Circuit design jobs

...5% على أصول متقلبة (مثل FET وHBAR)، عبر أمر Limit IOC لتجنب الانزلاق السعري. مؤشرات فنية متقدمة: OBI، CVD، MFI، فجوات القيمة العادلة (FVG)، تصحيحات فيبوناتشي، اختراقات بولينجر، وفلاتر إضافية (ATR ديناميكي، Volume Profile/VWAP، ارتباط مع BTC/ETH).فلاتر حماية من التلاعب بالسوق: كشف الجدران الوهمية (Spoofing) والحجم المصطنع (Wash-Trading). وحدة إدارة مخاطر مستقلة: Watchdog منفصل عن محرك التداول + Circuit Breaker يومي. تفريخ آلي لبوتات جديدة عند نمو المحفظة، مع فلترة شرعية صارمة (Spot فقط، لا عملات ميم أو ربوية). واجهة تحكم كاملة عبر Telegram Mini App باللغة العربية، مع حماية 2FA. شروط الدفع: المبلغ الكامل محجوز في Escrow المنصة قبل بدء العمل، ولا يُصرف إلا بعد نجاح فترة تجربة حية صارمة مدتها 30 يوماً بدون أي أعطال، بالإضافة إلى تقرير Backtesting فعلي (12 شهراً) وتدقيق كود مستقل من ط...

...flips, and the issue has become more frequent over the past week. I need someone who can come onsite, trace the wiring on that residential circuit, pinpoint whatever is causing the repeated trips, and confirm the safest long-term fix. Your job is to isolate the fault, explain what’s happening in plain language, and either correct it on the spot or give me a clear written plan—parts, labour and estimated time—so I can approve repairs immediately. A professional toolkit (multimeter, continuity tester, insulation resistance meter) and solid familiarity with domestic wiring regulations are essential. Deliverables: • On-site diagnostic of the affected circuit • Brief report outlining root cause and recommended remedy • Confirmation t...

...commission the complete electronic design for a 150-300 W pure-sine-wave solar inverter that will run from a 12.8 V / 100 Ah LiFePO4 pack and deliver 220 VAC. The unit must operate reliably indoors and outdoors, fit comfortably within a 10 × 20 cm footprint, and meet commercial-grade durability standards. Core electrical requirements • True sine-wave topology with ≥90 % efficiency under typical load • Clean 220 VAC output, THD ≤3 % at 150 W, full-power capability to 300 W • Input 12 VDC nominal, LiFePO4 profile charging via high-frequency PWM • Integrated SoC display or LEDs for real-time battery percentage and charge status Protection & safety Over-temperature shutdown, overload limiting, and fast-acting short-circuit protec...

...touch latching switch printed circuit board (PCB) with only 8 SMDs on it, copied for a obsolete device. I'm looking to get 100 of these made, possibly 200 depending on pricing. I can send the 6 component list and photos of the circuit board and a complete circuit board is this 2 sided. The active devices are a ATMEL TINY 13A (needs programming and a PA1CD (i think it's a zener diode, 4 resistors and 1 capacitor. On the decal side there is a small led that lights when latched. It needs to be copied exactly because this switch circuit gets glued into a recess in a plastic case with cutouts for the components so the board lays flat. I may not need the switch decal. Run on a 3.7VDC battery. Key Requirements: - Exact replication of the existing PCB ...

...am not certain whether any legacy code exists for these boards; you may be starting from a clean slate or refining half-finished firmware. Either way, I will supply the hardware, electrical schematics, and any reference data I can gather. You will advise on toolchains, microcontroller families and calibration workflows, then deliver: • Complete, compile-ready source code for each module • In-circuit flashing and test instructions • Brief documentation outlining calibration parameters and diagnostic commands Bench validation is fine at your end; road-test protocols can be agreed once bench results look solid. If you’ve previously tuned ignition timing, managed closed-loop lambda control or handled crank position decoding, that experience will be immedi...

We are Astragar, a cybersecurity and risk platform. We need one LinkedIn single-image ad creative designed in Adobe Illustrator, built on our existing brand system. This is a paid trial piece. If it goes well there is a run of further LinkedIn ad images, plus an onsite workshop design and a webinar design to follow. WHAT THE IMAGE HAS TO SAY One picture of the whole Astragar platform, with the headline idea: "See your cyber risk in dollars, not CVSS scores." Five capabilities, shown as one connected system rather than five separate boxes: 1. Sensitive data, valued. We discover sensitive data automatically, on a locally deployed platform, and put a financial value on it. 2. Vulnerabilities, prioritised. We rank vulnerabilities by the business value and sensitivi...

