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I am looking for an experienced PCB designer to create a production-ready, compact PCB layout for a 4-channel ESP32-based smart switch board. To achieve a compact form factor and ensure safety, the design must utilize a 2-board stacked architecture. One board will handle the High Voltage (AC power and relays), and the other will handle the Low Voltage (ESP32 and touch controls). The two boards will connect vertically using exposed male/female header pins. Note: The schematics for both boards are already designed. Your task is to do the component placement, routing, and generate the final manufacturing files. Hardware Architecture & Components: The system is divided into two separate PCBs. PCB 1: Power & Switching Board (High Voltage) Power Supply: HLK-5M05 (AC to DC 5V Step-do...

I have the full schematic for working legacy PCB. I need it redesigned and modernised into a new board using current components, while keeping the original board size, mounting holes and connector positions. The old design uses PIC18F8722, FT232RL, TDA7465, video switching and RCA outputs. The new design should replace those with STM32 native USB, modern audio DSP/codec, protected coin inputs, modern power regulation, and custom firmware support. This is not an exact clone. It is a modern drop-in replacement using the original schematics as a reference. Key things :- Keep: * Board size: 168mm × 206mm * 6 mounting holes * USB-B position * Existing amp connectors * Mic input * Coin mech interface * IR receiver/service button * J8 motherboard audio input Remove: * RCA sockets * Vi...

I have a small home-automation module that needs a reliable touch interface, so the task is to engineer a 5 V circuit around the TTP223 that cleanly switches between high and low digital levels whenever it is touched. Precision in sensitivity and long-term stability matter more to me than squeezing out the very last microamp, yet the design should still sit comfortably in standby without wasting power. Key expectations • The sensor must tolerate normal household electrical noise without false triggering. • Output logic levels must be directly MCU-friendly (TTL/CMOS, active-high preferred). • Component count should stay minimal; surface-mount parts are fine. • Any necessary debounce or filtering should happen in hardware rather than firmware. Deliverables 1. ...

I’m developing a six-cell lithium battery management system and need the PCB laid out in EasyEDA Pro. Show me previous BMS or power-electronics, or similarly demanding boards you have designed—screenshots, photos of assembled units, or links to public EasyEDA projects are perfect. A quick note on the challenges you solved in those jobs will help me gauge fit. Timeline is firm: the first reviewable board must be ready within one month of contract start. Acceptance criteria • Editable EasyEDA Pro project file • Gerber, drill, and pick-and-place outputs • Complete BOM with manufacturer part numbers • PDF/PNG exports of schematic and board If you are confident with EasyEDA Pro and have a portfolio that proves it, I look forward to seeing your work.

PCB Layout & Routing Engineer Needed for CM4 4-USB Board - Schematic Verification Required - NDA Mandatory Description: We are looking for an experienced PCB design engineer to review, verify, complete, and improve the PCB layout/routing for an existing Raspberry Pi CM4-based 4-USB carrier board project. The project files are already available in an editable EDA project format. The selected freelancer must sign an NDA before receiving the design files. Scope of Work: Review and verify the existing schematic before layout/routing Check CM4 connections, USB hub/USB port section, power rails, grounding, reset/boot signals, connectors, ESD/protection, and decoupling Verify footprints, pin mapping, component placement, and net connections Complete or improve PCB placement and routing Fo...

I want to decide on the most appropriate semiconductor switch for a new switch-mode power supply design, with switching speed as the overriding priority. Although I initially considered a thyristor, I’m open to any device—MOSFET, IGBT, BJT or another alternative—that demonstrably outperforms the rest once the figures are on the table. Here’s what the work entails. First, analyse the SMPS topology and its expected operating conditions, then shortlist realistic candidates and justify the final choice in terms of rise/fall times, turn-on/turn-off losses, and any ancillary gate-drive or snubber requirements. Once the device is chosen, run a full simulation (LTspice, PSpice, SIMetrix, MATLAB Simulink or equivalent) that shows switching waveforms, efficiency trends over ...

Scope of Work & Deliverables 1. Circuit & Component Simulation Validate and simulate critical sub-circuits and component behaviors before moving to the layout stage (using LTspice, PSpice, or equivalent). Optimize the power delivery network (PDN), specifically the integration between the HLK Network module and the ESP32, ensuring proper noise filtering, decoupling, and voltage stability. 2. Schematic Review & Optimization Comprehensive audit of the existing schematic for signal integrity, protection circuits, and component ratings. Ensure proper implementation of hardware protection (e.g., TVS diodes, fuses, surge protection). 3. Thermal Simulation & Management (High Priority) Perform full Thermal Simulation (FEA/CFD) of the PCB and components under continuous 24/7 work...

