电路设计 Jobs

Peace be upon you. I want someone to explain to me this operational amplifier circuit, which is the op-amp 741. I want a person who can explain it to me fully and help me implement it practically, someone with experience in explaining. Note: I want the teacher to know Arabic because I do not know English.

We are seeking an experienced technical writer with a solid background in electronics to update and improve the instructional documentation for our DIY Bluetooth Speaker Kit. The kits, used in schools and STEM programs, include pre-assembled circuit boards and require basic soldering skills to assemble. The documentation must support both the electronics assembly process and provide guidance for student customization. Responsibilities include: - Revising existing instructions for clarity, especially for beginner-level enthusiasts. - Simplifying technical explanations to be accessible for Year 10 students. - Updating the Bill of Materials (BOM) with precise detail. - Enhancing wiring diagrams with clear labels suited for basic soldering practices. - Including step-by-step visuals or illu...

Necesito integrar cancelación de ruido activa (ANC) en mis protectores auditivos 3M PELTOR X2, pensados para un entorno industrial. El objetivo es que el nivel de ANC pueda regularse mediante un control manual fácilmente accesible en el propio casco y que todo el sistema funcione con baterías recargables para evitar el uso de pilas desechables. Busco a alguien con sólida experiencia en electrónica de audio que pueda: • Diseñar el esquema electrónico y la PCB necesaria para añadir micrófonos, etapa de procesamiento y amplificación. • Incorporar un potenciómetro o selector físico que permita subir o bajar la intensidad de cancelación. • Prototipar y probar el sistema directamente so...

Ho bisogno di una scheda elettronica su misura che gestisca esclusivamente sensori di movimento installati all’interno di un espositore. L’applicazione è quindi indoor: vorrei un circuito compatto, a basso consumo e in grado di dialogare in modo stabile con i sensori IR/PIR (o tecnologia analoga, se più indicata). Oltre al dimensionamento elettrico, mi interessa che vengano previsti i connettori giusti per un cablaggio rapido dentro la struttura espositiva e che l’alimentazione sia compatibile con i 5-12 V già presenti nello stand. Non ho vincoli sul microcontrollore: va bene qualsiasi soluzione diffusa e facilmente reperibile, purché la programmazione sia semplice da aggiornare in caso di future modifiche logiche. Deliverable richiesti &bu...

I need an experienced electrical engineer to troubleshoot power systems for both commercial and residential properties. We are experiencing: - Frequent outages - Voltage fluctuations - Overloading circuits Ideal skills and experience: - Strong background in power systems - Expertise in diagnosing and resolving electrical issues - Experience with both commercial and residential electrical systems - Relevant certifications and licenses Please provide a detailed plan and timeline for the troubleshooting process.

I need a clear and professionally drafted electrical single-line diagram based on the electrical load list along with safety features that shows how power will be distributed throughout a small-scale gas plant facility. The drawing must follow the NEC (National Electrical Code) so that it can be submitted directly to our local authority for review and later handed to the construction team without additional rework. Scope of work – Capture the complete power distribution path from the utility tie-in through to all downstream loads, including metering points and breaker information. – Use standard electrical symbology and layer naming so I can easily integrate the file into our master AutoCAD set. A clean PDF export is also required for circulation.

Ich möchte mit dem „BBC micro:bit mit Kitronik Inventor’s Kit“ zwei kleine Experimente umsetzen und suche dafür eine komplette Dokumentation in Video-Form: 1. Aufgabe A – Sonnen-Ventilator • Bei Helligkeit soll ein Ventilator anlaufen, bei Dunkelheit stoppt er. 2. Aufgabe B – Taster-Licht • Drücke ich Taste A, geht eine LED an und schaltet sich nach exakt 2 Sekunden wieder aus. Lieferumfang, den ich von dir erwarte • Ein durchgängiges Video-Tutorial (Schritt für Schritt, klar erkennbar gefilmt) vom Aufbauen auf dem Breadboard bis zum Testen der beiden Schaltungen. • Mindestens drei scharfe Fotos der fertigen Verdrahtung aus unterschiedlichen Winkeln. • Eine kurze, anfängerfreundliche Er...

For my current university project I have to build a compact PCB whose only job is to collect data from several temperature sensors and route those readings to the rest of my prototype through simple wired connectors. Everything must be laid out and modelled inside Fusion 360, right down to the housing that will protect the board once it is fabricated. Here is what I need from you: • Create the full schematic and board layout in Fusion 360’s electronics workspace, optimised for straightforward sensor-integration and robust wired headers. • Export clean Gerber/Drill files plus the native Fusion 360 design so I can iterate later. • Model a 3-D printable enclosure in the same project file, dimensioned precisely to the finished PCB, with openings for the temperature-...

