Nerivio Device Prototype Development

@markoa7

My years of experience and expertise in digital electronics, electrical engineering, and electronic design make me an excellent fit for your project. I have a strong background in PCB design & development, specializing in power supply circuits and multilayer designs for embedded systems. This has equipped me with the skills you're seeking for your device's hardware design. Additionally, my proficiency in firmware development, particularly in coding waveform generation, timing, and UI control using C/C++, will be valuable in developing the Nerivio prototype. I can seamlessly integrate multiple communication protocols which is essential for your project's success. Beyond just technical skills, I strive to deliver cost-effective, high-quality solutions without compromising performance or deadlines. I am well-versed in complying with industry standards like the IEC-60601, further ensuring your device's safety and efficacy. Let us connect and discuss further on how I can effectively contribute to making your vision a reality.

@leonidye

Hi, This project is of critical importance, and I highly value the rigorous standards you have established regarding safety, simulation, and production-quality design. I possess extensive experience in the fields of precision analog systems, constant current drivers, and embedded firmware—including low-noise stimulation circuits. I will design a fully integrated, bidirectional constant current system that guarantees both safety and performance through stable high-voltage stages, precise 0–25 mA control, and charge-balanced waveform generation. This solution will incorporate both hardware protection features (such as current limiting and fault detection) and robust embedded C/C++ firmware to manage timing, control, and safety interlocks. Prior to final PCB fabrication, I will validate current accuracy, waveform integrity, transient behavior, and thermal characteristics using SPICE and MATLAB simulations. The final deliverables will include schematics, a low-noise PCB layout, a complete Bill of Materials (BOM), firmware, and safety-centric design documentation aligned with IEC 60601 principles. I have reviewed the materials you provided and am ready to commence the project immediately. Best regards.

@Ekarthaan

Hi Cesurcan D., Last week I built a very similar REN‑style stimulator, and i’m confident I can handle this really well. I know constant‑current (0–25 mA), high‑compliance (up to ~85V), true biphasic charge‑balanced waveforms, and safe, low‑noise PCB design. I’ll prove the circuit in SPICE/MATLAB before layout and design for clean EMI from day one. i would like to know the below. 1) What exact waveform spec do you need: pulse shape (symmetric biphasic?), pulse‑width range, frequency, burst pattern, max current, and is 85V the fixed compliance target? 2) Which safety class/power model: IEC 60601‑1 BF or CF, battery type and charging method, and UI via on‑device buttons only or also BLE app? I think we should. 1) Add active charge‑balance monitoring with a DC‑offset watchdog and auto‑shutdown on any fault to protect tissue. 2) Isolate HV analog and digital domains (medical DC‑DC + ADuM), with star‑ground and input/output filtering for rock‑solid EMI immunity. Lets follow a plan like this. 1) I capture and freeze specs, safety targets, and UI flow in a short PRD. 2) I build LTspice/Matlab models, run worst‑case/thermal/EMI and charge‑balance sims, share plots and pass/fail margins. 3) I design schematic and low‑noise PCB with proper creepage/clearance, BOM, and DFM checks. 4) I code the waveform/timing/UI, add self‑test and calibratoin, validate on loads, then deliver sims, firmware, test report, and fab‑ready files

@shykhAbubakar

Hi, I am ready to support the design and prototyping of your precision grade stimulator device. The work will ensure safe constant current driver operation, verified simulation, and manufacturable PCB outputs optimized for low noise and EMI compliance. The designs will be aligned with IEC 60601 and IPC 2221 along with other relevant standards for biomedical electronics. Before moving forward, do let me know: 1. Required compliance voltage range should the design be modular for lower ranges too? 2. Preferred simulation environment SPICE or MATLAB for waveform verification? Project Deliverables 1. Hardware schematic and PCB layout 2. BOM and Embedded firmware Tool I Use • Altium Designer / KiCad I have 7+ years in PCB and biomedical hardware design. Some projects include: • Wireless SPR Sensor Board biosensor PCB with analog amplification • Raspberry Pi ECG Processing System real time biomedical signal acquisition Warm regards, Abubakar