...building a proof-of-concept noise-reduction module destined for consumer-grade electronics. My priority is an electronic schematic that delivers two core capabilities: active noise cancellation and echo reduction. The circuit must be small enough to embed in another typical product that will be mentioned later on as the project develops. Here’s the flow I have in mind. First, we collaborate on the signal-processing topology—feed-forward, feedback, or hybrid—then translate it into a detailed schematic and PCB layout (Altium, KiCad, or your preferred EDA). Once the draft design is ready, I’ll need simulations or bench measurements that prove at least 20 dB attenuation in the 50 Hz–2 kHz band while holding latency under 10 ms; please include SPI...

...as the technical work behind it. I will handle all calculations, simulations, and data; what I need is an experienced engineer—or a writer who routinely prepares professional engineering documents—to help me shape that material into a clear, cohesive LaTeX manuscript. I have 2 separate reports to write. The topic of the first is programming and security-related. The second report is analogue circuit-based. As I said i will do all the technical work; I just need help putting these documents together. The submission for these reports is at the beginning of November and should be roughly 30 pages long. Scope of collaboration • Co-writing and detailed guidance: we will develop each paragraph together, ensuring terminology, logic flow, and depth of explanation ar...

We need 2 additional logos for our SoCal Premier Circuit events. We would like them to match the style and color palette of the logos you have already done for us. Orange County Bowl Pacific Coast Bowl We also need 2 additional logos for our NorCal Premier Circuit events. Again, we would like them to match the style and color palette of the logos you have already done for us. Gold Rush Challenge Sonoma Coast Classic

...ON/OFF Control PCB Design I am looking for an experienced Power Electronics / PCB Design Engineer to design a compact industrial power supply and control circuit that will work with our existing IoT device. Main Requirements - Input: 220–240V AC industrial supply - Provide stable DC power to our existing IoT device - IoT device will provide the control signal for Machine ON/OFF - Circuit must safely switch/control the industrial machine using an appropriate relay/contactor/SSR or other suitable solution - The machine load current will pass through or be controlled by the designed switching section - Proper isolation between high-voltage AC and low-voltage IoT electronics - Include necessary protection: fuse, surge protection, over-current/shor...

...Objective Create one permanent Master QR Code which opens the MP Escapes digital portal. The portal should be: * Mobile-first and responsive * Fast loading * Premium and visually attractive * Extremely easy to navigate * Suitable for international B2B travel professionals as well as travellers * Easy for our team to update in the future * Accessible without requiring an app download or login The design should follow the MP Escapes brand identity, preferably using a premium Black + Gold + White visual language. ⸻ HOME SCREEN The QR code should open directly to a Home Screen containing the MP Escapes logo and attractive Madhya Pradesh imagery. Suggested menu: EXPLORE MADHYA PRADESH DOWNLOAD TRAVEL RESOURCES DESTINATION INFORMATION PLAN YOUR JOURNEY IMPORTANT TRAVEL INF...

Project Overview I am looking for an experienced Embedded Systems / PCB Design Engineer to review, validate, and complete an ESP32-based Ethernet gateway project. The project is based on an ESP32-WROOM-32 module and LAN8720A Ethernet PHY and is intended to operate as an ESP-NOW to wired Ethernet/MQTT gateway. I will provide an existing project repository containing the current KiCad schematic, PCB layout, firmware, BOM, Gerber files, 3D models, and documentation. The goal is to have a professionally reviewed and production-ready design, with the firmware properly configured and tested. Existing Hardware The current design includes, among other components: * ESP32-WROOM-32 * LAN8720A Ethernet PHY * CH340C USB-to-UART interface * USB input * 3.3 V power regulation...

I am looking for an electronics engineer to design a small battery-powered IoT sensor PCB based on the ESP32-C3. The goal is to create a compact prototype PCB capable of monitoring environmental conditions and communicating wirelessly through Wi-Fi/Bluetooth. Main Requirements: The PCB should include the following: * ESP32-C3 module * BME280 temperature, humidity and pressure sensor * Ambient light sensor * Sound sensor/microphone input * 0.96" I2C OLED display * Li-ion battery connector * Li-ion battery charging circuit * USB-C connector for charging and power * 3.3 V voltage regulation * Power ON/OFF switch * User push button * Status LED * GPIO expansion header * Required protection and decoupling components Power The board will be powered by a single-cell Li-ion b...

