Circuit Design Jobs

My inspection system is already on the production floor, driven by C-based firmware, yet the electronics are showing their age. I need a seasoned PCB designer to breathe new life into the hardware without disturbing day-to-day operations. Your core mission is to redesign the existing boards, swap out obsolete parts, and—above all—drive down electrical noise that is creeping into both data and video paths. Why the focus on noise? It is the single biggest drag on reliability, and the current communication modules are the worst offenders. While you tackle that, you will also be refining video signal integrity, tightening power regulation, and keeping every subsystem talking happily to the next. Compatibility with the present firmware and mechanical layout is non-negotiable; I c...

I am looking for an experienced PCB designer to create a 4‑layer carrier board for a Raspberry Pi Compute Module 5 (CM5). The board integrates several existing open‑source hardware concepts into a single PCB, with limited original R&D but careful integration and cleanup. Scope of this first project - Review and consolidate existing reference schematics (I will provide open‑source designs and documentation). - Design the final schematic for: - Raspberry Pi CM5 + power supply - CAN‑based bus for a marine/industrial network (NMEA‑style) - NMEA 0183‑style serial interfaces - Connectors and I/O suitable for a small boat/embedded environment - eDP interface for an external display - PCB layout: - 4‑layer stackup with proper impedance control for eDP - Rea...

I am building a tiny GPS tracker device for my company and need an experienced PCB designer. Project Requirements: - Design schematic and PCB layout for a compact GPS tracker. - Use SIM7080G (LTE/NB-IoT with GNSS) module. - Include SIM card slot, GPS antenna connector, LiPo battery connector, and charging circuit. - Board size should be approximately 18 mm x 20 mm. Deliverables: - Complete schematic - PCB layout - Gerber files for manufacturing - Bill of Materials (BOM) - Pick and Place file (optional) Preferred Tools: KiCad, Altium Designer, or EasyEDA. Experience Required: - Experience designing IoT or GPS tracking devices - Knowledge of RF layout and antenna placement Budget: $30 – $50 (negotiable) Please share examples of previous PCB designs.

I’m ready to move an industrial-grade controller from concept to production and need a designer who has already shipped tight, 6-layer boards. The board must host a main microcontroller, its support circuitry, and several high-current power-regulator stages, all within a restricted outline while meeting EMI/EMC limits typical for factory environments. You’ll start from my block diagram and rough schematic notes, turn them into a production-ready layout, and supply every file the assembly house will ask for: updated schematics, stack-up, Gerbers, drill files, pick-and-place, BOM, and a brief design report explaining how the EMC strategy and size targets were achieved. I’ll be available for rapid feedback on component placement and routing choices, and we’ll sign ...

Title: Transformer Design Engineer Needed – Oil Filled Distribution & Solar Transformers Description: We are setting up a transformer manufacturing unit in Vadodara, India and are looking for an experienced electrical design engineer with expertise in oil-filled power/distribution transformers. This is initially a freelance/consulting role to help us develop transformer designs and technical documentation for manufacturing. Scope of Work: • Design of oil-filled distribution transformers (25 kVA – 100 kVA, 11kV / 433V) • Design of solar inverter duty step-up transformers (250 kVA – 500 kVA, 415V / 690V to 11kV) • Preparation of transformer design calculations (core size, winding design, impedance, losses etc.) • Preparation of GA drawings...

Description Of Project - HRID-AI is a low cost handheld device aimed at estimating ejection fraction using multimodal biosignals (ECG, seismocardiography, and cardiac acoustics). It uses a combination of biosensors to detect abnormalities in ECG, presence of abnormal heart sounds and their interpretation as well as usage of seismocardiographic signals to provide an estimate of Ejection Fraction. The principle has been verified through multiple studies done in reputed institutions The goal is rapid point-of-care triage for echo referral in emergency and low-resource settings in patients of Heart Failure with Reduced Ejection fraction We need your support, skills and expertise for sensor integration, embedded design, signal acquisition. Current Status- We have so far been able to dev...

I will provide the full Proteus project (schematic, PCB, libraries). Your task is to recreate that board in Altium Designer as an exact, bit-for-bit copy—same dimensions, traces, footprints and reference designators—so the migrated file can drop-in-replace the original. Once the design lives in Altium, prepare a complete production package for JLCPCB consisting of: • Gerber set generated with Altium’s CAM outputs • Pick-and-place centroid file (CSV) referenced to the board origin JLCPCB expects • Clean BOM that matches the Altium project and includes LCSC part numbers and JLCPCB’s preferred column headings Please keep the design locked as-is; no routing or placement tweaks. Organise the schematic sheets and PCB libraries so I can add compo...

