FM transmitter is a low power transmitter and it uses FM waves for transmitting the sound.
FM transmitter circuit can produce the radio frequency waves which are transmitted through the antenna. a microphone is used as a source of an audio signal.
The circuit is powered by a 3 to 6V battery, specifically a 3.7V 150mAh EH 302030 lithium-ion battery.
The audio input is captured by a microphone, which feeds into a 1nF capacitor and a 4.7kΩ resistor, forming part of the input stage to condition the audio signal.
The core of the transmitter is the 2N2222A transistor, which amplifies the audio signal and modulates it onto a carrier frequency determined by the 0.1µH inductor and the 6.8pF and 47pF capacitors, creating the FM signal.
This signal is then transmitted via an antenna. The 100Ω resistor helps stabilize the circuit, while the capacitors manage the frequency tuning and signal coupling.
This type of FM transmitter is commonly used for short-range applications, such as broadcasting audio to nearby FM radios, wireless microphone systems, or DIY audio projects, making it a popular choice for hobbyists and educational purposes due to its simplicity and low cost.
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