TEA5767-based Radio Tuner

TEA5767-based Radio Tuner
This project showcases an ESP32-based FM radio, leveraging the TEA5767 tuner paired with a KY-040 rotary encoder, a PAM8403 audio amplifier, and a compact 0.96” OLED display. A custom PCB design enhances the functionality while maintaining a simplified structure for reproducibility.

Project History

Initially developed as a prototype using an Arduino UNO in January 2026, this project has evolved into a more refined PCB design phase. The documented progress in this repository will provide insights into the development of the PCB design.

The prototype's features include:

• Manual and preset FM tuning
• Frequency display on a 16x2 LCD
• Wired headphone audio output

The TEA5767 module, which does not integrate a speaker amplifier, necessitated direct soldering onto the module for audio output. Illustrations of the prototype circuit and circuit diagrams can be viewed in the following figures:

Figure 1: Prototype using Arduino UNO

Figure 2: Circuit Diagram of the prototype

For a video demonstration of the prototype, please visit this link. A detailed breakdown of the project theory, component selection, and circuit design is available in the PDF file.

Transition to PCB Design

In transitioning to the PCB design, improvements have been incorporated:

• PAM8403 amplifier for audio output to 3-watt speakers, enhancing volume control
• ESP32 Development Board substituting the Arduino UNO to save space
• 0.96” OLED display replacing the 16x2 liquid crystal display
• KY-040 rotary encoder for frequency control

A critical design consideration involved powering the TEA5767 module. Although it operates on 5V, it’s ideally powered at 3.3V to safeguard the ESP32 microcontroller's data pins from potential damage.

The PAM8403 amplifier requires a separate power source since the total current demand can exceed the ESP32’s rated limits. Thus, both the amplifier and microcontroller are configured in parallel to a 5V transformer with a capacity over 1.5A to ensure reliability during operation.

The schematic design was created in KiCad's schematic editor:
Figure 3: Schematic of the ESP32-based Circuit

Custom footprint designs for various components were generated to accommodate unique module specifications, with photo documentation included.

PCB Layout
The PCB layout, crafted in KiCad, reflects the final design considerations:
Figure 9: PCB Layout of the Radio Module

The project utilizes JLC PCB for manufacturing. Detailed awareness of manufacturing capabilities ensures the generated Gerber files meet necessary specifications. All files for fabrication can be found in the gerbers folder.

For information on the written code utilized throughout the project, refer to the code file.

Images of the final PCB, including both its front and backside, are available:
Figure 10: Front face of the PCB

Figure 11: Backside of the PCB

Additionally, an image showcasing the completed ESP32-based radio module can be viewed here:
Figure 12: ESP32-based Radio Module using TEA5767

For a demonstration of the PCB and radio device, view this video.

Designing this PCB has presented a valuable learning opportunity, enriching understanding in electronics and hardware design. This repository aims to assist individuals embarking on similar projects or initiating their own PCB design explorations.