Circuit design freelancingcông việc

Completing an intermediate-level circuit simulation is on the top of my agenda, and time is of the essence. Key Requirements: - Generate a simulation circuit using either Verilog or VHDL. - The complexity level should be intermediate, meaning that it should include components such as adders, decoders, and multiplexers. Ideal Candidate: An experienced freelancer with a strong background in circuitry and simulation languages such as Verilog or VHDL. Quick response and comprehension of task requirements are paramount due to the urgency of the project. Remember, the successful completion of this project is deemed urgent. Therefore, a prompt response and start are appreciated.

I'm looking for a person whose work is jus...in a day 24 x 7 my customer will call and enquire about my business products( generally construction material supplier like sand , stone, cement , etc) they just have to politely receive the call and take that customer details , requirement and forward it to me That's it and also he have to advertise my business online in specific area to find online customers . Freshers who have just started freelancing can contact me i can consider them. Requirement : - 1) should be Indian citizen . 2) knows online Marketing . 3) Polite speaking behaviour . 4) can work 24 X 7. 5) work from home . I'm just starting my business by hiring you so i won't be able to pay higher Monthly salary so think about it and then contact me . ( basi...

Using an STM32F1 Microcontroller and a NFC reader like PN532 (or any other), write C code to a. write a string value to an NFC tag, hereafter referred to as 'data' b. read multiple tags (one by...multiple tags (one by one) and add their data (string value) to an array c. should be able to read minimum 4-5 tags one by one and add their data to the array d. send this array over UART to an ESP8266 (ESP code is not required) e. Use STM32F0 / STM32G0 The tags are placed within reading distance of the reader and the reader must read all tags and log their data to an array. No hardware or circuit design is required, only the STM code is required, along with the description of the hardware used (modules or chipsets that are used). Only limitation is that the NFC...

...looking for an experienced Electronics Engineer who can design a power supply circuit, specifically for charging devices. This project involves replacing a mechanical component, specifically a solid state regulator, with your innovative design. Skills and Experience Needed: • Solid understanding of power supply circuits • Experienced in electronics for charging devices • Familiarity with solid state regulators • Proven track record of successful circuit design The primary goal of this project is to create a reliable, efficient power supply circuit that can charge devices effectively. Please provide examples of similar projects you've completed in the past. Similar to attached file except 6 volt system and low side ...

...The primary theme revolves around education, and I am seeking a creative freelancing professional capable of making sense of the purely image-based content I will provide. Key Requirements: - The ability to translate images into a captivating and educational narrative. - Proven experience in creating presentations for a teenage audience. - A knack for combining visually-appealing slide layouts with educational content. - Fluent in English to ensure effective communication. Your skill in understanding the needs of the targeted age group, teenagers, and creating an engaging educational presentation that generates intrigue and sustains attention will be paramount for this project. If you have the experience and design prowess to brilliantly bring images to life within an e...

I am currently looking for an experienced PCB and IoT Hardware Design tutor who can guide me over important topics. Key Topics Include: - Circuit Design - PCB layout - Component Selection Please note that software and hardware specifications were not provided, therefore a well-rounded knowledge of common PCB design software and IoT-related hardware will be beneficial. There is no set deadline yet for completing the tutoring, however, a prompt response and availability to start soon will be appreciated. Ideal Skills/Experience: - In-depth knowledge of PCB designs - Understanding IoT Hardware Designs - Teaching experience or ability to deliver content effectively - Familiarity with various PCB design software - Knowledge of a range of IoT hardware is a ...

When posting a job listing on a freelancing platform to hire a Google Ads expert, you can write a clear and detailed question or job description. Here's an example of how you can structure it: Title: Experienced Google Ads Specialist Needed for Advanced Campaign Optimization Description: We are looking for a highly skilled Google Ads specialist to optimize and manage our Google Ads campaigns. The ideal candidate should have expertise in implementing advanced strategies to maximize ROI, attract quality leads, and improve overall campaign performance. Key Responsibilities: 1. Conduct thorough keyword research and competitor analysis to identify opportunities for campaign optimization. 2. Optimize ad copy, landing pages, and ad extensions for improved click-through rates (CTRs)...