My 12 kW r...so no municipal permit process is required. What I need from you: • Pull and terminate the four PV strings (MC4 to combiner if preferred, or directly to the inverter’s MPPT inputs). • Route wire in code-compliant EMT or PVC from roof to garage interior, with proper labeling, grounding, and over-current protection to meet the latest NEC guidelines. • Perform continuity, polarity, and open-circuit voltage checks before final energization, then commission the system so the inverter recognizes all strings. I have roof access, conduit stubs started, and all major hardware on site; you bring the wire, lugs, and test gear. If you’re comfortable with standard PV practices and Texas electrical code, this should be a quick wrap-up job. Let&rsqu...

I need a video for the home page of my website: Create a cinematic 12-15 second animation video. Begin with a dramatic deep-blue ocean wave rolling slowly toward the viewer. Bright whitewash and sea foam move naturally across the screen. As the wave breaks, the white foam gradually transforms into glowing circuit-board traces, electronic pathways, connectors, PCB components, displays, power modules, battery icons, and cable assemblies. Keep the motion smooth and premium, not overly futuristic or flashy. The electronics should appear to emerge organically from the wave, as if innovation is flowing through the water. Around 5–7 seconds, reveal the Kehoe Electronics logo and the headline: “Powering the Next Wave of Innovation” Then progressively introduce the key

...schematics, and layout work. The scope centres on two areas: • Power distribution systems – accurate single-line diagrams, cable sizing, panel schedules, short-circuit and voltage-drop studies. • Control systems – control panel layouts, I/O lists, and wiring diagrams that integrate smoothly with PLC hardware. I already have general corporate guidelines and typical drawings that outline preferred symbols, layer naming, and drafting conventions; you’ll refine and expand these into full construction-ready documents that comply with NEC/IEC and any site standards we identify together. Typical deliverables I’ll be looking for: 1. Updated design basis memorandum summarising assumptions and loads. 2. CAD drawings (DWG) with accompanyin...

I’m bringing in an external expert to tighten up a mixed-vendor environment that spans Cisco, Juniper, HPE/Aruba switching and a FortiGate firewall. Most of the day-to-day items run well, yet lingering issues around VLAN design, trunk consistency, OSPF versus static routes, and a few NAT quirks at the edge are starting to show. The single highest-value task is establishing a reliable Site-to-Site VPN between two offices so we can retire an aging MPLS circuit. Beyond that, I’d like you to review current firewall rules, clean up redundant objects, and confirm that inter-VLAN routing on the switch stacks lines up with our security zones. SolarWinds is in place for monitoring; if you see gaps in SNMP polling or alerting, feel free to tune those as you go. To keep ...

...for an electrical engineer / KNX specialist to prepare the complete execution documentation for a residential KNX/DALI installation. The installation itself will be carried out by a local electrician in Switzerland based on the plans and documentation we finalize together. The required scope is divided into three phases: Phase 1 – Design and Planning * Review the architectural plans and requirements * Review and finalize the electrical, KNX and DALI design * Finalize fuse box layout, protection devices and component locations * Finalize conduit and cable planning Phase 2 – Detailed Documentation * Prepare complete fuse box drawings * Prepare detailed 230 V, KNX, DALI and low-voltage wiring diagrams * Prepare conduit and cable schedules showing cable types, ...

PCB Design & Engineering for HydroNest RO Plant Controller 1. Project Objective We are developing a professional controller PCB for commercial/light-commercial RO water treatment plants under HydroNest India. The objective is to take our existing functional requirements, selected components/modules and control logic, and have an experienced electronics engineer design, optimize and finalize the complete electronic controller. We are not looking only for PCB layout work. The engineer should be capable of taking the requirements at a system level and developing the complete electrical design, schematic, component selection/optimization and production-ready PCB. ⸻ 2. What We Will Provide We will provide: * RO plant operating requirements and sequence * List of...

