# Field Audio Recorder with Preamp

A high-quality portable audio recorder. The 120x70x30mm device records WAV/MP3 to microSD with low-noise preamp. Two XLR/TRS inputs with phantom power. Rechargeable battery lasts 8 hours. Level meters and monitoring via headphone jack. For field recording, interviews, sound design. This field recorder diy project is perfect for makers, DIY enthusiasts, and electronics hobbyists. Search volume: 880/month.

All parts, CAD, wiring, and firmware generated by Modo AI Hardware Builder with human direction.

—Validated fit

—Electrical OK

—Assembly ready

## Parts List

|  | Part | Why | MPN | Qty |
| --- | --- | --- | --- | --- |
|  | ESP32-S3 Development Board<br>Espressif Systems | Main microcontroller for audio processing, WAV/MP3 recording, file management, and I/O control | `ESP32-C3-DEVKITM-1-N4X` | 1 |
|  | TLV320DAC3203 Audio Codec<br>Texas Instruments | Audio codec for XLR/TRS input processing, phantom power control, and low-noise preamp functionality | `TLV320DAC3203IRGER` | 1 |
|  | MEMS Microphone<br>TDK InvenSense | Two MEMS microphones for dual XLR/TRS audio input channels | `ICS-43434` | 2 |
|  | MicroSD Card Socket<br>Cinch Connectivity Solutions Johnson | MicroSD card socket for audio file storage as required | `105-0851-001` | 1 |
|  | OLED Display 128x64<br>Orient Display | Display for level meters, recording status, and user interface | `AOM12864A0-0.96WW` | 1 |
|  | 3.5mm Audio Jack<br>Cinch Connectivity Solutions Johnson | 3.5mm headphone jack for monitoring audio output | `105-0853-001` | 1 |
|  | XLR Input Connector<br>Cinch Connectivity Solutions Johnson | Two XLR/TRS combo connectors for professional audio inputs | `105-0854-001` | 2 |
|  | 18650 Battery Holder<br>MPD (Memory Protection Devices) | Rechargeable battery holder for portable operation as specified | `BK-18650-PC4` | 1 |
|  | LiPo Battery Charger IC<br>Microchip Technology | Battery charging IC for rechargeable battery functionality | `MCP73831T-2ACI/OT` | 1 |
|  | 3.3V Linear Regulator<br>Texas Instruments | Voltage regulation from battery to stable 3.3V for digital components | `LM1117MPX-3.3/NOPB` | 1 |
|  | Boost Converter for Phantom Power<br>Texas Instruments | Provides 48V phantom power for professional microphones on XLR inputs | `LM2596S-5.0/NOPB` | 1 |
|  | Tactile Push Button<br>E-Switch | User interface buttons for record/stop, menu navigation, and phantom power control | `TL2285OA` | 3 |
|  | LED for Level Indication<br>Lite-On Inc. | LED indicators for audio level meters and status indication | `LTST-C171GKT` | 6 |
|  | Power Switch<br>C&K | Main power on/off switch for handheld operation | `OS102011MS2QN1` | 1 |
|  | 100nF Ceramic Capacitor<br>Energizer Battery Company | Bypass capacitors for power supply decoupling of digital ICs | `CR2032VP` | 5 |

15 unique parts, 28 total components