Audio board
About the Audio board
Audio board is an open source NXP PCB design by FOSDEM, published on GitHub. It is a 4-layer board measuring 152 × 61.5 mm, with 176 components from 50 distinct parts.
Its main chip is the 2x PinSocket_1x24, from the NXP family. Other key parts include the LP5907MFX-3.3, LM5158QRTERQ1, TAD5242IRGER, TAA3040IRTWR and LMK1C1103APWR. By type, the board carries 72 resistors, 62 capacitors, 11 inductors, 9 connectors, 8 ICs and 7 transistors.
It belongs with the audio designs in this gallery.
From the project
Based on the Teensy 4.1 as audio DSP Stereo audio input and output over USB Four input channels 3 balanced XLR inputs for line level signals One stereo 3.5mm jack with mono summing Four output channels Two balanced XLR outputs Two outputs used as stereo headphones output
Main components on the Audio board
Audio board bill of materials (BOM)
176 components, 50 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 2x PinSocket_1x24 Teensy 4.1 | Teensy41 | U1 |
| 1 | LP5907MFX-3.3 | SOT-23-5 | U2 |
| 1 | LM5158QRTERQ1 LM5158 | WQFN-16-1EP_3x3mm_P0.5mm_EP1.68x1.68mm_ThermalVias | U3 |
| 2 | TAD5242IRGER TAD5242 | Texas_RGE0024R_VQFN-24-1EP_4x4mm_P0.5mm_EP2.1x2.1mm | U4, U5 |
| 1 | TAA3040IRTWR TAA3040 | WQFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U6 |
| 2 | LMK1C1103APWR LMK1C1103A | TSSOP-8_4.4x3mm_P0.65mm_bridges | U7, U8 |
| 1 | BC817-40 S8050 | SOT-23 | Q1 |
| 3 | 2N7002 | SOT-23 | Q2, Q4, Q6 |
| 3 | SI2309CDS-T1-GE3 | SOT-23 | Q3, Q5, Q7 |
| 1 | Header_02x07 Conn_02x07_Odd_Even | PinHeader_2x07_P2.54mm_Vertical | J1 |
| 1 | 640456-8 MTA100_08 | mta100_01x8_P2.54_647050-8 | J2 |
| 2 | NC3MAH | Jack_XLR_Neutrik_NC3MAH_Horizontal | J3, J5 |
| 2 | 490-SJ1-3533NG AudioJack3 | Jack_3.5mm_CUI_SJ1-3533NG_Horizontal_CircularHoles | J4, J9 |
| 3 | NC3FAH1 | Jack_XLR_Neutrik_NC3FAH2-LR-DAE_Horizontal | J6, J7, J8 |
| 1 | B0540W Schottky | D_SOD-123 | D1 |
| 1 | PTVS5V0S1UR,115 | Nexperia_CFP3_SOD-123W | D2 |
| 1 | SS210 | D_SMB | D3 |
| 4 | PRTR5V0U2X,215 PRTR5V0U2X | SOT-143 | D4, D5, D6, D7 |
| 1 | BLM21AG102SN1D FerriteBead_Small | L_0805_2012Metric | FB1 |
| 2 | BLM21AG601SN1D 600@100Mhz | L_0805_2012Metric | L1, L3 |
Show 30 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 744031004 4.7uH | L_Wuerth_WE-TPC-3816 | L2 |
| 7 | LQM21FN100N00L 10μH 15mA | L_0805_2012Metric | L4, L5, L6, L7, L8, L9, L10 |
| 19 | C 1μF 16V 0805 1μF | C_0805_2012Metric | C1, C3, C5, C6, C9, C17, C18, C20 +11 |
| 1 | C 22μF 16V 0805 22μF | C_0805_2012Metric | C2 |
| 1 | C 47μF 16V P2 47μF | CP_Radial_D5.0mm_P2.00mm | C4 |
| 7 | C 10μF 16V 0805 10μF | C_0805_2012Metric | C7, C16, C21, C23, C28, C31, C38 |
| 9 | C 100nF 16V 0805 100nF | C_0805_2012Metric | C8, C11, C13, C19, C26, C32, C34, C35 +1 |
| 1 | C 22nF 16V 0805 22nF | C_0805_2012Metric | C10 |
| 1 | C 33nF 16V 0805 33nF | C_0805_2012Metric | C12 |
| 1 | C 330pF 16V 0805 330pF | C_0805_2012Metric | C14 |
| 1 | C 4.7μF 16V 0805 4.7uF | C_0805_2012Metric | C15 |
| 7 | C 1nF Audio 100V 0805 1nF 100V | C_0805_2012Metric | C39, C40, C45, C46, C51, C52, C60 |