...need a compact PCB designed from a working schematic/netlist I already have. The prototype works on breadboard; I need a manufacturable SMD board. Core components: ESP8266 (MCU module) MLX90614 IR temperature sensor (I2C, TO-46 metal can package — through-hole) Waveshare 1.69" LCD module (SPI, header/FPC connection) 3.7V 400mAh Li-Po battery (JST-PH connector) TP4056-based charge/protection circuit P-MOSFET load switch on the sensor's power rail (GPIO-controlled), used to force a clean power-on reset of the sensor and avoid I2C bus lockups I2C pull-up resistors, decoupling caps, power switch, optional status LED Scope of work: Review and refine the schematic (netlist and BOM will be provided) in KiCad or EasyEDA — your call, please confirm. Select correc...

I have complete CAD drawings for a small tabletop dryer that combines a basic airflow system, a low-temperature heating element, and a simple timer circuit. The goal is to prove the concept, not to create a production-ready unit, so I’m looking for a pragmatic builder who can source readily available components from my preferred parts list and put together one clean, safely wired prototype. What I’ll hand over: • PDF and STEP drawings with dimensions, airflow path, and wiring diagram • A spreadsheet listing the off-the-shelf fan, cartridge heater, timer module, and enclosure parts I’d like to use (all stocked by major suppliers) What I need back: • A fully assembled, bench-tested prototype that runs for at least one hour without overheating &bu...

I need an experienced EPLAN engineer to develop a full set of electrical docu...and cross-references must be organised so the files are production-ready and easy to maintain. Deliverables • Complete EPLAN schematics (editable .elk / .zw1 files and PDF export) • Component list/Bill of Materials generated directly from the project • Wiring diagrams showing terminal numbering, cable cores, and connector pin-outs Acceptance criteria The project is complete once every circuit is validated by EPLAN’s error check, device and cable numbering are consistent, and the exported BOM matches the parts used in the drawings. If you are comfortable working exclusively in EPLAN for automotive control systems, please confirm your estimated turnaround time and any similar ...

...package. The scope covers the entire low-voltage network that will power our lighting, navigation equipment and communication systems. Here’s what I need from you: • A clear, ABYC-compliant schematic (PDF and editable CAD) showing wire runs, circuit protection, bus bars, switches and grounding. • A complete, itemised bill of materials with manufacturer part numbers, wire gauges, breaker sizes and recommended sources. • Installation notes that highlight any special considerations for salt-water environments and vibration on a planing hull. Your design should allow for future expansion (extra nav gear or auxiliary lighting) without major rewiring, and it must integrate cleanly with the engine’s 12 V alternator and a shore-power charger. Familiar...

I’m finalising the electrical systems design for a new residential development and need clear, professional guidance on the wiring layout. The rough architectural drawings are ready; what’s missing is a verified plan that maps every circuit logically, meets current code, and avoids costly re-work once construction begins. Here’s what I need from you: • A room-by-room wiring layout annotated on my PDF floor plans (AutoCAD or Revit exports are available if preferred). • Confirmation that conductor sizing, routing, junction box placement, and breaker assignments all comply with the latest residential standards in my jurisdiction. • A brief written rationale (one or two pages) explaining key design choices so I can communicate them con...

I’m building ...for a circular form factor with clear mounting points for wheels and battery. 3. BOM with manufacturer part numbers and availability notes. 4. Power system: safe lithium battery charging circuit (USB-C preferred) and protection. 5. Design files ready for fabrication plus an assembly drawing that shows component placement and wheel integration. Acceptance criteria • All nets pass ERC/DRC. • Gerbers import without errors at JLC or PCBWay. • ESP32 antenna keep-out and ground clearance follow datasheet guidelines. • Separate power domains for logic, motors, and LEDs tested in the design review. If you have prior work with ESP32 mobility gadgets or compact LED wearables, please mention it—seeing similar...

I need a 3D design for an electronics box to be 3D printed using ABS material. The box will house several components including a circuit board, batteries, connectors, a display, and buttons. Requirements: - The design should accommodate the specified components. - It must be assembly-friendly with screws. - Ideal skills: 3D modeling, experience with ABS, and design for 3D printing.

...bench-top reality on a new battery pack and I need an R&D hardware engineer who is equally comfortable with Battery Management Systems like Anker 737 & thermal control hardware. I’m looking someone with a hands-on specialist who can own the phase, turning those drawings into a working assembly that can survive abuse testing and provide clean, reliable data. Your day-to-day focus will be: • Circuit design for the BMS daughter-boards, including cell-balancing, current-sense, protection FETs and all supporting analog/digital interfaces. • Thermal analysis of the pack and its integrated cold-plate, using your calculations to specify sensors, heaters, interface materials and control loops before committing them to hardware. Once the schematics and the...