I have a new consumer-electronics concept that needs a clean, single-layer PCB focused on reliable power-management. I’ll supply the functional block diagram and key electrical parameters; you translate this into a production-ready board. You’ll take the idea from schematic capture through to fabrication files, optimising track width, component placement, and thermal relief so the power stage remains cool and efficient. Standard tools such as Altium, KiCad, or Eagle are all fine—use whichever lets you work fastest without compromising quality. Deliverables I need at hand-off: • Editable schematic file • PCB layout file • Gerber, drill, and pick-and-place files ready for manufacturing • Complete, manufacturer-verified BOM with part numbers and f...

I have a run of industrial-grade PCBs that must be populated with both SMD and through-hole DIP parts—well over 500 individual components in total. Reliability is critical because the boards will sit at the heart of industrial equipment, so every joint needs to be crisp, void-free, and compliant with standard workmanship guidelines (IPC-A-610 or equivalent). Here is what I need from you: • Pick-and-place or precise hand placement of all SMD parts followed by reflow or hot-air soldering as appropriate • Clean, consistent hand-soldering of the DIP components, trimming leads flush afterward • Visual inspection under magnification and basic electrical continuity checks to confirm there are no bridges or cold joints • Return of the fully assembled boards, safely...

SKILLS:PCB Layout, EasyEDA, Electronics, Electrical Engineering, Embedded Systems, Circuit Design, Schematic Review, DFM, Gerber, BOM, Mixed-Signal Design DESCRIPTION: We need an experienced electronics / embedded hardware PCB designer for a confidential controller PCB project. The work must be done in EasyEDA. Important: full schematics, EasyEDA files, component details, connector mapping, mechanical constraints and architecture will NOT be shared publicly. Files will be shared only after NDA and IP Agreement are accepted. Project scope: 1. Review the existing schematics before PCB layout. 2. Identify schematic issues, missing values, footprint risks, connector or pin-mapping risks, power or grounding risks and manufacturing risks. 3. Prepare a correction list before PCB design starts....

I already have the full system architecture and every component selection locked in; what I need now is a seasoned PCB designer to turn that documentation into production-ready data using KiCad. The board will carry up to 10 A, so copper weight must be 2 oz or 3 oz and all plating details must follow the requirements outlined in the “” file I’ve shared. Because I specify the manufacturers for each part, the BOM has to reflect those exact sources with no substitutions. Apart from that, the focus is purely on translating my technical brief into clean, fabrication-ready output. Deliverables • KiCad schematic and PCB layout files • Optimised Gerber set for 2 oz / 3 oz copper traces • Excellon drill files for all through-holes • BOM and CPL that l...

I already have the full system architecture and every component selection locked in; what I need now is a seasoned PCB designer to turn that documentation into production-ready data using KiCad. The board will carry up to 10 A, so copper weight must be 2 oz or 3 oz and all plating details must follow the requirements outlined in the “” file I’ve shared. Because I specify the manufacturers for each part, the BOM has to reflect those exact sources with no substitutions. Apart from that, the focus is purely on translating my technical brief into clean, fabrication-ready output. Deliverables • KiCad schematic and PCB layout files • Optimised Gerber set for 2 oz / 3 oz copper traces • Excellon drill files for all through-holes • BOM and CPL that l...

Hello, I need a schematic and 2-layer PCB layout for an automotive-grade Multi-Port USB Charger box. It's a hardware-only project (no firmware/software). Key Goals: Target Manufacturing Cost: Under €15 per unit (PCBA) for a 100-unit run. Component Selection: Must use low-cost, highly integrated standard ICs (e.g., Injoinic, Southchip) from LCSC/JLCPCB. PCB Size: Approx. 65 x 40 mm or smaller (Open-Frame). Mounting: M3 screw holes in the corners with a strict 6mm diameter keep-out zone. Interfaces & Topology Input: 12V/24V DC + 1x SMD USB port (Data-Input from car radio). Outputs ($90^circ$ Shrouded JST PH 2.0 connectors): Port 1 & 2 (USB-A): Shared Buck-Regler (QC3.0 / Apple 2.4A, max. 24W total). Port 3 (USB-C): Shared USB-PD 3.0 / QC3.0 combo controller. Port 4 (USB...

note: this is MCU controlled at 3.3V, the controller is for both a single 12v gel battery or 1x 24V or 2x 12V gel batteries for 24V, the charge amps should not exceed 1A to the batteries, the input voltage is DC on the pin connector and can be 13.8V or 27.4V DC. the reason for the TPS5430DDAR is if we want to lower the voltage from top battery to balancer bottom battery at 13.8V with the TPS5430DDAR and mosfet networks. At start TPS5430DDAR disabled AO3401A Q1,Q10,Q11 disabled then the MCU does a voltage check on the plugged in BAT+, "separate circuit" , if <14V then 12V, if >24V then 24V system if 12V battery then GPA5 sets VSENSE to regulate to 13.8V, with the 1A limit controlled via LM358_C5252902 and 100mΩ shunt. enable ENA and Q1 if 24V batteries then GPA5 s...

