Adafruit
Adafruit Stereo FM Transmitter with RDS/RBDS Breakout - Si4713
Best DIY solution for hobbyists broadcasting custom audio to FM receivers.
Broadcast your own radio station with this all-in-one stereo FM transmitter breakout board, powered by the Si4713 chip. Easily connect it to your favorite microcontroller, like an Arduino, to set your desired transmit frequency and send line-level audio through the stereo headphone jack. Enjoy your broadcast on any FM receiver, from car radios to pocket devices, with a range of up to 10 meters. This transmitter also supports RDS/RBDS data, allowing you to display custom text and station identifiers on compatible receivers. Get started quickly with the included Arduino library, example code, and tutorial.
$19.95
Owner Satisfaction
4.5
/ 5
Category Rank
1
/ 45
Best FM Transmitters
Price vs Category Average
-35%
Below average
Dimensions w/ Components
41197
/ mm x mm x mm
Who it's for
- Makers wanting to display song titles on car radios
- Audiophiles seeking clear, low-noise wireless audio transmission
- Developers needing simple integration with Arduino or Raspberry Pi
Who should skip it
- Budget-conscious hobbyists needing basic, low-cost modules
- Users requiring long-range broadcasting capabilities
- Beginners looking for a simple plug-and-play solution
Performance breakdown
Signal Range
Ten-meter reach is perfect for personal broadcasting within a single room.
Integration Ease
Arduino library and example code make setup a seamless, plug-and-play experience.
RDS Functionality
Advanced text and station identification features add a professional, polished touch.
Build Compactness
Ultra-lightweight design fits effortlessly onto any standard breadboard for prototyping.
Audio Fidelity
Delivers clear stereo sound suitable for hobbyist radio and experimental projects.
Hardware Versatility
Flexible voltage range supports a wide variety of microcontroller power configurations.
Key Specs
Dimensions w/ Components
41mm x 19mm x 7mm
PCB Dimensions
38mm x 19mm x 2mm
Weight
3.2g
Operating Supply Voltage
3 V to 5 V
Frequency
102.3 MHz
Brand
Adafruit
Physical Interface Ports
JST Connector
Operating Voltage
3.5 Volts
Features
- Stereo FM transmitter with RDS/RBDS support
- Broadcast audio up to 10 meters
- Integrates easily with microcontrollers
- Includes Arduino library and example code
- Stereo headphone jack for audio input
- Customizable text and station identifiers
- Powered by Si4713 chipset
- Breadboard friendly design
What customers say
This FM transmitter earns high praise, especially for its robust feature set, notably the inclusion of RDS RBDS capabilities for advanced data transmission. Users consistently commend the excellent documentation and reliable, easy to use libraries that simplify integration with microcontrollers like Arduino. The quality of the transmitted stereo audio is frequently noted as surprisingly clear and stable for a low power device. While achieving maximum range requires careful antenna tuning, the overall consensus is that this module offers exceptional functionality and quality. It is a highly valued component for specialized, short range FM broadcasting projects, providing great value for its capabilities.
Know before you buy
The Si4713 transmitter has a broadcast range of approximately 10 meters. This is ideal for personal use, such as playing audio through a car radio or a nearby home stereo system.
While the board is designed for easy integration with Arduino using the provided library, it communicates via I2C. This means it can be used with other microcontrollers like Raspberry Pi or ESP32, provided you write or port the necessary drivers.
RDS/RBDS support enables you to broadcast digital data alongside your audio signal. This allows compatible FM receivers to display custom text, such as your station name, song titles, or artist information.
The board uses the audio input cable as an antenna. For the best signal quality and range, ensure your audio cable is connected and kept straight.
Low-power FM transmission is subject to local regulations, which vary significantly by country. Always check your local laws regarding unlicensed radio broadcasting before operating the device.
The board features a standard stereo headphone jack for line-level audio input. You can connect devices like smartphones, MP3 players, or computers directly to the transmitter.
Still have a question?
Ask Hayley anything about this product before you decide.