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Fm radio

snakeye·fm-radio·hardware/fm-radio.kicad_pcb

Fm radio PCB layout, top view — open source STM32 board by snakeye

About the Fm radio PCB

Fm radio is an open source STM32 PCB design by snakeye, published on GitHub. It is a 4-layer board measuring 60 × 17 mm, with 41 components from 25 distinct parts.

Its main chip is the STM32F103CBT6, from the STM32 family. Other key parts include the LTC4054ES5-4.2, AP2112K-3.3 and RDA5807M. By type, the board carries 12 capacitors, 11 resistors, 5 connectors, 4 ICs, 2 transistors and 2 fuses.

It belongs with the rf & radio, displays & leds and audio designs in this gallery.

From the project

A DIY portable FM radio built around STM32F103 and RDA5807

A DIY portable FM radio built around STM32F103 and RDA5807.

This project started as a "build something useful and learn something new" challenge. It became my first serious STM32 build, with custom hardware, multiple PCB revisions, and firmware focused on reliability on real battery-powered hardware.

- I had several STM32 boards and programmers for years but never finished a real project with them. - The Arduino framework on STM32 made startup and low-level bring-up much easier than my previous attempts. - The first prototype used a TEA5767 module, but station lock was unstable and…

Fm radio, from the project README
From the project README

Main components on the Fm radio

LTC4054ES5-4.2AP2112K-3.3RDA5807MSTM32F103CBT6

Fm radio bill of materials (BOM)

41 components, 25 distinct parts.

QtyPartRefs
1
LTC4054ES5-4.2
U1
1
AP2112K-3.3
U2
1
RDA5807M
U3
1
STM32F103CBT6
U5
1
IRLML6402
Q1
1
IRLML2060
Q2
1
32768Hz
Y1
1
USB C
J1
1
AudioJack4
J2
1
Prog
J3
1
OLED
J4
1
Bat
J5
2
~
F1, F2
1
~
SW1
1
Power
SW2
1
WS2812B-2020
D1
1
270mH
L1
1
100pF
C1
1
22uF
C4
7
1u
C5, C11, C12, C14, C15, C16, C17
Show 5 more
QtyPartRefs
3
100uF
C6, C7, C8
2
5.1k
R2, R3
1
15k
R4
5
10k
R5, R6, R7, R9, R12
3
100k
R8, R10, R11

Fm radio design files

The KiCad project lives in the snakeye/fm-radio repository on GitHub; these links point at the commit this page was built from.

Fm radio: common questions

What microcontroller does the Fm radio use?

The Fm radio is built around the STM32F103CBT6, from the STM32 family.

How big is the Fm radio PCB?

The Fm radio measures 60 × 17 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Fm radio?

41 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Fm radio design files?

From the snakeye/fm-radio repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Fm radio design in my own project?

The repository has no license, so all rights stay with snakeye. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Fm radio without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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