Earin M-2 Earbuds: Upgrade and Miniaturization

@Mahihassi

As an electrical engineer specializing in firmware development, PCB design, and complete IoT product engineering, I'm the perfect candidate to lead your project. I have a master's degree in embedded systems and have gained extensive experience working with TWS earbuds prototypes, micro-soldering, and compact PCBs - all of which are crucial for the successful completion of your project. Moreover, my background in balanced armature driver integration and true wireless builds align well with the upgrades demanded. In my portfolio, you'll find a series of impressive projects where I've showcased my ability to optimize embedded coding and drivers for maximum performance. My skills with Altium Designer, KiCad, Eagle, EasyEDA and Target make me particularly adept at PCB layout; something that your venture requires. I also have noteworthy experience integrating AI and developing 3D CAD modeling which could come handy in case we need any modifications regarding electrical connection or adjustments to reduce the shells.

@markoa7

Hello, I’ve reviewed the Earin M-2 teardown and the target miniaturization goal. My approach starts with a compact 3D CAD shell optimized for 20x13x12 mm, followed by a lean PCB stack that preserves NFMI/Bluetooth function while reducing volume. I’ll source a micro balanced-armature driver and a 40-50 mAh cell, and validate TWS pairing and audio performance with a focused test plan and modular prototyping. Deliverables: new shell design (3D printed or molded), compact PCB layout, component sourcing, full assembly and functional testing, audio tests and TWS validation. What are the tolerance constraints for the acoustic port and venting during miniaturization? Best regards, Marko Aleksic

@Adeel2k14

I can help you in PCB design, compoennt sourcing and PCB testing after production by profession i am electronics engineer having expertise in PCB and circuit designing. I can help you in this task, i have worked on audio products and produce a portable bluetooth audio speaker. I can show you my previous work sample for your reference. Regards, Muhammad Adeel

@AwaisChaudhry

Hello, I understand you want a smaller, fully functional Earin M-2 style TWS that keeps core features while cutting protrusion. I’ll redesign the shell to under 20×13×12mm, source compact components, and create a compact PCB layout that fits the reduced volume without sacrificing BT/NFMI performance or touch controls. My approach includes: 1) reverse-engineer the current M-2 layout from your teardown and measurements to map critical clearance and heat paths; 2) iterate a miniaturized shell using 3D CAD, then validate with rapid 3D prints or molds; 3) select a micro driver, slim BA, and a 40-50mAh battery, with optimized battery protection and RF layout; 4) design a compact PCB optimized for impedance, thermal, and NFMI/Bluetooth coupling within the new envelope; 5) assemble and test both audio quality and true wireless pairing, including real-world fit and endurance tests; 6) provide two complete prototype pairs and a documented test suite with pass/fail criteria. What is the target cadence for delivering prototypes (e.g., weekly sprints, milestones) and how will you handle approval for iterations between engineering and university review? What are the acceptable suppliers for mini components (BA driver, NFMI, BT module) and is there a preferred signaling approach for touch controls? Do you require a specific certification path (e.g., EMI/EMC, safety) or is it scope-limited to functional testing? How strict is the 4–6 week milestone window and is weekend work acceptable?

@sahildogra222

Hey, You are looking for Earin M-2 Earbuds: Upgrade and Miniaturization "Lets Gets Started, I know you have several tempting proposals here, but I guarantee you to be impressed by my work. I have various skills in design, Illustration, Photoshop, Graphic Design, Logo Design and Illustrator. If you give me this chance you will be impressed, because I guarantee that I will meet your expectations. I invite you to get a look at my portfolio You Can see it from here : https://www.freelancer.com/u/sahildogra222 If you have any questions or queries, do not hesitate to contact me. I hope to start working with you. With regards! SAHIL