Project Brief: Stealth-Modified Automatic Parking Disc (Certified for Public Road Use in Germany) Project Goal: I want to technically modify a certified electronic parking disc approved for use in Germany (must have an official certification number and ECE approval), so that it continues to automatically update the displayed parking time even after the vehicle has been parked. This modification must be invisible and undetectable from the outside, meaning the device must look and behave like the original product to any observer or parking enforcement officer. Background: Standard electronic parking discs are designed to detect when a vehicle is turned off and then freeze the display at the next permissible half-hour mark. This allows parking enforcement to determine how long the car has b...

I need a clean, professional three-line diagram for a commercial distribution board that will use a 600 A main breaker feeding two 400 A MCCB outgoing ways. The drawing must be suitable for consultant review and contractor installation, so accuracy and proper notation are critical. You must understand australian as standard or dont apply Please integrate metering and monitoring points for the incomer and both feeders, showing CT placement, meter wiring and any auxiliary contacts clearly. Conform to standard commercial practices for breaker symbols, cable sizing notation, earthing and protective device labelling. I will supply the basic load schedule; you return: • A CAD source file (AutoCAD or compatible) • A high-resolution PDF ready for submittal • A brief leg...

Mohammed Hamed I am a Master’s researcher working on a GaN-based Current Source Inverter (CSI) for photovoltaic systems. I already have a working SVM control model in MATLAB/Simulink and a partial inverter structure. I am looking for a highly experienced MATLAB/Simulink Power Electronics engineer to professionally upgrade and restructure my model into a full physical Simulink/Simscape CSI system suitable for IEEE-level academic research. Scope of Work: • Convert inverter power stage into physical transistor-based Simscape models (GaN / SiC) • Integrate existing SVM control algorithm • Implement realistic DC-link current source and EMI-aware switching network • Verify losses, stress, and harmonic performance

I'd like to create a schematic and PCB layout that I can use to print from a photo I have. The layout is based on an ATmega and an ESP32, along with a servo connected to the ATmega. I'd like a guide on how to create a schematic file that I can modify and use in the future, not just the photos I have.

I maintain a fleet of mission-critical electronic control boards that must run flawlessly around the clock. Although the hardware is operational, I want to squeeze every last drop of performance out of it and harden the supporting security stack. Your focus will be on two fronts that matter most right now: • Bench-testing the optocouplers and comparators on the boards, then fine-tuning or replacing any part that introduces noise, latency, or inconsistent thresholds. RS-485 paths are already stable, so your insights should drill straight into these analogue front-end components. • Re-creating my SOC lab scenarios, walking through the logs, alerts, and incident chains, and flagging bottlenecks or mis-tuned rules that slow response time. Packet captures, SIEM exports, and a fu...

I’m updating the lighting throughout my house and need a clear, well-thought-out plan that focuses on functional use. The scope covers the living room, kitchen, and all bedrooms. Living Room I want this space to feel bright and lively, so the layout should balance general illumination with task and accent layers that keep the room energetic without glare. Kitchen Function is everything here—ample task lighting for prep areas, clear illumination over the island and counters, plus practical switching zones so cooking never feels shadowed or uneven. Bedrooms Comfort matters, but usability comes first. Think reading-friendly bedside levels, straightforward switching, and a calm overall balance that still lets the occupants see clearly when needed. Deliverables • Ro...

I’m putting together a small interface that lets a 5 V logic line drive a 12 V DC mechanical relay while keeping the control electronics completely isolated from the field wiring. My plan is to repurpose an off-the-shelf two-channel relay module for the load side and pair it with a standard optocoupler breakout on the control side; you can choose whichever optocoupler best meets the brief as long as it fits the isolation goal. What I need from you is a concise, ready-to-build circuit design: • A clear schematic showing the 5 V input network, the optocoupler stage, any necessary current-limiting or pull-down components, fly-back diode protection for the 12 V coil, and the wiring to the relay board. • A bill of materials with exact part numbers so I can order everything imm...

I’m building a wearable exoskeleton and need a dedicated PCB that brings all core electronics onto one compact board. The board must integrate: • Microcontroller • DC-DC converter • LDO regulator • IMU • Operational Amplifiers • JTAG header • All required connectors for power, sensors, and external actuators Scope of work 1. Schematic capture with component selection that balances size, efficiency, and heat dissipation. 2. PCB layout optimized for a tight wearable form factor—minimal footprint, clear signal integrity, and robust grounding. 3. Generation of manufacturing deliverables: Gerber files, assembly drawings, pick-and-place files, and a complete BOM. 4. Design review iteration to address any EMI/EMC or routing fe...