ESP32 controller impedance matching multilayer design signal integrity analog signal design buck converter 24VDC input supply 5V and 3.3V power rails Relay outputs ADC and DAC interfaces Mixed-signal design 2-layer PCB

I’m looking for a qualified electrician who can step in and handle a range of possible tasks on-site. The exact scope is still flexible—I may need anything from fresh wiring and fixture installation to troubleshooting and repair, or even a full safety inspection and test—but the common thread is that everything must be completed to code, documented, and left fully operational. Here’s how I’d like to move forward: • We’ll start with a quick call or site visit so you can review the current setup, confirm the load requirements, and flag any compliance issues. • You’ll then outline the best-practice approach, materials you recommend, and an estimated timeline. • Once agreed, you carry out the work, provide a brief completion report...

For an R&D platform based on the SAM E54 Xplained PRO, we would like to make several (starting with 6) plug-in boards. The boards should be placed on one of the 3 headers of the Xplained. We have divided boards into 3 categories. Power supply, DCD converters (±48V or +40V or ±24V, 3V3, VREF 2.5, 1.25V, etc.). Driver OUTPUT User Interface and related For the first 4 boards (option 1 and 2), there are already schematics that can be used. These are already R&D PCBA files in use, but now we want to split them into partial boards as well. User Interface boards could be very simple, like a button, LED, header, screw terminal, etc. On request, new plug-in boards will need to be designed and created. All of this must be done with a program that is comp...

Our development team in Ahmedabad is moving into the next round of builds and I need clean, reliable power supply systems engineered from the ground up. The work ranges from choosing the right topology for each application through to producing fully documented schematics and layout drawings. Intermediate-level Microsoft Visio skills are essential because every diagram, layer and cross-reference will be handed straight to production and compliance for approval. You will interpret our electrical requirements, size components, run efficiency calculations, and capture every decision inside Visio so nothing is lost between design and assembly. Expect to collaborate with our in-house engineers by video call and chat; strong, clear communication will keep iterations fast and productive. Deliver...

I need a skilled technical writer who can turn raw electrical-engineering data, calculations, and design notes into clear, professionally structured engineering reports. The work involves explaining circuit designs, test results, and compliance considerations so that both engineers and non-technical stakeholders can act on the information without confusion. Scope • Receive my schematics, spreadsheets, and lab findings (PDF, Excel, or native simulation files). • Draft a full report that follows standard engineering-report conventions—objective, methodology, results, analysis, and conclusion. • Integrate IEEE terminology and reference relevant standards where needed. • Provide diagrams or tables when text alone cannot convey the concept. Acceptance crite...

We are developing a portable, handheld research instrument that combines two measurement modalities in a single pen-form device: 1. ELECTRICAL IMPEDANCE SPECTROSCOPY (EIS) 4-wire (tetrapolar) configuration. Frequency sweep 100mHz to 200kHz. Phase angle resolution ≤ 0.1°. Impedance range 10Ω to 10MΩ. Precision analog front-end IC (SPI interface). Shielded cable connector for external probe (Lemo or circular DIN, IP44). 2. OPTICAL SPECTROSCOPY Hamamatsu C12880MA MEMS spectrometer (SPI). Multi-wavelength LED driver: 4 channels (405 / 530 / 625 / 850 nm), sequential, PWM-controlled, current-regulated ±1%. SMA905 fiber optic connector. This project centres on a single-board solution that brings electrical impedance spectroscopy and optical spectroscopy togethe...

I need an analog circuit designed from the ground up and then laid out on a production-ready PCB for a consumer-electronics product. The finished board must operate as a single, unified control unit that fits cleanly inside a dedicated enclosure, so component placement and overall footprint matter as much as the schematic itself. I need an integrated control panel which houses two subsystems. One is water pumping line and the second is uv disinfection line. The circuit diagram for both subsystems will be provided . Kindly provide an integrated one and a pcb design for the same.