@mahmoudralizadeh

Hello, I read through your project description for the REN-style stimulator. This is exactly the kind of hardware I specialize in. Designing a medical stimulator with an 85V compliance requirement is not a standard engineering task—the core challenge is managing the switching noise from the 85V boost converter on a compact mixed-signal PCB so it doesn't inject noise into the logic or the analog control lines. Beyond that, guaranteeing strict active and passive charge-balancing is non-negotiable to prevent tissue electrolysis or necrosis. Delivering a stable biphasic constant current pump (0-25mA) that maintains accuracy across wildly varying skin impedances requires a very specific approach to the analog front-end. I have spent years engineering high-reliability, low-noise systems for biomedical, automotive, and industrial applications. I’ve built these exact types of high-voltage medical stimulators multiple times. I know the pitfalls of EMI routing around switching nodes and what it takes to design a board that actually passes IEC 60601-1 safety testing. Regarding your request for portfolio examples: because I work under strict NDAs with my medical and industrial clients, I cannot publicly attach the schematics, Gerber files, or firmware for these specific stimulators. However, my past work directly includes a 100V compliance biphasic TENS/REN prototype and a wearable low-noise biometric sensor. If you send me a message, I can walk you through the exact technical architecture, the MCU choices, and the analog front-end topologies (like the Howland current pumps) I used to solve these problems. To address your simulation requirement—my standard workflow mandates rigorous SPICE/MATLAB simulation of the analog drive stage before any PCB layout begins. This guarantees the circuit behaves predictably under edge-case loads and prevents EMI/noise issues when we move to the final production board. A couple of quick questions before I review your documentation: 1. Are we targeting a specific load impedance range for the 85V compliance (e.g., 1k - 3.3k Ohms)? 2. Do you have a preference for the core MCU and connectivity? I frequently use an ultra-low-power STM32 paired with a separate BLE module to better manage power and noise, but a single-chip SoC like the nRF52 is an option if board real estate is the primary constraint. Send over the simplified technical docs when you have a moment, and we can discuss the architecture in detail. Best regards.

@engrhasan01

Are you looking for a medical-grade stimulator prototype with reliable constant-current control, clean biphasic waveforms, and safety-first design aligned with IEC 60601 practices? I’m an Electrical & Power Electronics Engineer with 5+ years of experience in precision analog design, biomedical signal systems, and STM32-based embedded control, including low-noise PCB design and safety-critical firmware. Approach • Design biphasic constant-current driver (0–25 mA) with high compliance (up to 85 V) using precision current mirrors / op-amp control loops • Implement charge-balanced waveform generation (H-bridge or polarity switching) to prevent tissue damage • Integrate protection layers: current limiting, watchdog, fault detection • Low-noise PCB layout (segregated analog/digital ground, shielding, filtering, creepage/clearance) • Firmware for waveform timing, amplitude control, and UI interface Deliverables • Schematic + PCB (KiCad/Altium) + Gerbers • BOM (medical-grade, globally available components) • Embedded firmware (C/C++ + build + documentation) • Simulation reports (waveforms, safety validation) Focus • IEC 60601-oriented design practices • Stable constant-current output across load variations • Production-ready, low-noise hardware I understand the sensitivity of biomedical systems and will ensure precision, safety, and reliability from design to prototype. Best regards, Hasan

@uzairelectronics

Hello, I can support your Nerivio-like biomedical stimulator project with focus on precision constant-current biphasic stimulation and safe embedded control design. I have experience in embedded systems, analog power electronics, PCB design, and low-noise current regulation circuits. I can develop the full hardware design including schematic, PCB layout, and BOM, with emphasis on a stable biphasic constant-current driver (0–25 mA) and high compliance voltage handling up to ~85V. The design will ensure charge-balanced waveforms, proper isolation between analog and digital sections, and low EMI for safe operation. I will also provide embedded C/C++ firmware for waveform generation, timing control, and safety logic such as current limiting and fault handling. Before finalizing the PCB, I will validate the circuit using simulation (SPICE or equivalent) to confirm waveform accuracy, current stability, and protection behavior under different load conditions. The final design will be optimized for low noise, reliability, and manufacturability, following best practices for sensitive biomedical electronics. Best regards, Engr. Muhammad Uzair

