hey you can refer http://www.kitsnspares.com in India
this will provide the spares,ic's,electrical and electronic components
they will send you by post to any where in India
i have the simulation software named national instruments multisim work benh but there is no student version for it will you have any knowledge about the student simulation softwares whiuch are provided to the student
sound energy cannot transformed into the eletrical energy first it is turned into mechanical energy as vibrations and thes are converted into eletrical as this principle used in micro phones
the CE configuration amplifier is used as power amplifier but it not stable at high frequencies
you can change both current and voltage inthe ce configuration
if you want to increase the voltage gain you have to change configuration
you can connect them in series or parallel but the number of leds to be placed is based on the input power given given to leds if the limit of leds placed exceeds then the light intensity will be low
its very simple you will found two terminals of the speaker and i think your head phone have three or four wires
on the pin of the head phone you will find three layers
Remove the enamel coating on the terminals and connect you will get output
you can build it by only stuying in the books
the links are
www.intel.com/design/mcs51
www.atmel.com
www.semiconductors.phillips.com
www.sci.siemens.com
www.dalsemi.com