How can sound energy be converted into electrical energy without any input power supply?
Hi friends. Basically what i want is to convert sound energy into useful electrical energy,i read a lot for this,many advised to use microphone for this,but the internal circuit of that showed that it requires a input power supply which actually i don’t want to take,that supply is basically used by amplifiers(op-amp) to amplify the signals. so please do not advice anything that requires an input other than sound energy. I seriously want a genuine help from all please guide me to the best you can Thanks in advance >,i read a lot for this,many advised to use microphone for this There are microphones designed specifically to do this. They are used in sound powered telephones. The second link below shows a diagram of how they work. For demonstration purposes, you should be able to show electrical generation by connecting a common magnet/coil or piezoelectric speaker to an oscilloscope and making a loud noise. Both of these types of speakers are reversible, that is, driving the speaker cone