@hayat38402

Hi, how are you doing? I went through your project description and I can help you in your project. your project requirements perfectly match my expertise. We are a team of Electrical and Electronics engineers, we have successfully completed 1000+ Projects for multiple regular clients from OMAN, UK, USA, Australia, Canada, France, Germany, Lebanon and many other countries. We are providing our services in following areas:  Embedded C Programming.  VHDL/Verilog, Quartus/Vivado, LABView/ Multisim/PSPICE/VLSI  MATLAB/SIMULINK  Network Simulator NS2/NS3  Microcontroller like Arduino, Raspberry Pi, FPGA, AVR, PIC, STM32 and ESP32.  IDEs like Keil MDK V5, ATmel studio and MPLab XC8.  PLCs / SCADA  PCB Designing Proteus, Eagle, KiCAD and Altium  IOT Technologies like Ethernet, GSM GPRS.  HTTP Restful APIs connection for IOT Communications. Also, we have good command over report writing, I can show you many samples of our previous reports. Kindly consider us for your project and text me so that we can further discuss specifically about your project's main goals and requirements.

@CreativeDesign50

Hello, I understand the project requirements for the upgrade and miniaturization of the Earin M-2 earbuds to reduce ear protrusion. My approach involves redesigning the earbuds to achieve a smaller size while maintaining or closely matching the current features. I will focus on creating a new shell design, custom PCB layout for reduced volume, component sourcing for miniaturization, full assembly with functional testing, and audio test validation. https://www.freelancer.com/u/CreativeDesign50 Before proceeding, could you please provide more details on the specific BA driver, BT/NFMI modules, and battery capacity preferences? This will help in ensuring precise component selection and successful prototype development. Best regards, Kirandeep K.

@Feriver

Hello, I understand that you are seeking a prototype engineer to miniaturize the Earin M-2 earbuds while preserving core functionality. My approach will include designing a reduced-volume shell (<20×13×12mm) with 3D modeling for printing or molding, creating a compact PCB layout optimized for component placement, and sourcing miniaturized parts such as a BA driver, Bluetooth/NFMI module, and 40–50mAh battery. I will assemble and test 1–2 fully functional prototypes, verifying playback, TWS pairing, touch controls, and audio performance to ensure the redesign meets your feature priorities while reducing ear protrusion. I have hands-on experience developing TWS earbuds, performing micro-soldering on compact PCBs, integrating balanced armature drivers, and delivering fully tested wireless prototypes. My goal is to provide a reliable, user-ready miniaturized design with thorough validation within the 4–8 week timeline. Thanks, Asif

@redbrickamerica

Hello there ! I am ready to start your Earin M-2 miniaturization project. I will redesign the shell (Fusion 360), create a compact PCB layout (Altium/KiCad), source a mini BA driver, BT/NFMI module and 40-50mAh battery, and deliver 1-2 fully working prototype pairs with assembly, audio testing and TWS validation. I have experience in micro-soldering, compact PCB routing, BA integration and 3D printing for housing iteration. Deliverables: 3D shell files, PCB Gerbers, BOM with sources, assembled prototypes and test reports. Timeline and scope will match your 4-8 week window. Best regards, Cheers , RedBrick American Engineering

@electronicsdone

Best TWS Earbuds Hardware & Miniaturization Expert ⭐⭐⭐⭐⭐ Hi, Thank you for posting your project, “Earin M-2 Earbuds: Upgrade and Miniaturization.” I’ve reviewed your requirements and can help you redesign the existing Earin M-2 platform into a significantly smaller, fully functional true-wireless prototype while preserving core features and audio performance. I bring 11+ years of experience in compact consumer electronics, wearable audio hardware, and ultra-dense PCB design. I’ve worked extensively on true wireless earbuds, lithium microbattery systems, RF/BT layouts, and enclosure-constrained mechanical design—delivering working prototypes suitable for academic validation and future production paths. ✅ How I’ll Help You Succeed 1. Redesign the earbud internal architecture to achieve the target <20×13×12 mm volume with minimal protrusion. 2. Develop a custom, space-optimized PCB supporting BT/NFMI synchronization, touch controls, and efficient power management. 3. Design or refine the shell for comfort, acoustics, and manufacturability (3D printed or molded). ✅ Before I Start, One Quick Question: Would you like me to begin with internal layout feasibility and PCB miniaturization planning based on your target dimensions, or start from shell redesign and component selection first? If you share that, feel free to message me, and we can align quickly. Best regards, Prat PCB Must Innovations

