How To Make Micro Frequency Modulation Emitting Machine

This paper introduces a method of making micro frequency modulation emitting machine as well as work principle of the machine.In this machine,the microphone transforms the sound into the audio fre-quencysignal.Afterbeingamplified,the audio frequencysignal modulates the carrywave to produce frequen-cy modulation wave.Then the antenna emits the frequency modulation electromagnetic wave outwardly.Us-ing the frequency modulation radio,you can hear the clear sound.