Frequency Modulation (FM) transmitters are foundational to modern wireless communication, enabling high-fidelity audio broadcasting and reliable data transmission. Developed by Edwin H. Armstrong in 1933, FM modulates information by varying the frequency of a carrier wave, offering superior noise immunity compared to Amplitude Modulation (AM). FM is widely used in commercial radio, aviation communications, and emergency services thanks to its robustness in noisy environments.
For the build itself: it captures audio with a microphone and transmits it wirelessly over FM — a compact, low-power circuit that pairs well with any standard FM receiver.