DIY Digital FM Radio Soldering Kit

Product Features

Voltage Regulation Circuit: Incorporates a 3.3V buck-boost module to maintain stable voltage supply to the microcontroller and digital display. The system remains functional with input voltage as low as 2.5V.

Audio Amplification: Uses an AXS2031 digital amplifier chip to deliver up to 5W of monaural audio output, designed to reduce distortion at varying voltage levels.

Signal Reception Design: Includes a 30cm telescopic omnidirectional antenna and integrated spiral copper PCB traces to improve FM signal sensitivity across the 87.5‑108MHz band.

Microcontroller Unit: Based on an STC15W408AS MCU with power-off memory function, which retains the last tuned frequency when restarted.

Enclosure Options: Available with a transparent acrylic housing, precision-cut and assembled using copper standoffs, or as a kit without housing.

Specifications

Model Options: Kit Only (No Housing), Kit + Housing, Fully Assembled Unit

Dimensions: 158 × 28 × 74mm

Housing Material: Acrylic with copper standoffs

Operating Current: 10mA

Power Input: 2 × AA batteries or 5V/1‑2A USB power source (use one at a time)

FM Frequency Range: 87.5‑108MHz

Amplifier Chip: AXS2031

Audio Output: 5W monaural

Antenna: 30cm telescopic

Contents: 1 × DIY Digital FM Radio Soldering Kit (components and PCB)

Assembly Instructions

1. Secure the antenna vertically with screws and solder to the PCB.
2. After completing PCB soldering, attach the front and rear hex standoffs.
3. Install the front, side, and rear acrylic panels in order, then tighten all screws.

Notes

• This is a DIY soldering kit; soldering tools and equipment are not included.
• Only one power source (batteries or USB) should be connected at a time to prevent circuit damage.
• An electronic assembly guide is provided with the kit.