Introduction: Simple IC-555 Sound Generator
This is a simple sound generator can be used for various purpous such as a alarm , bell, police siren ,electronic mosquito repellent , .this project uses a multivibrator in astable mode -ic 555 , which produces the desired frequency by altering the external components i.e- resistor and capacitor.and hence is best example of ic-555 application as a beginner...check out the given link for details..http://www.electro-bash.blogspot.in/