| 3 | C 10μF 100V P2 10μF 100V | CP_Radial_D5.0mm_P2.00mm | C41, C47, C53 |
| 3 | C 2.2nF Audio 100V 0805 2.2nF 100V | C_0805_2012Metric | C42, C48, C54 |
| 8 | C 10μF Audio 100V P2 10μF 100V | CP_Radial_D5.0mm_P2.00mm | C43, C44, C49, C50, C55, C56, C61, C62 |
| 4 | R 1kΩ 125mW 1% 0805 1kΩ | R_0805_2012Metric | R1, R2, R12, R13 |
| 17 | R 47Ω 125mW 1% 0805 47Ω | R_0805_2012Metric | R3, R4, R5, R6, R7, R8, R9, R10 +9 |
| 2 | R 0Ω 125mW 1% 0805 0Ω | R_0805_2012Metric | R16, R17 |
| 1 | R 510Ω 125mW 1% 0805 510Ω | R_0805_2012Metric | R18 |
| 4 | R 22kΩ 125mW 1% 0805 22kΩ | R_0805_2012Metric | R19, R26, R38, R50 |
| 8 | R 100kΩ 125mW 1% 0805 100kΩ | R_0805_2012Metric | R20, R21, R27, R33, R39, R45, R51, R57 |
| 1 | R 3.9kΩ 125mW 1% 0805 3.9kΩ | R_0805_2012Metric | R22 |
| 1 | R 2.2kΩ 125mW 1% 0805 2.2kΩ | R_0805_2012Metric | R23 |
| 1 | R 1.5kΩ 125mW 1% 0805 1.5kΩ | R_0805_2012Metric | R24 |
| 7 | R 10kΩ 125mW 1% 0805 10kΩ | R_0805_2012Metric | R25, R37, R49, R61, R62, R69, R70 |
| 6 | R 6.8kΩ 125mW 1% 0805 6.8kΩ | R_0805_2012Metric | R28, R30, R40, R42, R52, R54 |
| 3 | R 470Ω 125mW 1% 0805 470Ω | R_0805_2012Metric | R29, R41, R53 |
| 6 | R 10Ω 125mW 1% 0805 10Ω | R_0805_2012Metric | R31, R32, R43, R44, R55, R56 |
| 3 | R 13kΩ 125mW 1% 0805 13kΩ | R_0805_2012Metric | R34, R46, R58 |
| 8 | R 1MΩ 125mW 1% 0805 1MΩ | R_0805_2012Metric | R35, R36, R47, R48, R59, R60, R71, R72 |
Audio board design files
The KiCad project lives in the FOSDEM/video repository on GitHub; these links point at the commit this page was built from.
Audio board: common questions
What microcontroller does the Audio board use?
The Audio board is built around the 2x PinSocket_1x24, from the NXP family.
How big is the Audio board?
The Audio board measures 152 × 61.5 mm, has 4 copper layers and is 1.592 mm thick.
How many components are on the Audio board?
176 components, from 50 distinct parts. The full bill of materials is listed on this page.
Where can I download the Audio board design files?
From the FOSDEM/video repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Audio board design in my own project?
The repository has no license, so all rights stay with FOSDEM. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Audio board without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.
More boards in video
RP2040/RP2350Fosdem dual capture
87.9 × 95.8 mm211 parts4LNo license114
Power board
109.5 × 76 mm150 parts2LNo license114
Mv2 taa3040
108.5 × 53 mm113 parts4LNo license114
Switch board
84 × 83 mm97 parts4LNo license114
NXPMv2 base
69 × 64 mm73 parts4LNo license114
Adapter spdif
44 × 33 mm11 parts2LNo license114
Display hat
31 × 65 mm9 parts2LNo license114
Radxa hat
65 × 20.4 mm8 parts2LNo license114
Similar boards
NXP32Bit shift register
MaltWhiskey
100 × 54 mm56 parts4LNo license763
NXPMega-Cube-Board
200 × 54 mm100 parts4LNo license763
NXPMCL64
MicroCoreLabs
39.3 × 61.8 mm9 parts4LNo license532
NXPROM Emulator
21.5 × 37.1 mm5 parts2LNo license532
NXPMCLZ8
37.1 × 61.5 mm6 parts4LNo license532
NXPXTMAX
81 × 46 mm14 parts4LNo license532