HardLabs

Audio shield

deniskokarev·audio_shield

Audio shield layout, top view — open source AVR/Arduino board by deniskokarev

About the Audio shield

Audio shield is an open source AVR/Arduino PCB design by deniskokarev, published on GitHub. It is a 2-layer board measuring 52.1 × 54.6 mm, with 11 components from 10 distinct parts.

Its main chip is the Arduino_UNO_R3_Shield, from the AVR/Arduino family. Other key parts include the LM386 and OPA340NA. By type, the board carries 4 capacitors, 3 resistors, 2 ICs, 1 module and 1 connector.

It belongs with the audio and dev boards & breakouts designs in this gallery.

From the project

KiCad project for Arduino compatible audio amplifier shield

Exercises all stages or product prototyping: - schematics - SPICE simulation from CSV input into CSV (or WAV) - schematics -> PCB

firmware: - Zephyr POSIX DAC driver to capture DAC output stream into CSV - Zephyr main that generates sound - we can add virtual BLE capabilities with Aroid running in QEMU using Bumble

A compact, Arduino Uno R3-form-factor audio shield that amplifies the analog output of an MCU DAC. The board is designed around the STM32 NUCLEO-L476RG, using its A2 header pin (PA4, DAC channel 1) as the audio source.

Main components on the Audio shield

LM386OPA340NAArduino_UNO_R3_Shield

Audio shield bill of materials (BOM)

11 components, 10 distinct parts.

QtyPartRefs
1
LM386
U1
1
OPA340NA
U3
1
Arduino_UNO_R3_Shield
A1
1
AudioJack2
J1
2
10u
C1, C3
1
.05u
C2
1
1u
C4
1
30k
R1
1
1k
R2
1
10
R3

Audio shield design files

The KiCad project lives in the deniskokarev/audio_shield repository on GitHub; these links point at the commit this page was built from.

Audio shield: common questions

What microcontroller does the Audio shield use?

The Audio shield is built around the Arduino_UNO_R3_Shield, from the AVR/Arduino family.

How big is the Audio shield?

The Audio shield measures 52.1 × 54.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Audio shield?

11 components, from 10 distinct parts. The full bill of materials is listed on this page.

Where can I download the Audio shield design files?

From the deniskokarev/audio_shield 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 shield design in my own project?

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

Can I test firmware for the Audio shield without the hardware?

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

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