Compact 2-Channel USB Audio Interface Design

₹12500-37500 INR

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Posted 4 days ago

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₹12500-37500 INR

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That's a key requirement for a consumer product. Removing the pogo pin connectors simplifies the manufacturing process and lowers your costs. Your plan to flash firmware solely through the USB-C data port via the STM32's built-in bootloader is a standard and effective strategy for a production environment. Here is the updated project brief with all your requirements. Project Brief: 2-Channel USB Audio Interface 1. Project Overview This project is for the design of a compact, 2-channel USB audio interface for musicians. The product provides professional-grade recording capabilities at an accessible price point. It will feature one XLR port and one 1/4" TRS female jack with switchable 48V phantom power on the XLR port. A dedicated USB-C power port will be next to the audio inputs, and a separate USB-C data port will be on the opposite end. 2. Technical Specifications A. Core Components: * Microcontroller: STM32F407VGT6 (100-LQFP package) * ADC: PCM1863 (30-TSSOP package) * Connectors: One PCB-mount XLR female port, one PCB-mount 1/4" TRS female jack, and two USB-C ports. B. PCB Design Specifications: * Type: 4-layer FR4 board * Dimensions: The board size will need to be re-evaluated to accommodate the side-by-side ports. A standard XLR port is approximately 30mm x 25mm, and a 1/4" jack is about 15mm wide. The enclosure's front panel will need a width of at least 100mm to 120mm to fit all the connectors with adequate spacing. The height will be at least 35mm to accommodate the XLR port. The PCB dimensions must be designed to fit this new enclosure. * Thickness: 1.6 mm * Solder Mask: Yellow * Surface Finish: Lead-Free HASL (HASL-LF) * Copper Weight: 1 oz on all layers 3. Functional Requirements * Signal Flow: * Analog Input 1: A microphone connected to the XLR port. This port should support switchable 48V phantom power. * Analog Input 2: A guitar or line-level signal connected to the 1/4" TRS female jack. * Both signals are passed through the PCM1863's integrated Programmable Gain Amplifier (PGA) for pre-amplification and digitized. * The STM32F407VGT6 processes and sends the data to a host device via the USB-C data port. * Power: * Power Logic: When the phantom power switch is OFF, both the XLR and TRS inputs must be able to operate using only the power supplied by the host device (phone/PC) via the data port. The separate power port and boost converter are only active when phantom power is switched ON. * Data Port (opposite end): This primary USB-C port will provide power for the microcontroller and ADC and will be the sole conduit for all audio data communication with the host device (smartphone/PC). * Power Port (front end): A second, dedicated USB-C port must be included to power the phantom power circuit. This port must be able to accept power from any standard mobile phone charger (typically providing 5V). * 48V Phantom Power: A boost converter circuit must be designed to step up the 5V input from the power port to the required 48V for the phantom power. Phantom power for the XLR port must be switchable via a button on the device, and the design must include a status LED to indicate when it is on. * LED Indicators: * A Power Status LED to indicate that the device is powered on by the host device via the data port. * A separate Phantom Power LED to indicate that 48V phantom power is active. * Firmware Flashing: The device must be flashable via the USB-C data port using the STM32's built-in DFU (Device Firmware Upgrade) bootloader. The design should include any necessary pull-up/pull-down resistors to enable bootloader mode via a hardware button on the device. 4. PCB Layout and Design Rules * Physical Layout: The designer must place the XLR and TRS ports side-by-side. The USB-C power port must be placed next to them. The USB-C data port must be placed on the opposite side of the PCB. This will be the main layout challenge. * High-Voltage Routing: The 48V phantom power lines must be routed carefully with proper clearance from all other traces, especially those carrying analog and digital signals. * Power Planes: The 4-layer board design is now even more critical due to the proximity of the power port to the audio inputs. The power plane must be partitioned to provide clean power to the digital and analog sections, with the 48V boost converter section physically isolated. * Grounding: A single, solid ground plane on an inner layer is mandatory to manage the high currents of the boost converter and prevent noise from contaminating the audio signal. * Partitioning: The board must be strictly partitioned into analog, digital, and high-voltage power sections. * Phantom Power Isolation: The circuit must be designed to ensure that the 48V phantom power is routed exclusively to the XLR connector and is completely isolated from the TRS connector. This can be achieved using a blocking capacitor or other circuit to prevent the high voltage from affecting the TRS input. * No Dedicated Programming Header: The board must be designed without a dedicated programming header. The bootloader functionality through the USB-C data port is the only method for flashing firmware. 5. Final Deliverables The final deliverables remain the same: complete PCB design files (Gerber files, schematic, BOM), a 3D CAD model of the final PCB, and a comprehensive design document.

Digital Signal Processing

Project ID: 39740397

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8 freelancers are bidding on average ₹25,500 INR for this job

@SMBelectronics

Hello, I’m Abbas Jawadwala, Co-founder & Lead Engineer at SMB ElectroTech. With 5+ years of experience, I’ve delivered projects across PCB design, embedded systems, and product development for clients worldwide. Our expertise includes: - PCB layouts (single to multi-layer, DFM, signal integrity) - Embedded firmware (AVR, ARM, ESP, Arduino) - Power electronics & circuit design - End-to-end prototyping & testing We focus on robust, manufacturable designs with clear communication and on-time delivery. I usually handle one project at a time to ensure full attention and quality. I’d love to discuss your project requirements—I’m available this week for a quick call to get things moving. Best regards, Abbas Jawadwala SMB ElectroTech