I need a detailed Appeal Index prepared for a matter in the Federal Circuit and Family Court. I already have the court-approved template, so your first step will be to work within that layout and observe the relevant filing rules and page-number conventions. Because I am still clarifying exactly which materials the Court will require, I’m looking for someone who understands the usual inclusions—pleadings, orders, affidavits, exhibits, transcript references—and can advise what should and should not make the final list. In short, you will: • Review my template and matter file. • Identify and organise the documents that properly belong in an Appeal Index. • Produce a clean, paginated draft in both Word and searchable PDF, ready for e-filing. ...

...PWM, current-limit circuit, or potentiometer. • Remain within the specified footprint and include straightforward mounting points so I can drop them straight into my assembly. • Operate continuously without excessive heat build-up or noticeable magnetic drift. the electromagnets cores are close to 1-3 width, 100mm height and 10mm depth. they need to fit within a arm (harness) . two magnets are curved and one is straight (going through the middle of a sphere) Deliverables • 3 fully wound and assembled electromagnets built to the agreed dimensions • Matching driver or control interface with wiring diagram and basic operating instructions • Short test report showing measured pull force at minimum, mid-range, and maximum settings • Source files...

Project Description I am looking for an experienced electronics and embedded systems specialist to help with the design and development of electronic projects. The project may involve circuit design, Arduino, ESP32, microcontrollers, PCB design, Proteus simulation, firmware development, troubleshooting, and testing. Requirements - Circuit and schematic design - Arduino / ESP32 development - Microcontroller programming - PCB design - Proteus simulation - Embedded systems and firmware - Electronics troubleshooting - Clear technical documentation The selected freelancer should be able to understand technical requirements, propose an efficient solution, develop the required hardware/software, and provide all necessary project files and docu...

I have a brand-new built-in dishwasher sitting in its box and I’m ready for a professional to slide it into the cabinet space, hook it up, and confirm that everything runs perfectly. The old unit has already been removed, so there’s no disposal work—just a straightforward installation. Both the dedicated 120 V electrical circuit and the existing hot-water supply/drain lines are already in place and up to code. What I need is an experienced installer to: • Level and secure the dishwasher within the enclosure • Connect water, drain, and power, respecting manufacturer clearances and anti-flood requirements • Run a full test cycle to check for leaks, proper drainage, and correct electrical operation • Provide a brief hand-over on any adjustm...

...device counts and wiring topology. Your task is to generate three items and place them into a clear, engineer-ready PDF: • Battery sizing calculations that prove the panel will operate through its required standby and alarm periods (backup duration is open—show your working so we can adjust easily). • Maximum allowable circuit / loop / network lengths based on the panel’s published current limits and conductor gauges. • End-to-end voltage-drop calculations for each circuit, referenced to the worst-case load. Each worksheet must reference the specific NFPA 72 clauses you apply, include formulas (not just final numbers), and cite all manufacturer data sheets you use. I will review the draft against our jurisdiction’s submittal checklis...

...Electronics Consultant — Remote Guidance for a Sensor Prototype We are building an analog sensing circuit and need an experienced engineer to guide us through it remotely. We do the bench work; you tell us what to do, what to measure, and how to interpret what we find. What you would actually do: Review our existing schematic and flag anything wrong or fragile Give us clear, specific instructions we can follow at the bench Tell us what to measure at each step and what reading indicates success When something does not work, help us isolate the cause rather than guess Improve our approach where you see a better way Must have: Good knowledge of Analog Circuit Design and real hands-on analog circuit experience Strong grasp of AC behaviour: resonance, r...

I am looking for a review of a rigid PCB which contains a diode, fuse, and a connector for a FPC cable, and a separate FPC Flex cable which can be soldered to the Fuse & Diode PCB. There is a short criteria which I can provide, but I am basically looking for a review before I manufacture. I have the files and am keen to have a quick turnaround. Experience with high temperature circuit is an requirement. Please ensure you can demonstrate experience in this area (175c)

The task is to design and document a practical way for me to verify the health of Epson XP-600 “smart” printheads outside the printer. My workflow as a service technician demands fast functional testing—specifically diode-mode and impedance checks—to catch heads that are in short circuit or otherwise in poor condition before I reinstall them in a customer machine. What I expect from you • A compact electronic tester (schematic, PCB Gerbers, bill of materials and firmware source) capable of: – Running a diode-mode sweep on every nozzle bank – Measuring impedance values and flagging readings that fall outside healthy ranges – Giving an immediate PASS / FAIL indication for short-circuit detection, ideally on ...