I need an experienced PCB programmer to reprogram a multi-layer PCB for a coffee maker. The board is used for a coffee maker. Required Skills and Experience: - Proficiency in reprogramming multi-layer PCBs - Experience with radio frequency (RF) applications - Knowledge in embedded systems - Familiarity with brewing settings, temperature control, timing and scheduling, and pump control functionalities

I have a new IoT datalogger concept and need a full-fledged PCB layout that is ready to send straight to fabrication. The schematic is not fixed yet, so I’m relying on your board-level expertise to translate high-level requirements into a clean, production-ready design. What I already know • Form factor: credit-card sized (roughly 85 × 55 mm, single board). • Core: a low-power MCU or module capable of handling multiple digital and analog inputs. • Future-proofing: headers or pads for common temperature, humidity, and pressure sensors as well as optional wireless modules (Wi-Fi, Bluetooth, or cellular—final choice can be discussed once power budget is clear). • Power: ability to accept both rechargeable battery input and external DC (buck/boost circuit...

I need help turning three off-the-shelf modules now sitting in my glasses prototype—a USB 2.0 hub, a USB audio codec (mic plus stereo out) and a dual-channel Class-D amplifier—into one long, narrow board that can slide inside the temple arm. The space I have measured is roughly 80 mm × 15 mm, so the layout has to be linear rather than squarish, with components placed to keep the height profile as low as practical. The board will run exclusively from the host’s 5 V USB rail; no batteries or additional supplies are planned. Because this is for voice prompts and basic media playback, a standard-grade codec is fine—I’m not chasing audiophile specs, just dependable microphone input and clean stereo output that won’t hiss or pop when the amp is idle. A...

I need an experienced PCB designer to edit an existing single-sided PCB design. The current design is in Altium and requires modifications for testing and validation. Requirements: - Change component placement - Route traces Ideal Skills and Experience: - Proficiency in reading and editing Altium - Experience in PCB design, especially for testing purposes - Attention to detail and precision Please provide examples of previous work.

I need help turning three off-the-shelf modules now sitting in my glasses prototype—a USB 2.0 hub, a USB audio codec (mic plus stereo out) and a dual-channel Class-D amplifier—into one long, narrow board that can slide inside the temple arm. The space I have measured is roughly 80 mm × 15 mm, so the layout has to be linear rather than squarish, with components placed to keep the height profile as low as practical. The board will run exclusively from the host’s 5 V USB rail; no batteries or additional supplies are planned. Because this is for voice prompts and basic media playback, a standard-grade codec is fine—I’m not chasing audiophile specs, just dependable microphone input and clean stereo output that won’t hiss or pop when the amp is idle. A...

Description Of Project - HRID-AI is a low cost handheld device aimed at estimating ejection fraction using multimodal biosignals (ECG, seismocardiography, and cardiac acoustics). It uses a combination of biosensors to detect abnormalities in ECG, presence of abnormal heart sounds and their interpretation as well as usage of seismocardiographic signals to provide an estimate of Ejection Fraction. The principle has been verified through multiple studies done in reputed institutions The goal is rapid point-of-care triage for echo referral in emergency and low-resource settings in patients of Heart Failure with Reduced Ejection fraction We need your support, skills and expertise for sensor integration, embedded design, signal acquisition. Current Status- We have so far been able to dev...

I need a self-contained unit that lets me key a number on a small touch screen and see that exact value appear instantly on a free-standing LED numerical tower. The goal is true plug-and-play functionality: once mains power is connected, the system should be ready without additional setup, drivers, or calibration. Core requirements • Input: a touch-screen number pad that accepts whole numbers (ideally up to four digits). • Display: an LED tower that shows the number in bright, easily readable digits; the tower must refresh in real time as I enter or change the value. • Form factor: bench-top or floor-standing, compact enough for shop-floor use, with a single power lead and a secure data link between screen and tower. • Reliability: stable operation for 8+ hours...

