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Word Count: 841
Conversion of sound to light is useful sometimes such as sound indicator simple sound-to-light unit for music and for the hearing impaired for example indicate the telephone or doorbell However sound exists as wave form Unlike temperature it is hard to detect sound and transfer to LED lights There are three main problems in the transformation process from sound to light First as the sound detection part electrets microphone can only provide small signals since its simple structure These small signals are hardly to be used by other elements in the sound to light circuit Second some noise sound might interfere the conversion of the LED light signals Third some sound it too quick to be captured for the unit It is possible to fix these issues by adding some simple elements such as bipolar junction transistors and capacitors in the sound-to-light unit This sound-to-light unit uses a built-in electrets microphone with consumption of 05mA min12mA max A 9 volts battery is used as a power source The electric circuit contains four red LEDs as the light element A potentiometer RV1 is used to change the detected sensitivity of the circuit and the power gain thus controls the LEDs light range This electric circuit contains three important parts electrets microphone transistor amplifier and buffer element To light the LEDs the first thing of the circuit needs to do is to detect the sound signal In this case an electrets microphone is needed The microphone contains a field effect transistor and a capacitor The sound detection range is about 60cm around the microphone Its job is to detect the air vibration from the sound or direct contact the microphone and converts them as electron output signals by internal amplification and it polarises the electrets When the air vibrates caused by sound the diaphragm also vibrates
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