SI4732 si4735 radio pro mini all band radio receiver FM MW SW Air Band. Upgrade your radio experience with the new version of the SI4732 SI4735 radio pro mini receiver! Experience improved functionality and performance with the latest firmware updates and open-source content. Don’t miss out on the optimized standby power and FM headphone antenna features. Get your hands on the new version files and enhance your listening experience today. Take advantage of the easy station tuning and frequency adjustment modes for seamless operation. Upgrade now and enjoy the ultimate radio experience!

Schematic SI4732 si4735 radio pro mini radio receiver

Based on the Elf Ball version (V3), a revision was made again. Compared with the previous Elf Ball version, the version differences include:

1. Merge the main board and expansion board, and modify the PCB to a 4-layer structure.
2. Package adjustment: some capacitor resistor components are changed from 0603 to 0402, there is a high risk of beginner flipping, please be careful when hand soldering.
3. The MCU is changed from ESP32S3 module to ESP32 chip and other chips.
4. The radio chip uses two versions of SI4732 and SI4735.
5. A complete digital audio solution is used, the 4732 version cannot support analog and digital audio signal output at the same time due to the lack of pins, so the single sideband function is removed, and FM/AM/AIR is retained.
6. Added Bias-T support.
7. Replace the magnetic rod coil with an external antenna using an SMA socket.
8. Band pass filtering circuit and frequency selection circuit (electronic switch is recommended to choose PE4283).
9. Reduce signal interference and find a way to save power.

Add open source content list:

• Mini radio schematic and PCB (4-layer structure)
• Radio new version firmware function description
• Active FM loop antenna schematic & PCB; When replicating, please do not remove the “designed by hdfy”
• Label Radio shell & panel design files, by cr@ Sandy Link: https://pan.baidu.com/s/1JsxtqkOMRJWLDvcYEdlYgw?pwd=x3k8
• All new open-source files contain the keyword [V4], please pay attention to differentiate them from historical open-source files
• Before purchasing the screws and batteries needed for the shell, please carefully read the instructions in the shell design document.

Latest version files: ESP32_Radio_mini_SI4735_V4_2.4_0908, ESP32_Radio_mini_SI4732_V4_2.4_0908
– Standby power optimization
– FM headphone antenna optimization.

New firmware available for the addition – FW_ESP32S3_Radio_v231004.bin, please download in the attachment.

Buttons from left to right on the top row:
1. LIVE mode
2. UP
3. DOWN
4. Theme switch
Buttons from left to right on the bottom row:
5. Clock mode
6. MODE mode
7. SEEK mode
8. FREQ mode

Common operations:

1. Station tuning mode: The screen displays “LIVE” in the middle, and supports saving up to 20 fixed frequencies for easy listening at any time;
   1. Volume adjustment — In LIVE mode, rotate the encoder left and right to adjust the volume level; short press the encoder, mute on/off;
   2. Switch to listen to saved channels — In LIVE mode, short press button 2 to switch to the previous saved channel; short press button 3 to switch to the next saved channel;
   3. In LIVE mode, long press button 2 to turn on/off AGC.
2. Frequency tuning mode: The screen displays “FREQ/SEEK/MODE” in the middle, supports manual/auto search for stations/switch modulation mode (AM/FM/AIR)
   1. Manual tuning — Short press button 7 to enter SEEK mode, rotate the encoder left and right to automatically search for stations;
   2. Auto tuning — Short press button 8, in FREQ mode, and rotate the encoder left and right to switch the tuning direction;
   3. Save the manually/auto-tuned channels to the station tuning mode for easy listening next time – In FREQ/SEEK mode, long press button 3 to add a new channel; short press button 2/3 to switch to the new/old channel you want to save frequency; long press button 2 to automatically save the found frequency to the current channel;
   4. Switch modulation mode (AM/FM/AIR) — Short press button 6 to switch to MODE mode, long press button 2/3 to switch to the previous/next modulation mode; When MODE displays as AM, short press button 2/3 to switch to the previous/next AM band (MW1/MW2, SW1/SW2, etc.)
   5. Return to station tuning mode, adjust volume, or listen to saved channels—Short press button 1 to return to LIVE mode;

Bandwidth/BFO control is not supported at the moment.

Bom SI4732 si4735 radio pro mini radio receiver

Download files and info

Download PCB in Gerber + esp32 Firmware

Download Gerber

Download ESP32S3 Firmware

Download 3D housing

Files you will use

• FW_ESP32S3_Radio_v231004.bin — Firmware for ESP32
• Gerber_ESP32_Radio_Pro_Pcb_1.zip — Gerber for SI4732
• Gerber_ESP32_Radio_Pro_Pcb.zip — Gerber for Si4735
• 外壳3D打印文件V4bySandy — 3D case

Buy components for this project

• Buy Display 1.47LCD-IPS-172*320
• Buy SI4735 IC SI4735-D60-GU SSOP-24 si4735 4735d60gu
• Buy SI4732 SI4732-A10-GSR SI47 SI4732 SI4732-A SI4732-A10 SI4732-A10-G SI4732-A10-GS
• Buy ESP32-D0WDQ6-V3
• Buy NE602 SA602

Source: https://oshwhub.com/chimchim4482/GNR001