@Mwaleed30

Being an Electronic Engineer, Hardware Designer and a skilled PCB Designer with 3 +years of experience I make proper R&D projects Full schematics and real life single layer ,2 layers ,4 layers ,6 layer and multi-layers PCBs projects (i.e: 1:PCB of compact ear buds 2:Pcbs for compact usb with advanced security features 3:Pcbs which involves USBs 4:Also i made many large projects which handles high voltage AC and DC 5: 6 -layers PCB of Arm Cortex Processor involving Programming 6: Programmable Frequency Generator PCB 7: Compact Smart SOS PCB 8: High Volatge Ac to DC Converter with MCU STM32 programmability’s for 10KW system 9: 10KW AC Inverter with output voltage 24V 10: Qi 1.3 Wirless Charger Transmitter and Reciever 11: PCB for agricultural watering system that controls 50 fig trees with expansion capability to 100 trees) 12: Custom IO Board Design for Raspberry Pi CM5 with Integrated RP2040 And many more I have advanced level grip on softawares like Easyeda-Pro ,Kicad, Altium I will show you my PCB work separately I will handle your project and made it perfect in the best cheapest price and do its customisation First see me work then Hire me You can also see my Portfolio which reflects some of my PCBs projects In the end i will assure you that you will get professional level and great quality work in the best price Thankyou

@haseebsidd07

Hey , I just finished reading the job description and I see you are looking for someone experienced in Electrical Engineering, Prototype Design, PCB Layout, Embedded Systems, Electronic Design, MATLAB, Biomedical Engineering, Digital Electronics, Electronics and Medical Products. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am- 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Abdul Haseeb Siddiqui

@adily1

Hey , I just finished reading the job description and I see you are looking for someone experienced in Medical Products, Digital Electronics, MATLAB, Electronics, Embedded Systems, Electronic Design, Prototype Design, Electrical Engineering, Biomedical Engineering and PCB Layout. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am - 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Adil.

@hayleyc27

With over six years as an electrical engineer, I bring to the table a robust skill set that spans multiple technical domains. I am particularly apt in C and C++ programming languages, something that bears significance for your project considering its requirement of firmware development using Embedded C/C++. Further, my hands-on experience in medical/biomedical hardware aligns closely with the specific request in your Nerivio Device project. I am not only well acquainted with important electrical medical safety standards such as IEC 60601 but also conversant with essential aspects like zero issues with EMI and signal interference during manufacturing. Another strong point of mine pertains to my expertise in analog and digital circuit design, schematic capture, PCB layout and development, circuit simulation and analysis, FPGA using Verilog and VHDL, and electronic circuit prototyping. These skills are paramount for your requirements demanding high compliance voltage management up to 85V, charge-balanced waveforms for tissue safety, and verified simulation prior to finalizing the design.

@imranfaiz948

Hi, I understand this is a precision medical-grade stimulator and needs a careful, safety-focused design. I can handle the full hardware + firmware, including a stable biphasic constant-current driver and low-noise PCB. I’ll validate everything in simulation before layout to ensure it works reliably. The final design will be clean, production-ready, and optimized for safety and performance. I also have a team to support complex parts if needed. Let’s review your documents and get started. Best regards, Engr. Muhammad Imran

@alexsanderg3

Maximum allowed current and voltage limits for patient safety? Any requirement for: Isolation (patient vs system)? Leakage current limits? The biggest challenge is delivering precise biphasic constant-current stimulation while maintaining charge balance, patient safety, low noise, and stability across changing tissue impedance. I have experience with precision embedded systems, constant-current drivers, low-noise PCB design, waveform control, and safety-focused electronics. My approach would start with defining the safest stimulation architecture, including compliance voltage handling, current limiting, fault detection, and a stable biphasic output stage. Before layout, I would validate the design in SPICE/MATLAB to confirm waveform accuracy, current regulation, charge balance, and protection behavior. The PCB will be optimized for EMI control, clean grounding, analog signal integrity, and isolation where needed. Firmware will be written in embedded C/C++ for accurate timing, waveform generation, parameter control, watchdogs, and safety shutdown logic. Deliverables will include schematic, PCB layout, BOM, simulation results, firmware, and clear prototype documentation. The goal is a reliable, medical-grade prototype that performs safely and consistently under real test conditions. Best regards.