I am looking for LTSpice expert who can deliver simulation result per project. It is not one time project and if you are good candidate, we can cooperate for a long time. Also, we have to work on slack. Budget: 20$/task, 2 tasks/every day. Please share your LTSpice experience.

I have two new-build residences in Santa Rosa Beach, FL, each served by a 200 A main. I need a complete electrical layout and an itemised material estimate for both houses. The scope covers every rough-in and finish component except the decorative and exterior light fixtures, which I will purchase separately. Please include in your design all can lights, surface-mount lights, panels, breakers, branch wiring, boxes, receptacles, switches, and any other gear needed to deliver a code-compliant installation. I’m open to your recommendations on fixture brands and models that meet Florida energy requirements and blend well with coastal residential interiors. Because I’m installing the back boxes for telecom myself and will pull the structured cabling, you can leave those elements o...

I have already worked out the detailed mechanical layout for a very small control panel that sits inside a tubular enclosure. At its heart are two single-pole, eight-position rotary switches that will handle device control signals, a 1 A fuse block, a 1 A charging connector, a terminal block, and a USB-C port. Because space is tight the electronics must be split across two round boards, each only 1.25 in (≈ 32 mm) in diameter, with a short interconnect cable running between them and on to the rest of the assembly. What I need from you is the complete electrical design package so the boards can go straight to fabrication and assembly. The operating temperature peaks at 85 °C, so every component, connector, fuse holder and cable spec has to meet or exceed that rating. Deliverab...

I need the existing 433 MHz transmitter board—built around a GD32 MCU and RD RF module—re-laid without altering the RF front end or protocol so it continues to pair seamlessly with the current firmware of the receiver. The primary goal of this spin is better build quality, with particular attention to two areas: tighter precision in signal transmission and improved on-board heat management. The board still has to accept 12 – 24 V trailer-plug power (including load-dump and transient spikes) and regulate it cleanly down to 3.3 V for the MCU. The present protection and buck stage work, but component placement and thermal performance can be improved. Some components are locked in for compatibility, and I will supply you the short list during kickoff; everything else may be ...

I’m building a two-layer, donut-shaped PCB around ESP32-WROOM-32U. The outer diameter must not exceed 92 mm, the inner cut-out must remain at least 54 mm, leaving the 19 mm wide ring as our only real estate. Please respect the antenna keep-out zone on the outer edge of the module. Inside that narrow ring we still need to route: Quectel L80 GPS on UART, a MAX98357A audio amp over I²S, a DS3231 RTC on I²C, an SPI-driven MicroSD slot, and a single raw copper touch pad positioned on the perimeter. Power comes from a USB-C connector that sits on the edge; horizontal or vertical placement is fine as long as it follows the board outline and brings out both 5 V and a regulated 3.3 V rail. You may work in EasyEDA or KiCad—either format is acceptable. Please apply the board ...

我正在启动一款面向家庭环境的小型机器人项目，目前处于“初步需求”阶段，核心目标是让它能够自然地对话与陪伴家人。机器人需要具备稳定的语音识别能力，并在接收到指令后以三种方式做出回应：说话反馈、执行简单动作以及在屏幕上显示信息。 从技术角度来看，整机需要基于自主设计的 PCB，主控可采用 ARM 或 RISC-V 架构的嵌入式方案；还要集成基本环境传感器，并预留扩展接口以便后续添加更多模组。我希望你能主导硬件原理图与 PCB 设计，完成底层固件的快速原型，实现与传感器、语音麦阵列及小尺寸显示屏的驱动联调，并给出可靠的硬件测试方案。熟悉 AI 加速器或边缘计算模组的经验会非常加分，因为日后有计划将部分语音与推理任务本地化。 交付物需包括： • 机器人硬件整体架构图 • 可生产的 PCB Gerber 与 BOM • 嵌入式固件原型（含语音识别接口、动作与显示控制逻辑） • 简易测试工装与测试用例文档 • 开机演示视频或现场演示，证明设备能在家庭场景下完成对话并做出多模态回应 我期待与你一起把这位“家庭伙伴”从概念变成可握在手中的真实设备。

I already have working Arduino- and ESP32-based boards; what I need now is a reshape of the boards to a custom shape and should have little effect on the traces. you’ll focus on redrawing the board outline, adjusting keep-outs, and nudging traces so manufacturing remains trouble-free. I will supply the current schematic, board file, and a vector image of the geographic contour. You return updated design files (Altium or KiCad preferred, plus universal Gerbers) and a quick 3D render so I can visualize the new silhouette. Acceptance criteria: • Board outline matches the supplied country & continent vector within ±0.2 mm • No DRC errors at standard PCB thickness settings • Gerbers pass JLCPCB pre-check without modification If this sounds straightfo...