I need a clean, professional three-line diagram for a commercial distribution board that will use a 600 A main breaker feeding two 400 A MCCB outgoing ways. The drawing must be suitable for consultant review and contractor installation, so accuracy and proper notation are critical. Please integrate metering and monitoring points for the incomer and both feeders, showing CT placement, meter wiring and any auxiliary contacts clearly. Conform to standard commercial practices for breaker symbols, cable sizing notation, earthing and protective device labelling. I will supply the basic load schedule; you return: • A CAD source file (AutoCAD or compatible) • A high-resolution PDF ready for submittal • A brief legend explaining any non-standard symbols used If you nor...

Ich habe bereits einen funktions­tüchtigen Prototypen auf Basis eines ESP32-WROOM-32 aufgebaut, stoße jedoch bei der Fein- und Serien­entwicklung an meine Grenzen. Ich suche deshalb Unterstützung, die Hard- und Software gleichermaßen abdeckt, um das Gerät für Trainings­puppen von Einsatzkräften zur Marktreife zu bringen. Was das System künftig zuverlässig leisten soll: • Audio ausgabe – wahlweise vorab gespeicherte oder per Funk übertragene Signale • Wärme­abstrahlung, damit eine Wärmebild­kamera die „Person“ erkennt • Bewegungs- und Geräusch­erkennung zur Interaktion mit Rettungs­kräften • Akkubetrieb mit intelligenter Energie­verwaltung (min...

I need a compact, production-ready PCB that reliably converts an EDP 1.2 video stream into a MIPI CSI-2 output so I can interface an existing embedded panel with a camera-centric SoC. The job is purely about signal conversion; no additional processing or scaling is required. The core of the work is selecting a proven EDP-to-CSI bridge IC, building a clean high-speed schematic around it, and laying out a board that respects all impedance and length-matching rules for both the EDP and CSI-2 differential pairs. Please keep the stack-up simple enough for standard 4-layer manufacturing while still meeting the 100 Ω/90 Ω requirements. To speed integration on my side I also need the power-tree designed, the necessary reference clocks routed, and all test points clearly labelled fo...

I need help setting up two Nema 17 stepper motors to be controlled remotely via two ESP32 boards. One board will be in the remote and the other in the receiver. Requirements: - Manual control of stepper motors - Input commands using an analog joystick Ideal Skills and Experience: - Experience with ESP32 and stepper motors - Familiarity with joystick integration - Strong knowledge of manual control systems Please provide a detailed plan and relevant experience in your bid.

I already have the full Bill of Materials and a set of clear reference photos; what I still need is a production-ready PCB layout that ties everything together. Your task is to handle both the component placement and the complete routing of a balanced audio driver board that runs from a single 5 V input and generates ±12 V rails internally. There are no fixed dimensions, so you can choose whatever outline best supports clean signal paths and sensible power-ground separation. The only mandatory hardware interface is XLR—please keep the footprint orientation practical for panel mounting. Preferred deliverables • Editable design files in KiCad, Altium,—or another mainstream tool that supports Gerber export • Gerber, drill, pick-and-place, and centroid files re...

I have an existing ATMS PCB design with current dimensions of 120 mm (L) × 55.55 mm (W). I am seeking an experienced PCB layout designer to reduce the overall board size by up to 20 mm in both length and width through layout optimization. Scope of Work / Requirements: * The schematic must remain unchanged. * No component replacement, modification, or value changes are allowed. * Only PCB layout optimization and placement/routing improvements are permitted. * Electrical functionality must remain 100% identical to the existing design.

I’m looking for an experienced PCB design engineer to create a compact PCB that integrates LTE and GPS functionalities in a single module. The design must include onboard antennas for both LTE and GPS, a charging circuit, and debugging options. All other design and component details will be discussed over chat. --- Functional Features (Antenna Design Requirements): The PCB should include onboard antennas for both LTE and GPS, similar to the integrated antenna design used in ESP32 modules. Antennas must be PCB-etched or chip-type, without external connectors. Proper RF impedance matching (50Ω) and matching networks should be implemented for both antennas. Ensure antenna isolation, ground clearance, and tuning for optimal LTE and GPS signal performance. Include antenna la...