@ostronik

Hi, Greetings from OSTronik India! We are a technology-driven company specializing in Power Electronics and Embedded System Design integrated with Artificial Intelligence (AI) and Mobile Application Development, delivering reliable, industrial-grade electronic and software solutions—from concept to mass production, all under one roof. Our in-house capabilities include R&D, Firmware Development, Hardware Design, Mobile Application(Android & iOS), Prototyping, and Scalable Mass Production, with a strong focus on quality, performance, and cost efficiency. Core Expertise: • Microcontrollers: PIC, STM32, ESP Family, AVR. • Microprocessors: Raspberry Pi • Development Tools: MPLAB X IDE, STM32CubeIDE, Arduino IDE, Atmel Studio, VS Code • Hardware Design: Industrial-grade multilayer PCBs using Altium Designer with optimized power design, isolation handling, and EMI/EMC compliance • Communication Protocols: UART, SPI, I²C, CAN, Modbus, MQTT, LAN, S-Bus, RS-485 Mobile Application Capabilities: • Custom Android & iOS mobile applications for device control, monitoring, and data visualization • Real-time dashboards, cloud connectivity, and secure user authentication • Seamless integration between IoT platforms and mobile apps We have successfully transformed multiple concepts into market-ready electronic and mobile-enabled solutions. We would be glad to share a brief reference video. Let’s schedule a meeting to discuss your requirements in detail. Best Regards, Team OSTronik India

@yushengl9

Hi, I have extensive experience in designing biomedical and medical-grade embedded systems, and I can develop a high-precision stimulator prototype similar to the Nerivio (REN) device, ensuring safety, reliability, and production-ready quality. Scope of Work 1. Hardware Design Full schematic and PCB layout optimized for low-noise and high-precision operation Selection of components suitable for biphasic constant current drivers (0–25 mA) with high compliance voltage (up to 85 V) Charge-balanced waveform circuitry to ensure tissue safety EMI, grounding, and shielding strategies integrated into layout Organized BOM ready for prototyping and potential scale-up 2. Firmware Development Embedded C/C++ code for waveform generation, pulse timing, and device control Support for UI elements (buttons, indicators, or small display as required) Safety monitoring and fault detection routines 3. Simulation & Verification Full circuit simulation using SPICE, MATLAB, or equivalent, demonstrating correct waveform generation and current regulation Verification of charge-balance and compliance under expected load conditions Documentation of simulation results before layout finalization 4. Production-Ready PCB Layout optimized for manufacturability with zero signal interference or noise issues Compliance with medical-grade safety practices Ready for prototype fabrication Best regards

@patrickA123456

What exact stimulation waveform parameters are required (frequency, pulse width, burst timing, duty cycle, etc.)? Is the target output strictly biphasic constant-current, or are multiple stimulation modes required? What load impedance range should the current driver support? Is the 85V compliance generated onboard or from an external supply? One of the biggest challenges in biomedical stimulation hardware is achieving stable biphasic constant-current delivery with high compliance voltage while guaranteeing charge balance, patient safety, and ultra-clean signal integrity under real manufacturing conditions. I’ve worked on embedded hardware, precision analog circuits, mixed-signal PCB systems, low-noise power design, waveform-generation architectures, and safety-conscious electronics where reliability and electrical behavior were critical from both the hardware and firmware side. I can develop the full schematic, PCB layout, firmware, simulation workflow, and manufacturing-ready design package for a REN-style stimulation prototype while focusing heavily on current stability, EMI reduction, isolation strategy, and controlled waveform behavior. My experience includes embedded C/C++, precision signal control, power regulation, sensor/driver integration, and PCB layouts requiring careful grounding, return-path management, and noise-sensitive routing practices.