I need a skilled Public Relations freelancer to help increase my visibility as a speaker. I'm an 82-year-old recent doctorate graduate with an e-book on Amazon, seeking to establish myself as an expert and get on the paid speaker circuit, particularly with community organizations. Key tasks include: - Crafting and distributing press releases - Securing speaking engagements with community organizations - Promoting my e-book to bolster my credibility Ideal skills and experience: - Proven track record in PR - Strong connections with community organizations - Experience promoting authors and speakers

I need my existing electric cooktop taken out, set aside for me to dispose of later, and a new induction unit fitted in its place. The current wirin...the induction model according to best practice; I’m flexible on whether it ends up flush or slightly raised as long as it is secure, level, and looks purposeful. Afterward, power it up, confirm all zones heat correctly, and tidy the area so I can start cooking right away. Deliverables: • Remove old cooktop (leave on site for me) • Install and wire the new induction cooktop using existing circuit • Functionality test for every burner and control • Basic cleanup of the work surface and surrounding area If you have recent experience with induction installations and can schedule the job soon, I&...

I’m building a small home-electronics product that runs from a 2-cell Li-ion pack (8.4 V when full). I need a proven control circuit that automatically disconnects a 9 V wall adapter – routed through a TP5100 module – once the pack reaches 8.4 V, then reconnects it when the voltage falls back to roughly 7.2 V. The heart of the design will be a voltage-comparator stage. I’m fine with the classic LM393, but you may choose any pin-compatible or better device if it improves accuracy or power draw. The switching element can likewise be an N-MOSFET, P-MOSFET, or even a compact relay; I mainly care about low losses, no back-feeding into the adapter, and rock-solid hysteresis between OFF (8.4 V) and ON (≈7.2 V). What I need from you • Complete s...

...complete). This project is strictly for schematic audit, protection/sensor circuit integration, PDN electrical simulation, 4-layer PCB optimization, 3D CFD thermal validation, and generation of a zero-error production release package. --- SCOPE OF WORK & DELIVERABLES --- ■ Milestone 1: Schematic Audit, Protection Sub-circuits & Electrical/PDN Simulation ($20) 1. Schematic Audit & Component Engineering: • Complete audit of existing KiCad schematic for signal integrity, power stability, and component lifecycle (active MPNs only on DigiKey/Mouser/LCSC; no NRND/EOL). • Power Architecture: Optimize power sequencing across e-Fuse, dual buck converters (12V to 5V & 3.3V), and LDOs to eliminate ESP32 back-powering. 2. Peripheral & Circuit Integration:...

...walkthrough that leads to those values (including impedance considerations) • A brief frequency-response plot or SPICE simulation screenshot confirming the roll-off Keep the layout simple enough for through-hole assembly and aim for readily available E12 series parts. If you like working in LTspice, Multisim, or a similar tool, feel free—the files are welcome alongside a PDF or image of the final circuit....

...power-amplifier stage for a home audio setup that will accept a purely digital source (e.g., DAC board, streaming receiver) as its input. The job is to create the complete circuit from scratch—nothing to troubleshoot or modify—so all design choices are in your hands, provided they meet the following essentials: • Core device: single TDA2050 in class-AB configuration • Input: digital line-level signal coming from an external DAC (so any filtering or impedance matching you feel is appropriate should be included) • Output power: the typical 25–30 W into 4–8 Ω expected from the chip, with thermal protection and short-circuit safeguards fully implemented • Noise floor and THD figures suitable for hi-fi living-room ...

I need a compact boost-converter design built around the LM257 that will take an input anywhere between 3 V and 5 V and reliably produce 12 V. The main objective is simply to raise the voltage—efficiency tweaks are welcome, but only if they keep the 12 V output rock-solid. Please size and choose every supporting component, show the calculations that justify your values, and package everything so I can reproduce or tweak the design later. A quick simulation (LTspice, Proteus, or similar) or bench data that proves the circuit holds 12 V ±5 % across the full input range will close the loop. Deliverables • Annotated schematic (PDF + native CAD) • Bill of materials with readily available parts • Short design note covering formulas,...

