOS loggic circuits.   Here the IC works as monostable multivibrator.   Square wave output is available at pin No3.  The OFF/ON time interval if turning indicator light can be increased or decreased by adjusting the preset .   The rest of the circuit is meant for sound generations.   When the voltage at pin No 3 of the IC 555 becomes high the sound circuit starts working.  The output pulse available at pin No3 is fed to the base of transistor BC 148,which amplifies the pulse.  But the amplification at this stage is very weak.  So for our then amplification an additional transistor AC 128 is utilized.  The pulse amplified by AC 128 is fed to the speaker which produces sound.    Desired tone can also be desired by increasing the value of 10E resistance connected to the emitter upto 47E and change the value of the capacitor .02 MF .  Musical tone can also be obtained by using musical IC,if readers want.

PRECAUTIONS WHILE ASSEMBLING

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1.Use IC base for mounting IC 555 .  The heat and current leackage of soldering iron may damage the IC.

2.Be careful about the polarity of the capacitor connected to pin No 6 of IC

3.Use speaker of low wattage.

4.Other wise output iron wisher may set damaged

5.Avoid short circuit while soldering

 

LIST OF COMPONENTS

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