Audio board
About the Audio board
Audio board is an open source NXP PCB design by wyager, published on GitHub under the MIT license. It is a 2-layer board measuring 59.5 × 19 mm, with 12 components from 10 distinct parts.
Its main chip is the Teensy4.0, from the NXP family. Other key parts include the spdif_recv, LM1117-5, S-2151 and VN7140. By type, the board carries 5 ICs, 2 connectors, 2 diodes and 1 resistor.
It belongs with the audio, displays & leds and usb & debug tools designs in this gallery.
From the project
A nixie tube audio meter
Go into code/audioboard and code/tubeboard and run cargo build --release. (Without --release, the binaries may be too large.)
Plug your AVR-ICE or similar JTAG programmer into the tube board via the programming header and run ./program.sh.
Plug in your teensy over USB, put it in programming mode, and run ./program.sh
Get KiCad and open the schematics. How to export the schematics depends on your choice of PCB manufacturer. They should have instructions available online.
Main components on the Audio board
Audio board bill of materials (BOM)
12 components, 10 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Teensy4.0 | Teensy40 | U1 |
| 1 | spdif_recv | Cliff_ORJ-8 | U2 |
| 1 | LM1117-5 | SOT-223-3_TabPin2 | U3 |
| 1 | S-2151 | S-2151 | U5 |
| 1 | VN7140 | SO-8_3.9x4.9mm_P1.27mm | U6 |
| 1 | Conn_01x04 | PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | Conn_Coaxial_Power | BarrelJack_CUI_PJ-102AH_Horizontal | J4 |
| 2 | 10u | C_1206_3216Metric | C_pwr1, C_pwr2 |
| 2 | BZX384-xxx | D_SOD-323 | D1, D2 |
| 1 | 1k | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1 |
Audio board design files
The KiCad project lives in the wyager/vumeter 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 Teensy4.0, from the NXP family.
How big is the Audio board?
The Audio board measures 59.5 × 19 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Audio board?
12 components, from 10 distinct parts. The full bill of materials is listed on this page.
Where can I download the Audio board design files?
From the wyager/vumeter 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?
Yes, under the terms of its MIT license, which wyager chose for the repository.
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.
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