...troubleshoot a consumer-grade device that is showing persistent battery-related problems. The unit fails to hold charge consistently and occasionally shuts down without warning, so I want a clear diagnosis of the underlying circuitry and a practical repair or redesign recommendation. Here is what I expect: • Bench-level testing of the power stage, charging circuit, and protection ICs • Identification of faulty components or design flaws causing the battery issue • A concise report summarising test procedures, measured results (voltage, current draw, ripple, thermal behaviour), root-cause analysis, and proposed corrective measures • Optional: firmware review if the fault points to power-management code interactions You may use oscilloscopes, mu...

I’m looking for a VLSI-savvy freelancer who can take a simple circuit concept and turn it into a clean, ready-to-fabricate design. The task is firmly in the “basic” range, so I don’t expect multi-million-gate SOC complexity—just a well-thought-out block that follows good layout and timing practices. Here’s what I need: • Capture the schematic from my written spec (a brief netlist and functional description will be supplied). • Produce a layout that meets foundry DRC/LVS rules; Cadence Virtuoso, Mentor, or an open-source alternative is fine as long as you state the PDK you’re comfortable with. • Supply simulation results that verify the target functionality and basic timing. SPICE, Spectre, or ngspice are all accept...

...bench-top reality on a new battery pack and I need an R&D hardware engineer who is equally comfortable with Battery Management Systems like Anker 737 & thermal control hardware. I’m looking someone with a hands-on specialist who can own the phase, turning those drawings into a working assembly that can survive abuse testing and provide clean, reliable data. Your day-to-day focus will be: • Circuit design for the BMS daughter-boards, including cell-balancing, current-sense, protection FETs and all supporting analog/digital interfaces. • Thermal analysis of the pack and its integrated cold-plate, using your calculations to specify sensors, heaters, interface materials and control loops before committing them to hardware. Once the schematics and t...

I'm looking for an experienced PCB designer to create a power supply circuit board for consumer electronics. The board will take a 24V input and provide 9V and 12V outputs using switching regulation. Key requirements: - 24V input, 9V and 12V outputs - Switching regulation only - Design for consumer electronics application 3 isolated and highly filtered 9v outputs 2 isolated and highly filtered 12v outputs design is to use recom dcdc isolated converters 9 volt channels 3.3amp out 12 volt channels 2.5 amp output Output jacks wired center negative polarity Ideal skills and experience: - Proficiency in PCB design software - Experience with switching power supply circuits - Background in consumer electronics power supply design Please include relevan...

...Inverter Design I am looking for an engineer or company that already has a **tested and working pure sine wave inverter design** available for sale or licensing. I am **not looking to develop a new inverter from scratch**. The design should preferably meet the following requirements: * 12V, 36V, 24V and 48V DC input * 120V / 220V AC output * 50/60 Hz * Low-frequency transformer based * Pure sine wave output * Approximately 1.5kW to 12kW continuous power * MOSFET based H-bridge * SPWM control * Battery charger / AC charging preferred * Automatic transfer between AC and inverter preferred * Short-circuit protection * Overload protection * Battery under-voltage and over-voltage protection * Over-temperature protection The package should include: * Complete...

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Hardware Prototype Design and Experimental Validation of SiC MOSFET-Based Modified Boost Converter Project Overview I am looking for an experienced Power Electronics / DC–DC Converter Hardware Engineer to design, develop, and experimentally validate a laboratory-scale prototype of a SiC MOSFET-based Modified Boost Converter. The main objective is to develop the converter hardware and obtain actual experimental waveforms using a digital storage oscilloscope (DSO). The measured hardware results should be compared with the theoretical calculations and MATLAB/PSIM simulation results. Required Work The selected freelancer will be responsible for: Designing the complete power circuit of the proposed Modified Boost Converter. Selecting appropriate SiC MOSFET, gate-...

...building a proof-of-concept noise-reduction module destined for consumer-grade electronics. My priority is an electronic schematic that delivers two core capabilities: active noise cancellation and echo reduction. The circuit must be small enough to embed in another typical product that will be mentioned later on as the project develops. Here’s the flow I have in mind. First, we collaborate on the signal-processing topology—feed-forward, feedback, or hybrid—then translate it into a detailed schematic and PCB layout (Altium, KiCad, or your preferred EDA). Once the draft design is ready, I’ll need simulations or bench measurements that prove at least 20 dB attenuation in the 50 Hz–2 kHz band while holding latency under 10 ms; please include SPI...