I need an experienced PCB designer to edit an existing single-sided PCB design. The current design is in Altium and requires modifications for testing and validation. Requirements: - Change component placement - Route traces Ideal Skills and Experience: - Proficiency in reading and editing Altium - Experience in PCB design, especially for testing purposes - Attention to detail and precision Please provide examples of previous work.

Embedded Hardware & Firmware Expert Needed for Industrial 3-Phase Pure Sine Wave Inverter Project Overview: I am seeking an experienced Power Electronics and Embedded Systems Engineer to design the hardware and firmware for an Industrial-Grade 3-Phase Pure Sine Wave Inverter. The project involves designing multiple PCBs (MCU Motherboard, IGBT Driver, Thyristor Driver, and Sensing Interface) and developing robust firmware for system control, monitoring, and HMI integration. 1. Hardware Specifications & PCB Requirements: You will be responsible for designing the following industrial-grade PCBs: • MCU Motherboard: Based on Texas Instruments (TI) or Microchip architecture. Must handle PWM modulation and system logic. • IGBT Driver PCB (3-Phase): Industrial grade, optimized fo...

I require an experienced electrical engineer to upgrade and design systems for an industrial facility. Key tasks include: - Upgrading power distribution and lighting systems - Designing electrical systems to enhance efficiency and safety Ideal Skills and Experience: - Expertise in electrical design for industrial facilities - Proven track record in system upgrades, particularly in power distribution and lighting - Knowledge of industry standards and safety regulations Please provide examples of past work and relevant certifications.

I am looking for an embedded systems developer to write Arduino code to communicate with the MCP3903 energy measurement IC from Microchip using the SPI interface. The goal of the project is to read voltage measurements from three channels of the chip and output the values through the Arduino serial monitor. Hardware: Arduino board (Arduino Uno or compatible) MCP3903 analog front-end IC SPI communication Requirements: The code should: Initialize SPI communication between Arduino and the MCP3903. Configure the MCP3903 registers correctly for basic operation. Read measurement data from the following channels: CH0 CH1 CH2 Convert the raw ADC data into readable voltage values (or at least raw measurement values). Print the measured values continuously to the Arduino Serial Monitor...

**Project Title:** ESP32 Based Educational Robotics PCB Design **Project Description:** I am looking for an experienced PCB designer to design an educational robotics development board. The board will be used for teaching robotics, IoT, and programming to students . The board should be based on an ESP32 module and must integrate multiple components and connectors so students can easily connect motors and sensors. The board should also be compatible with Scratch, so students can control the hardware using Scratch blocks. The freelancer should also create the required firmware or extension file needed to connect the hardware with Scratch. **Key Features Required:** 1. ESP32 module for WiFi and Bluetooth connectivity 2. Motor driver for 2 DC motors 3. Battery connector for rechargeable L...

Project Brief: Kinetic Pulse PCBA 1. Core Functional Requirements Power Input: Must accept AC input from a linear induction coil (approx. 3,000 turns). Energy Storage: Must use a Supercapacitor (1.5F - 2.0F / 5.5V) as the sole energy storage—No chemical batteries. Power Regulation: A boost converter must provide a stable 3.3V rail even as the capacitor discharges down to 0.7V. Power Efficiency: The entire system must be "Nano-power." Total standby/idle current must be < 1µA to ensure the device holds a charge. Timing Logic: An internal timer must trigger a 100ms audible alert (Buzzer) every 40 seconds. Pressure Sensing: The system must interface with a Force Sensitive Resistor (FSR). State 1: Visual Green LED alert when pressure is applied (> 50g). State 2: Visu...

I’m putting together a very small-scale project on an Arduino Uno and simply need a clean, well-commented sketch that switches an LED on and off. No elaborate libraries or peripherals—just straightforward LED control that compiles in the current Arduino IDE and can be uploaded over the standard USB cable. What I expect from you • An .ino file that drives either the onboard LED (pin 13) or an external LED on any digital pin I can redefine at the top of the sketch. • Clear inline comments explaining each step so a beginner can follow the logic and reuse the code in future experiments. • A short read-me noting the exact IDE version you compiled with and the wiring diagram if you choose an external LED. That’s all—simple, reliable, and ready to ru...