I am assembling a pool of recently-graduated electrical engineers from Pakistan who can jump straight into hands-on circuit design, MATLAB/Simulink modelling, and clear, publication-ready report writing. Day-to-day work will range from breadboard-level prototyping to full simulation and verification, so the stronger your foundations in analogue and digital design the better. The tasks you’ll tackle typically start with a concept sketched in Proteus or Multisim, move into schematic and PCB work in Altium, and finish on the bench or in a virtual lab via LabVIEW or TinkerCAD. Microcontroller and embedded targets rotate between Arduino-based boards, Raspberry Pi modules, and mid-range FPGAs, so comfort switching among those platforms is essential. Core expectations • Design or r...

45w Intelligent dual port charger

I need a miniature sine-wave transmitter board. I will supply the exact antenna footprint and the precise target frequency (it will be somewhere below 100hz, specified down to the decimal). Your task is to design a PCB smaller than 2 cm × 2 cm that generates a clean, low-distortion sine wave, feeds it to the antenna, and runs for at least one month on a single CR2032 coin cell. It has step sweep formula Long-term frequency stability, minimal harmonic content, and ultra-low power consumption are critical. Feel free to use discrete components, a low-power MCU with DAC, a numerically controlled oscillator, or any other architecture that can hit the spec while staying inside the tight footprint and power envelope. Deliverables • Complete schematic and PCB layout (KiCad, Altium...

Support / Service Technician . I am setting up a three-month trial run and need a reliable SMD technician to keep everything running smoothly on a part-time basis (about 5 to 8 hours per week, with some flexibility around peak periods). You will be supplied stock and trained for first level service and exchange , latter if this works you will be trained for , hands-on with Soldering and assembly of fine-pitch SMD components, diagnosing boards for Troubleshooting and repair when faults appear, and carrying out Quality control checks before shipping. You do not need to be an certified engineer to apply , we we seek people who are reliable and can work with , if you have worked in mobile phone technology and repair , you should apply I also rely on accurate Stock management of parts...

I'm looking for an experienced Arduino programmer to set up a project on an Arduino Nano. Requirements: - 2 PWM outputs - 200Hz frequency - 0-10 second ramp-up time - Up to 2 amps per channel - Triggered by a manual switch - Outputs to control a coil on a hydraulic valve Ideal Skills and Experience: - Proficiency with Arduino programming, especially with PWM control - Experience working with Arduino Nano - Knowledge of hydraulic systems and valves - Ability to implement adjustable ramp-up times Please provide your approach and relevant experience.

I have an industrial-scale CO₂ subcritical cooling plant that will be managed by an Eliwell controller (without extenssions modules) , and I need a specialist who can choose a few controller models which would fit this system. I want to use 8DI(digital inputs), 5DO(digital outputs), 2AO(analog outputs for FI control), and 3AI(analog inputs). I attached file hand made hydraulic diagram. I need to control two "satellites": LT1 SL and LT2 SL. There are to frequency inverters: FI1-control M1 compressor, FI2-control M3 compressor in different "satellites". I need Eliwels models manuals, in which must marked text why this suitable for my CO₂ subcritical cooling plant

I already have a fully functioning ESP32-based sensor board in production, but the next revision needs to be tougher, safer and ready for the European market. Your task is to take my existing schematic and layout files, integrate solid over-voltage, ESD and short-circuit protection, and hand back a design that can pass CE. Beyond the circuitry changes, I also need a clear plan for functionality and environmental testing. Tell me how you’ll prove the new protections work, outline any test fixtures you expect to build, and call out components that may have long lead times or special sourcing considerations. To keep everything concrete, here’s what I expect to receive: • Updated schematic, PCB layout and Gerber/ODB++ files • Revised BOM highlighting any new protection...

I'm looking for a skilled hardware engineer with firmware experience to design a control system for a domestic heating product. Key Responsibilities: - Design microcontroller and power supply components - Develop basic control logic firmware Ideal Skills and Experience: - Expertise in microcontroller and power supply design - Firmware development proficiency, especially in basic control logic - Experience in temperature control systems is a plus

Necesito plasmar en una sola placa todo el sistema de control para seis tiras LED RGBW independientes basadas en el driver 2415F (protocolo de 2 hilos: Data + Clock). La idea es utilizar el módulo WT32-ETH01 —un ESP32 con Ethernet integrado— como cerebro de la solución, de modo que pueda gestionarse vía red local. Busco a alguien con experiencia intermedia demostrable en diseño electrónico y creación de PCBs que pueda: • Diseñar el esquema eléctrico incorporando el WT32-ETH01, las seis salidas de señal (Data y Clock por tira), la etapa de potencia necesaria para cada canal RGBW y la circuitería de protección. • Rutear la PCB procurando buena distribución de alimentación y se...

