Similar to the Radio Microphone, in this post I will show you how to build your very own radio transmitter by replacing the Microphone with a 3.5mm headphone jack. This can be used as a Radio MP3 player for your car, simply plug your phone into the 3.5mm headphone jack then tune your car radio into the same frequency as the modulator and what ever is playing on your phone
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Radio microphones are used extensively by stage performers and professional eavesdroppers (Spies) but they can also be used for other fun projects such as monitoring of sounds. For example you can take an ordinary household portable radio and tune it to your desired FM frequency, then tune the microphone to the same frequency and place the microphone in a location around the home such as in your new born baby’s