₹25,000 INR in 7 days

4.8

(38 reviews)

5.4

@Mahmoud00Ibrahim

Hello, I’m very interested in your project. I have strong experience in PCB design, STM32-based systems, and audio hardware, and I can deliver a compact, professional-grade solution for your 2-channel USB audio interface. Scope: Schematic design integrating STM32F407VGT6, PCM1863 ADC, phantom power (+48V) with boost converter, and LEDs. 4-layer PCB layout (100–120 mm width, 35 mm min height) with XLR + TRS inputs, USB-C ports, and proper partitioning (analog, digital, HV zones). Deliverables: Schematics, PCB Gerbers, BOM with alternatives, 3D PCB model, and design documentation (power, grounding, flashing). Features: USB-C data + power (when phantom off). Separate USB-C power for +48V phantom. Bootloader-only USB firmware update (no pogo/JTAG). Phantom power only on XLR input with isolation. Power and Phantom LEDs. Timeline: 7–12 days total (schematic → layout → docs). Payment: 35% upfront, 65% after schematic approval, balance upon final delivery. My approach ensures clean audio performance, manufacturability, and cost efficiency. I’m ready to start immediately and deliver a reliable design meeting all your requirements. Best regards,

₹25,000 INR in 7 days

5.0

(4 reviews)

4.2

@alishba438

I will do:- Simple to advanced Circuit design and analysis using software tools such as KiCAD, Proteus, Altium Designer, Allegro, PADs, and Eagle My package provides the following services - Schematic drawings - Gerber files - Netlist generation - Pcb's - BOM generation (Professional BOM) - 3D Models of the Actual PCB - ECAD Library Administration I will also generate Gerbers on existing PCBs files

₹32,000 INR in 7 days

5.0

(5 reviews)

3.7

@as348

With more than 10 years of experience in circuit design and development, I come to you with a solid background in industrial, medical, and consumer electronic products. This has presented me with profound knowledge in EMI/EMC and Signal Processing that I believe is essential in driving success for your Compact 2-Channel USB Audio Interface Design project. Additionally, skillful navigating with complex frameworks like the STM32F407VGT6 microcontroller equipped in this product, makes me an invaluable asset for this task. Furthermore, I have an established proficiency in designing PCB layouts given space constraints - adept at strategically placing components close but not interfering to ensure optimum efficiency. Since your project poses the unique challenge of placing the XLR and TRS ports side-by-side and the USB-C power port close by, I am confident in overcoming this challenge whilst maintaining the highest possible standards. The fact that you want a standard flash firmware solely through the USB-C data port using STM32's DFU - which I am experienced in optimizing performance for, adds assurance to my ability to flawlessly execute your demands. I

₹25,000 INR in 7 days

0.0

(0 reviews)

0.0

@CHAPAPPA

Hello, Thank you for the description, it gives a full, detailed overview of the project and the device requirements and expectations. I'm an IoT and embedded systems engineer with experience in PCB design for consumer devices with Altium Designer and KiCad. I've read all the requirements you are asking for and I'm familiar with them, especially USB-C integration. I'm familiar with STM32 chips in multiple packages. I have some of my previous PCB projects in my profile that you can check out. Feel free to contact me. Best regards, Fraj ben Abedlaziz, IoT and embedded systems engineer,

₹20,000 INR in 7 days

5.0

(1 review)

0.0

@Alfons5

Hello!!!! Your Project looks challenging. I can help you, be sure. Let's keep a chat to see what can be done. Bye!!!

₹25,000 INR in 21 days

0.0

(0 reviews)

0.0

@carlosnicolasa

Hello, I am an electronics engineer specializing in hardware and firmware design for digital audio and communication systems. I have experience working with STM32 (F4 series), professional ADC/DAC converters, and multilayer PCB design optimized for low crosstalk and clean audio. I can deliver: - Detailed schematic and 4-layer PCB in Altium/KiCad. - Optimized BOM with available and reliable components. - Isolated and stable boost converter for 48V phantom power. - USB-C communication with native STM32 support. - Manufacturing-ready Gerber files + 3D CAD. - Full documentation and post-delivery support. My focus is professional quality with controlled costs, ensuring a reliable and producible design. Shall we move forward with a brief meeting to define technical details and timelines? Best regards

₹27,000 INR in 14 days

0.0

(0 reviews)

0.0

@marioomapo

Hello Dear Client, I have carefully reviewed your requirements for a 2-channel USB audio interface with STM32F407, PCM1863 ADC, side-by-side XLR/TRS ports, and dual USB-C ports. I fully understand the challenges of combining analog, digital, and high-voltage sections on a compact 4-layer PCB while ensuring reliable phantom power and clean audio signal. (1). PCB Design: 4-layer FR4 layout optimized for analog, digital, and 48V phantom power isolation. Placement of XLR/TRS and USB-C ports for manufacturability and enclosure fit. Proper high-voltage routing, partitioned power planes, and solid grounding. (2). Circuit & Firmware Support: Integration of STM32F407 and PCM1863 ADC for accurate audio capture. Bootloader-enabled USB-C firmware flashing with required resistors. LED status indicators for power and phantom power. (3). Deliverables: Complete Gerber files, schematic, BOM, and 3D PCB CAD model. Documentation detailing layout, partitioning, and assembly guidelines. With extensive experience in audio electronics, mixed-signal PCB design, and STM32-based systems, I can ensure your interface is compact, manufacturable, and production-ready. We can discuss technical details in private chat to align on timeline and priorities. Thank you, Mário Apolinário

₹25,000 INR in 7 days