I am looking for an electrical engineer to design and build a functional 4G GPS tracker. The deliverables should include both the design documentation (schematics, diagrams, etc.) and a working prototype. The project must be completed within one month. Ideal skills include expertise in electrical engineering, GPS technology, and 4G communication systems.

Hi I will share the details with the shortlisted candidates. Thanks

I need a licensed electrician to replace an existing on/off switch in my shop with a single-gang rotary dimmer that is fully compatible with the LED fixtures already in place. The walls are drywall, wiring is standard 240 V UK ring, and there’s easy access to the back box, so the job should be straightforward for someone experienced. Your work includes supplying (or advising on) a quality rotary dimmer rated for LED loads, fitting it neatly, and testing that it dims the lights smoothly without flicker or buzz across the full range. Please tidy up after installation and verify that the faceplate sits flush and secure. Deliverables: • Rotary dimmer installed and wired correctly • Functional test from 0 % to 100 % brightness • Brief hand-over showing safe operation ...

I need a complete hardware design for an ESP32-C6 Dual CAN carrier board that will sit at the heart of a new communication device. The board must do three things: • Data logging – capture and store CAN messages locally. • Wireless communication – push that data over Wi-Fi 6 / BLE without relying on an external gateway. • Sensor integration – leave headers or footprints that let me tap additional lines and inject CAN messages from attached sensors. At this stage I am looking for a finished set of design files: schematic, clean PCB layout, BOM with part numbers that are actually in stock, and the usual Gerber/ODB++ outputs so my fabricator can run a quick prototype. You’re free to work in KiCad, Altium, or another mainstream tool as long as the fi...

I’m running a Teensy 4.1 that delivers a 0 – 3.3 V square wave at 80 kHz. For my signal-transmission stage I must boost that logic-level waveform to a clean +6 V amplitude, powered from an existing 13 V rail. Because the downstream chain mixes analog and digital circuitry, frequency stability, waveform accuracy, and strong noise immunity are all critical; edges need to stay sharp without ringing or overshoot, duty cycle must remain intact, and added jitter should be negligible. Here’s what I’d like from you: • A proven conversion topology (discrete driver, high-speed op-amp, gate driver, or any suitable approach) that takes 0 – 3.3 V in and produces a solid +6 V square wave at 80 kHz. • Schematic with full component values, part numbers, and a co...

We are developing a portable, handheld research instrument that combines two measurement modalities in a single pen-form device: 1. ELECTRICAL IMPEDANCE SPECTROSCOPY (EIS) 4-wire (tetrapolar) configuration. Frequency sweep 100mHz to 200kHz. Phase angle resolution ≤ 0.1°. Impedance range 10Ω to 10MΩ. Precision analog front-end IC (SPI interface). Shielded cable connector for external probe (Lemo or circular DIN, IP44). 2. OPTICAL SPECTROSCOPY Hamamatsu C12880MA MEMS spectrometer (SPI). Multi-wavelength LED driver: 4 channels (405 / 530 / 625 / 850 nm), sequential, PWM-controlled, current-regulated ±1%. SMA905 fiber optic connector. This project centres on a single-board solution that brings electrical impedance spectroscopy and optical spectroscopy togethe...

Diode/LED Tester. I will supply BOM and Layout. This is my first circuit card. - Derating: move to components that are derated (e.g., resistors at ≥60% rated dissipation when practical; capacitors with voltage margin).  - Capacitors: prefer electrolytic/solid polymer or MLCC X7R for stability; avoid low-stability dielectrics where long-term drift matters. Increase voltage rating (e.g., use 2× expected voltage where space/cost allow).  - Resistors: use metal-film or MELF where low tempco is important; increase power rating or spread dissipation (split resistor network) for hot spots.  - Semiconductors: choose devices with higher Vce/Vrrm margins, higher junction-to-ambient thermal resistance margins, and robust SOA for likely transient currents. Prefer packaged par...

I need a qualified service engineer to review electrical and fire services drawings for an office warehouse development project. This review is essential for obtaining development approval. Requirements: - Review of electrical systems: - Lighting - Emergency systems - Review of fire services: - Fire alarm systems - Smoke control systems Ideal Skills and Experience: - Expertise in electrical engineering, particularly in industrial settings - In-depth knowledge of fire safety systems and regulations - Experience with development approval processes - need to interface with Certifier Please provide relevant qualifications and experience in your bids.