I need an expert to overhaul the control electronics on our solid swimming pool cover and modify the control circuits. The goal is to improve existing functionality and enhance automatic cover operation. Key tasks include: - Improving existing control circuits - Enhancing automatic cover operation Ideal Skills and Experience: - Proficiency in electronics and control systems - Experience with automation and control circuit modification - Knowledge of pool cover or electric gate systems - Strong problem-solving skills

I want a simple two-channel radio link that can do just two things reliably: 1) vary the speed of my brushless DC motor through its ESC (accepts S-Bus or standard PWM) and 2) toggle a single relay on or off. Hardware • I already have the motor, ESC, and relays. • You may choose Arduino, Raspberry Pi, or any Adafruit board—use whichever keeps the build small, inexpensive, and stable. Radio requirements • The handheld transmitter must let me select the operating band with a physical switch: 2.4 GHz, 900 MHz, or 433 MHz. • If LoRa is the cleanest way to hit those bands, great—just make sure the LoRa hop gives me at least a 1 000 ft (≈300 m) clear-line range. Long-range reliability is more important than data rate or extreme power savings...

I'm looking for an experienced PCB designer to create a single-layer PCB for a consumer electronics radio application. The PCB will need to incorporate sensors. Key Requirements: - Design a single-layer PCB - Application: Consumer electronics (radio) - Must include sensor components Ideal Skills and Experience: - Proficiency in PCB design software - Experience with consumer electronics, especially radio devices - Strong understanding of sensor integration on PCBs - Attention to detail and ability to meet deadlines

I need a design review for an electric heater with fan and heating element due to field failures. The specific issues are overheating and electrical shorts. Key Focus Areas: - Electrical Circuitry: Review and identify design flaws - Overheating: Analyze potential causes - Electrical Shorts: Investigate and recommend fixes Ideal Skills and Experience: - Expertise in electrical engineering - Experience with heating appliances design - Problem-solving skills for safety issues

We are building a solar-powered, low-power IoT field device used outdoors in orchards. We need an experienced PCB design engineer to develop a custom PCB that integrates and reliably powers the system. Scope (PCB only): 1) Schematic + PCB layout for a low-power embedded system 2) Power design: solar charging + battery management, stable rails, protection, brownout handling, and power-path switching 3) Interfaces for MCU + peripherals (camera, GNSS, cellular modem, temp/humidity sensor, RTC/power scheduler) 4) Connector selection, ESD/weather-related protection considerations, test points, and design for manufacturability Deliverables: production-ready Gerbers, BOM, pick/place, schematic, and design files (KiCad/Altium—your preference) Nice to have: Prior experience with solar/batt...

I’m building a pair of DIY tower speakers and need a custom-designed, two-layer PCB that ties everything together. The board must fit comfortably inside the cabinet, so please keep your layout within 260 mm (W) × 190 mm (H) and use 2 oz copper. All core functions—amplifier stages, passive/active crossover networks, and an onboard Bluetooth module—have already been mapped out in a block diagram that I will share. Your job is to translate that diagram into a production-ready board, routing power and signal paths cleanly and meeting good audio-grade practices for noise, thermal management, and grounding. Once the schematic and layout are complete, I’ll need the standard fabrication package: • Gerber and drill files • Read-me with stack-up and cop...

I am looking for an experienced Mechanical / Fire Protection Engineer to perform a Smoke Extraction System Simulation for a building project. The objective is to simulate and evaluate the performance of the smoke exhaust system under fire conditions to ensure compliance with applicable fire safety standards. Scope of work Perform CFD simulation (e.g., using ANSYS Fluent, PyroSim, FDS, or equivalent software) Simulate fire scenarios based on assumed fire load and location Analyze smoke layer height, temperature distribution, visibility, and smoke spread Evaluate effectiveness of smoke extraction fans and air replacement strategy Verify system performance against relevant codes (NFPA / SFPE / local authority requirements) Provide recommendations if system performance is insufficien...

I’m working through the combinational-circuits portion of my digital design course and need hands-on support to design and fully implement multiplexers and demultiplexers. The goal is to move from logic-level concepts all the way to a working circuit that can be demonstrated in the lab. Here is what I’d like from you: • A clear derivation of the truth tables, Boolean expressions, and any Karnaugh-map (or equivalent) minimisation that leads to the final gate-level schematic. • An HDL version of the same circuit (Verilog or VHDL—whichever you prefer) that compiles cleanly and is ready for simulation. • Simulation results that verify correct operation for every input combination; ModelSim, Vivado, Quartus, or Logisim waveforms are all acceptable. &bull...