@CaliforniaVibe

Hello, Precision miniaturization, advanced PCB layout, and complete TWS functionality are the core strengths we bring to your Earin M-2 redesign. We reviewed your requirements for reducing shell volume while maintaining NFMI sync, BA driver integration, battery efficiency, and prototype assembly. Our team handles compact PCB engineering, micro‑assembly, and full testing, ensuring a fully working pair that meets your target dimensions. We deliver optimized shell modeling, sourcing, and validation. Could you confirm whether you prefer a single-piece or split internal PCB structure for your miniaturized prototype? Thank You , THE CALIFORNIA STUDIO

@yaroslavmark

✅Okay, I got what you want exactly. I am a TWS hardware and embedded systems engineer with over 10 years of experience, providing compact PCB design, Bluetooth/NFMI audio systems, balanced armature integration, and rapid prototyping for wearable electronics. This project is very similar to my previous works. I’ve led a true wireless earbud redesign where we reduced enclosure volume by ~30% by switching to a flex-rigid PCB, a custom 45mAh curved Li-Po, and a smaller Knowles BA while maintaining 4+ hours playback and stable left-right sync. I also handled NFMI tuning, antenna clearance testing, and full functional validation on two working prototype pairs. ✅ So, I will divide your project like following: ⚡ Review teardown data, target dimensions, and feature priorities to finalize the miniaturization strategy ⚡ Redesign PCB layout and select ultra-compact audio, RF, and power components ⚡ Create and iterate the new shell design with 3D-printed prototypes for fit and protrusion testing ⚡ Full assembly, firmware bring-up, pairing validation, and audio performance testing Via private chatting or meeting, I will provide the creative idea and solid technical solution for your project, and I’d like to discuss the budget and timeline in detail. Best regards, Yaroslav

@urosg3

Hi there, I understand you require a redesign of the Earin M-2 earbuds to reduce size and ear protrusion, with functional prototypes. For your project, it’s essential to deliver a miniaturized shell design, custom PCB layout, and fully functional TWS earbuds that meet your target specs. As a seasoned hardware engineer with over 6 years of experience, I’ve worked on several TWS earbuds prototypes, including compact PCB design and audio testing. I am confident I am the ideal candidate for your project. You can view my portfolio here: https://www.freelancer.com/u/urosg3 , and I’m happy to share relevant plans and samples upon request. I'm ready to start working on your project right away. I look forward to working with you.

@Penmate

Do you have any tolerance on battery life or audio fidelity, or should the prototype maintain the exact original specs despite the smaller shell? I will take your Earin M-2 teardown data and design a fully miniaturized TWS earbud within the <20×13×12mm target dimensions. This includes a compact 3D-printable shell, a custom PCB layout optimized for space, and careful component sourcing to fit a smaller BA driver, NFMI/BT module, and 40–50mAh battery. Once assembled, I will conduct functional tests to verify audio performance, touch controls, and true wireless synchronization, delivering 1–2 fully working prototypes. Can you confirm if you’d like me to explore alternative ultra-compact drivers if exact BA sizes aren’t available?

@borisdeveloper71

Hi there, I’m confident in my ability to deliver this project to a high standard. I take the time to carefully review each client’s requirements to ensure I fully understand the scope before submitting a proposal. Every project deserves a thoughtful, tailored approach, and I treat each one with the attention it deserves. I have solid experience in this field and would welcome the opportunity to discuss your project in more detail to better understand your goals and expectations. Clear communication and understanding are always my top priorities. I am available to start immediately and am committed to delivering high-quality results on time. With my strong background in Electronics, Microcontroller, PCB Layout, Arduino, 3D Design, 3D Printing, PCB Design and Layout, Prototyping, I will work diligently until you are completely satisfied with the final outcome. I look forward to the opportunity to collaborate with you. Thank you for your time and consideration. Best regards, Boris

