Si4732 + Si5351+ STM32F103C8T6 All-Mode Receiver by lz1ppl. The Si5351 is used as a local oscillator to create IF frequency of 10.7MHz. The demodulation of the signals and filters is archived in the Si4732.

This project is a proof of concept for a small receiver with a big frequency range and multimode capabilities. It uses a standard heterodyne receiver design with components such as the Si5351 for VFO and ADE-1 as a mixer. The receiver has a frequency range of 100kHz to 220MHz for AM and SSB, and 100kHz to 240MHz for FM mode. While it may not have the sensitivity of professional receivers, it works well for its size.

The receiver does not currently support NBFM mode, but can be used to receive HAM repeaters. Calibration of the Si5351 is recommended for improved SSB reception. There is room for improvement in both hardware and software, and feedback is welcome. The receiver is controlled by an STM32f103 microcontroller, with settings stored in internal EEPROM. Menu options include changing frequency step, mode, bandwidth, volume, AGC, and BFO in SSB mode.

Schematic Si4735 + Si5351+ STM32F103C8T6 All-Mode Receiver

About Si5351

The Si5351 is a versatile clock generator IC developed by Silicon Labs. It has multiple outputs that can be individually programmed to generate different frequencies, making it ideal for a wide range of applications such as telecommunications, networking, and industrial control systems. The Si5351 offers low jitter and phase noise, ensuring high-performance clock signals for precision timing requirements. Its flexibility and ease of programming, along with its small form factor, make it a popular choice for designers looking to simplify clock generation in their designs. Overall, the Si5351 is a reliable and efficient solution for generating accurate clock signals in various electronic systems.

About Si4732

The Si4732 is a highly integrated, digital radio receiver IC that is designed to provide high-quality radio reception across a wide range of frequencies. This versatile chip is capable of receiving both AM and FM signals, and can even decode RDS data for FM broadcasts. With its low power consumption and compact size, the Si4732 is well-suited for use in portable consumer electronics such as smartphones, tablets, and portable radios. Its advanced features and excellent performance make it a popular choice for designers looking to incorporate radio reception capabilities into their products.

About STM32F103C8T6

The STM32F103C8T6 is a powerful microcontroller developed by STMicroelectronics. It is part of the STM32F1 series and features an ARM Cortex-M3 core running at up to 72 MHz. This microcontroller is equipped with 64 KB of Flash memory and 20 KB of SRAM, making it suitable for a wide range of applications. It also offers a variety of communication interfaces, such as SPI, I2C, and USART, as well as multiple timers and PWM channels for precise control of external devices. With its high performance and rich feature set, the STM32F103C8T6 is a popular choice for embedded system designers looking to create efficient and reliable applications.

Download files, links, and notes

• Repository for PCB files and source code
• 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 STM32F103C8T6