I want help building a simple zigbee device to use as a smart thermostat. its using a esp c6 super mini, screen, 2 buttons and a presence sensor. I have tested all the wiring and all works and got it showing on the ESP. The part i want, is to turn it into a Device, that when you connect it to Home assistant through Zigbee. it shows on the UI of Home assistant boxes you can fill in. One for Room Temp sensor (external sensor so you enter a device ID to read the state) One for Boiler ID (to read if the Boiler is currenttly on or off and show a icon on screen to show its state) and one to enter the Smart TRV device id, so what temp i set on the Thermostat it then updates it to the TRV. And to give the Presence Sensor a Device ID, so i can use it to set Automations in Home assistant manual...

我正在开发一款带有智能 LED 的硬件模组，主控ESP32，需要一位经验扎实的硬件工程师协助完成从原理图到 PCB 连接图的设计。核心需求如下： • 智能 LED 电路：请为多颗可寻址 LED 设计驱动与电源部分，确保亮度与色彩控制稳定，并预留固件升级和热管理方案的接口。 • 无线通信接口：电路板需同时支持 Wi-Fi 与蓝牙，方便后期通过手机 App 或云端进行调光与状态监测。 • PCB 设计：输出完整的原理图、布线文件（Altium Designer 或 KiCad 均可）、Gerber、BOM 以及关键布线规范说明，力求尺寸紧凑、EMI 控制良好。 • 生产可行性：器件选型应以量产常用料为主，并在文档中标明替代料号。 • 交付物： 1. 原理图（PDF + 源文件） 2. PCB Layout（源文件 + Gerber） 3. BOM 与简要成本预估 4. 设计说明书（含测试要点与校准建议） 如有成功设计智能灯带、氛围灯或类似消费电子产品的经验，请在回复中简述项目要点与所用工具版本。我会根据方案完整度与以往案例选择合作。

We are looking for an experienced IoT/ESP32 developer to assist with hardware connections and configuration for a Weather Monitoring System. We already have the hardware components available. We need guidance and support specifically for: • Proper sensor wiring with ESP32 • Power management guidance • Basic testing to ensure correct readings This is not a full development project — the primary focus is on hardware integration and correct connections. ⸻ Hardware Components: • ESP32 • BMP280 (Pressure + Altitude) • DHT11 (Temperature + Humidity) • MQ135 (Air Quality) • Rain Sensor ⸻ Scope of Work: • Guide on wiring setup • Assist in verifying sensor readings • Help troubleshoot if readings are incorrect • Sug...

Project Overview We are building a V1 industrial ESP32-S3 pulse controller for self-service car wash and vacuum stations. The device receives paid commands from a backend (MQTTS/HTTPS), and generates deterministic “coin pulses” into existing industrial controllers. This is not a hobby prototype. It is a field-deployed V1 pilot that must remain stable for years in harsh environments. Operating Environment • Outdoor installation (freeze/heat cycles) • Electrical noise: motors, pumps, inductive loads, relays/contactors • Expected ambient: −30°C to +40°C (design margin required) • Inside sealed IP enclosure can rise due to self-heating (design for up to ~+70°C internal with reasonable margin) • Humidity / condensation risk (design ...

I’m ready to move from rough sketches to a fully-specified electrical design for my new build and need a professional set of documents I can hand straight to the contractor and the local authority. The scope is the entire property: living areas, kitchen and bathrooms, all bedrooms, the utility room, a small studio, the loft conversion, plus outdoor circuits for external lighting and cabling that will feed two sheds/outbuildings. The final package must spell out circuit counts and loading, breaker and RCD selection, cable sizing, earthing and bonding details, and clearly show switch, socket and lighting points on coordinated floor plans. A single-line diagram and a board schedule are essential so the installer can see at a glance how everything ties together. PDF is fine for review...

I am making an AI Necklace. Please watch this video: I need a PCB Board Engineer to review this PCB board that we made and make sure: 1. Here is the PCB board + Gerber files that we already made. I need you to review it and make it better. Make it heavy-duty and usable, and make sure all the parts are available from JLCPCB: 2. I need you to look at and study this blueprint that I made (read everything on it): 3. I need you to get it ordered — go to with our account and get it ordered. 4. I need you to use open-source firmware or AI to program the firmware so it works with my app developers. I already have an app development team; I need someone to develop the firmware to work with my app developers. My app development team is in India. This contest is for PCB board improve...