@jefereng

Hello. About a year ago, I worked on a custom TWS earbud prototype for a startup where we had to shrink an existing 25×16×16mm shell down to under 20×14×13mm. I designed a compact PCB to fit within the smaller shell while keeping the Bluetooth and NFMI modules fully functional. I sourced tiny balanced armature drivers and 45mAh batteries that matched the original sound and playback time. I performed micro-soldering on both the PCB and the battery connections, ensuring reliability during assembly. I 3D printed several shell prototypes to test ergonomics and reduced ear protrusion without compromising comfort. A few questions to help me better understand your needs ★ Are there any features from the current earbuds that you consider absolutely essential versus optional in the mini version ★ Do you have a preferred material for the shell, or are you open to both 3D printing and molded options ★ What is your priority between battery life and shell size if compromises are needed ★ Are there any additional sensors or indicators that must be integrated into the miniaturized version ★ Will you provide access to the original PCB schematics or should I reverse engineer the layout from the teardown Looking forward to collaborating with you! Drop me a message anytime, and we can talk more about the project and your goals. Best regards Jeferen

@tetianam8

As an experienced Electronic Hardware and Firmware Engineer with over 15 years in the industry, I have successfully designed and developed various complex PCB layouts, embedded systems, and IoT solutions. My skills in PCB Design using Altium Designer, KiCAD, Eagle, coupled with my solid background in embedded systems like ARM Cortex and STM32, position me perfectly for your project. Additionally, my specific expertise in balancing competing features within restricted dimensions makes me the best fit for this project. I've consistently proven my knack for miniaturization and compact PCB integration which aligns with your need to reduce the size of the Earin M-2 earbuds. My micro-soldering proficiency will be crucial for ensuring a successful redesign. Furthermore, having hands-on experience in TWS earbuds prototypes and relevant advanced skills like programming languages such as C/C++, Python, and various communication protocols ranging from I2C to CAN sets me apart from other candidates. My ultimate goal has always been to deliver high-quality products which aligns with your need for meticulously tested audio output and TWS pairing validation. Let's work together to actualize your vision and meet your deadline for your UK based project.

@hancho6319

Thank you for sharing this compelling Earin M-2 miniaturization project. I have direct experience with ultra-compact TWS prototypes and understand the critical challenge: reducing volume by 33% while maintaining full functionality, battery life, and audio quality. My approach is holistic: 1. PCB Optimization: I will redesign the main board as a rigid-flex or multi-board stacked assembly to utilize every cubic millimeter, moving from a single 2D layout to a 3D-optimized architecture. This is essential for hitting <20×13×12mm. 2. Component Selection: I will source the smallest available BA driver (e.g., Knowles or Sonion) and a 40-50mAh LiPo cell from vendors like Varta or EEMB, prioritizing volumetric efficiency. 3. Enclosure Design: The shell will be modeled in Fusion 360 for high-resolution SLA printing (or urethane casting if required), with precise internal cavities for all components and NFMI antenna placement. 4. Assembly & Test: I have micro-soldering equipment and experience assembling sub-miniature electronics. I will deliver 1-2 fully tested pairs with verified TWS pairing, audio quality, and touch response. I can provide a portfolio of previous compact wireless audio prototypes. Estimated timeline: 3-5 weeks.

@peconsultation

Hello! With over a decade of experience as an Architectural and CAD Designer, I bring precision, creativity, and technical expertise to your Earin M-2 miniaturization project. I specialize in creating accurately scaled 3D models and prototypes, ensuring your earbuds maintain full functionality while achieving the desired compact form. My proficiency in 3D printing and Arduino integration adds an extra layer of capability, allowing seamless component alignment and operational reliability. I am meticulous with detail, provide consistent updates, and prioritize clear communication across time zones. By choosing me, you secure a professional dedicated to turning your concept into a precise, functional, and elegant prototype.