We are seeking an experienced Hardware Development Engineer to lead the end-to-end hardware development of a consumer-grade embedded system. The role involves system-level architecture, component selection, schematic design, PCB layout, and hardware validation in collaboration with the firmware engineer. The engineer must strictly adhere to the milestone plan and deliverables outlined below. Key Responsibilities: - System-level hardware architecture and design freeze. - Component selection (MCU/SoC, power ICs, storage interfaces, wireless modules). - Schematic design and PCB layout (high-speed + mixed-signal, EMI-aware). - Power integrity, grounding, shielding, and DFM/DFA compliance. - Prototype fabrication support and manufacturer Q&A. - Hardware bring-up support and validation with...

Construction plans for my new single-family house are underway. I need a set of electrical drawings and schedules that show every outlet, switch, fixture, circuit run, fire alarms, windows/doors sensors, surveillance cameras, great room audio wiring and breaker size coordinated with the architectural plan. Priority spaces – Kitchen, Living room, Bedrooms must be wired. – A dedicated 60 amp circuit for an electric-car charger in the garage factored into load calculations. Please base the design on current NEC standards, include a panel schedule, load summary, and any required AFCI/GFCI notes. I can supply the PDF or DWG floor plans; final deliverables should return in matching CAD (DWG) and printable PDF formats. Send one of your new house electrical layout plan drawing w...

Freelance Hardware Engineer – Altium PCB Design Review (Remote Access) We have an existing Pulse Converter PCB designed using Altium Designer and are looking for an experienced freelance hardware / PCB design engineer to perform a technical design review. The work will be done via remote access to our computer (AnyDesk / TeamViewer). Design files will not be shared. Detailed circuit functionality and design context will be explained after mutual agreement and confidentiality alignment. Scope of Work: Review the schematic and PCB layout in Altium Designer and identify potential design issues, risks, and improvement points, including but not limited to: Power input and regulation (wide-range DC input) Relay driver circuits Optocoupler-based pulse input circuits MCU (ESP32 or sim...

PCB Design Review Required (ESP32-S3 Based Board) I am looking for an experienced electronics / hardware engineer to review my PCB design and provide detailed feedback. Scope of Review: Schematic correctness PCB layout review (top & bottom layers) Power supply & grounding ESP32-S3 pin usage & constraints Signal integrity & trace routing Decoupling capacitors & pull-ups SPI / I2C / SD card connections USB / Type-C wiring (if applicable) Common mistakes that could cause boot, noise, or stability issues Manufacturing & assembly readiness Files Provided: Schematic (PDF) PCB layout images Gerber files (ZIP) Component list (if needed) Expected Output: Written review with clear points Highlighted issues (critical / medium / minor) Suggestions for corrections & impro...

I need a complete PCB solution for a three-way passive audio crossover. The board must accommodate inductors, capacitors and resistors only, route the high-, mid- and low-frequency paths cleanly, and be ready for immediate manufacture. Here is what I expect from you: • Translate my schematic (or, if you prefer, verify and optimise it first) into a neat, single-sided or double-sided layout that respects low-noise analogue practices and keeps coil coupling to a minimum. • Produce all standard fabrication files—Gerbers, drill files, pick-and-place data and a clear silk legend—and a BOM with part numbers that are available from major suppliers. • Arrange or guide a short prototype run so I receive finished boards I can test in my speaker cabinet. I’m fl...

I’m building a dedicated controller board for an industrial-grade machine and need a complete motherboard design that brings together three essentials: an ARM processor at its core, LPDDR4 memory for fast, low-power operation, and a practical mix of input/output ports for real-time control and peripheral expansion. The job runs from architecture through to production-ready files. I’ll provide the functional block diagram and performance targets; you translate that into a routed, manufacturable PCB with a validated component stack. Signal-integrity considerations around the LPDDR4 lanes and high-speed ARM bus are critical, as is ensuring the I/O section can tolerate the electrical noise typical of factory floors. Deliverables • Altium (or KiCad) schematic and PCB la...

I’m launching a new vending concept and need a specialist who can design, build, and integrate the complete technology stack that makes a modern machine tick. The work spans everything from the brain-level firmware to the customer-facing interface, so I’m keen to collaborate with someone who has both hardware know-how and solid software chops. Core objectives • End-to-end system architecture: controller board selection, wiring diagrams, and firmware that drives motors, sensors, and cashless peripherals. • Flexible payment acceptance: contactless cards, mobile wallets, or other proven modules—guide me on the best mix for reliability and PCI compliance. • Real-time data: cloud-based inventory and health monitoring that lets me see stock levels, sale...