MP3-Player
About the MP3-Player PCB
MP3-Player is an open source STM32 PCB design by nicholasshort, published on GitHub. It is a 4-layer board measuring 50 × 50 mm, with 109 components from 38 distinct parts.
Its main chip is the C2054095, from the STM32 family. Other key parts include the C473366, C7519, C2862740, C124691 and C42414591. By type, the board carries 44 capacitors, 36 resistors, 8 ICs, 5 transistors, 4 connectors and 4 switches.
It belongs with the audio and power & battery designs in this gallery.
From the project
This is a simple MP3 player designed to be small, lightweight, and long-lasting. The goal is something I can bring on runs, hikes, or long trips that provides 24+ hours of music on a single charge with wired headphones. Firmware is currently in the works, with low level hardware
This is a simple MP3 player designed to be small, lightweight, and long-lasting. The goal is something I can bring on runs, hikes, or long trips that provides 24+ hours of music on a single charge with wired headphones. Firmware is currently in the works, with low level hardware drivers completed.
- MCU: STM32F411CEU6 (Cortex-M4F @ 100 MHz, USB OTG FS) - DAC: TI TAD5242 stereo DAC over I²S, 3.5 mm headphone jack - Storage: microSD card (SPI) - Power: USB-C input, TI BQ24259 Li-ion charger, dual TPS7A20 LDOs for analog/digital rails - Controls: 4 tactile switches (PWR, MENU, PLAY, NEXT), 2 ×…
Main components on the MP3-Player
MP3-Player bill of materials (BOM)
109 components, 38 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | C2054095 STM32F411CEUx | QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm | U101 |
| 1 | C473366 BQ24259 | VQFN-24-1EP_4x4mm_P0.5mm_EP2.5x2.5mm | U201 |
| 1 | C7519 USBLC6-2SC6 | SOT-23-6 | U202 |
| 2 | C2862740 TPS7A2033PDBVR | SOT-23-5 | U203, U204 |
| 2 | C124691 TPD4E1U06 | SOT-23-6 | U301, U403 |
| 1 | C42414591 TAD5242 | TAD5242 | U401 |
| 3 | C15127 AO3401A | SOT-23 | Q301, Q303, Q304 |
| 2 | C3290631 2N7002H | SOT-23 | Q302, Q305 |
| 1 | C518154 8MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y101 |
| 1 | C505099 Conn_01x02_Socket | Molex_PicoBlade_53048-0210_1x02_P1.25mm_Horizontal | J201 |
| 1 | C165948 USB_C_Receptacle_USB2.0_16P | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J202 |
| 1 | C113206 Micro_SD_Card_Det1 | TF-015 | J301 |
| 1 | C18594 PJ-320B | PJ-320B | J402 |
| 4 | C7470162 ZX-QC66-10.0TP | ZX-QC66 | SW301, SW302, SW303, SW304 |
| 1 | C700814 NTC | R_0603_1608Metric | TH201 |
| 1 | C74338 GREEN | LED_0402_1005Metric | D101 |
| 1 | C131223 BLUE | LED_0402_1005Metric | D102 |
| 2 | C965555 WS2812B-2020 | LED_WS2812B-2020_PLCC4_2.0x2.0mm | D301, D302 |
| 1 | C5671 120R | L_0805_2012Metric | FB201 |
| 1 | C43388 1u | L_Sunlord_SWPA3015S | L201 |
Show 18 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | C1705 4.7u | C_0603_1608Metric | C101, C115 |
| 18 | C1525 100n | C_0402_1005Metric | C102, C103, C104, C105, C106, C107, C108, C109 +10 |
| 2 | C162202 10p | C_0603_1608Metric | C113, C114 |
| 12 | C19702 10u | C_0603_1608Metric | C203, C209, C211, C212, C213, C301, C304, C305 +4 |
| 1 | C82219 47n | C_0402_1005Metric | C204 |
| 9 | C15850 10u | C_0805_2012Metric | C205, C206, C207, C208, C210, C214, C215, C216 +1 |
| 3 | C25744 10k | R_0402_1005Metric | R101, R211, R212 |
| 2 | C15402 0R | R_0603_1608Metric | R102, R201 |
| 2 | C11702 1k | R_0402_1005Metric | R103, R104 |
| 6 | C25546 220k | R_0402_1005Metric | R202, R203, R204, R309, R313, R314 |
| 2 | C25905 5.1k | R_0402_1005Metric | R205, R206 |
| 1 | C25907 5.23k | R_0402_1005Metric | R207 |
| 1 | C247119 316R | R_0402_1005Metric | R208 |
| 13 | C25796 56k | R_0402_1005Metric | R209, R210, R213, R215, R301, R302, R303, R304 +5 |
| 1 | C25741 100k | R_0402_1005Metric | R214 |
| 1 | C25764 200k | R_0402_1005Metric | R216 |
| 1 | C11463 31.6k | R_0402_1005Metric | R217 |
| 3 | C17168 0R | R_0402_1005Metric | R305, R306, R307 |
MP3-Player design files
The KiCad project lives in the nicholasshort/MP3-Player repository on GitHub; these links point at the commit this page was built from.
MP3-Player: common questions
What microcontroller does the MP3-Player use?
The MP3-Player is built around the C2054095, from the STM32 family.
How big is the MP3-Player PCB?
The MP3-Player measures 50 × 50 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the MP3-Player?
109 components, from 38 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the MP3-Player design files?
From the nicholasshort/MP3-Player repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the MP3-Player design in my own project?
The repository has no license, so all rights stay with nicholasshort. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the MP3-Player 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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