...dealing with industrial machinery, I'm looking for an experienced and skilled electrical engineer with profound knowledge and understanding of circuit analysis and design. The main task will be the design of circuits for our industrial weighing machinery, contributing to their overall performance and efficiency. Skills & Experience: * Expertise in circuit analysis and design * Solid understanding of industrial machinery, specifically weighing machinery * Able to integrate theoretical concepts into practical applications * Detail-oriented, creative, and problem solving abilities The ideal candidate should be able to develop an effective circuit design for our industrial weighing machinery that will deliver outstanding reliabili...

I'm having trouble with my email delivery. Despite having a privately hosted email server, my emails are consistently being marked as spam. I have configured SPF, DKIM, and DMARC for my domain, yet the issue persists. To resolve this, I'm looking to engage a freelancing expert proficient in: * DNS configuration * Email server management * Spam filtering mechanisms. Your role would include troubleshooting to identify the cause of the problem and implementing a lasting solution. Previous experience working with privately hosted servers is a requirement. Having an understanding of spam management practices will be highly advantageous.

I'm looking for an experienced electronic engineer to take on a new consumer electronics project. The tasks that need to be performed for this project are: - Designing and analyzing circuits - Layout and fabrication of PCB - Prototyping and testing the design Though I have no specific constraints at the moment for the electronic design, the ideal freelancer should have a strong understanding of best practices in the field, as this may contribute to the efficiency and overall success of the project. Strong experience in circuit design, PCB layout, and prototyping is crucial. Experience in the consumer electronics industry would be beneficial, but not necessary. This project presents a fantastic opportunity for individuals passionate about electronics and ...

...seeking a skilled professional who can design an integrated system of electrical and mechanical systems for my home, with a focus on advanced features and efficiency. The project should specifically include: - Design of smart home automation systems, including energy efficient lighting fixtures and security systems. - Incorporation of Matter protocol for controllability through smart platforms like Google and Alexa - HVAC system planning, including floor heating, ventilation, and air conditioning inside the ceiling with a heat pump. - Drafting of plumbing and water supply systems. - Energy-efficient solutions I expect the freelancer to understand the application of Matter technology and smart home customization. A deep knowledge of electrical circuit design...

I'm looking for expert assistance with the electrical plan/schematic setup of a medium-sized swimming pool 30m2. This will involve the installation of pool lights, a pump system, a heating system and spare wall plugs for potential future use. Here's what I need: Switch/electricL box, containing circuit breakers and timer to control: -Pool lights - pump system - full inverter heat pump system - 4 spare wall plugs for future utilization - salt water solinator. The timer should control all the above, ecluding the pool lights

I'm seeking an experienced electronic engineer to assist me in setting up temperature control systems in my wine cooler. - To successfully accomplish this, you will need skills and proficiency in circuit configuration and electronic engineering. - I have a particular circuit diagram available that should guide you in understanding and optimizing the electronic setup of the cooler. - The prime task for these circuits will be to effectively regulate the cooler's temperature. Currently have BOM list and parts ready. I need help with 3 things 1. Reviewing BOM list and ensuring i have the correct setup (inc ensuring certain parts are waterproof) 2. Guide me through setup (connecting parts) 3. Guide me through testing The project is very simple 1. Activate 3 ...

...connected to X and use grease and mounted on external shaft (indicated by PINK COLOR) A printed circuit board will be equipped with the correct transistor drivers while the motor signals (pulsating or not) will be generated by a microcontroller The intention of this design is that 2 identical pieces of Y (call Y1 and Y2 for reference purpose) can move synchronously together (exactly same movement) or individually (opposite of each other lets say or one moving and the other one stand still) and this with just 1 single motor drive. The whole can be controlled by a single or dual push button (electrical signal) to actually have either Y1 or Y2 work individually or both together. As a suggestion, this design challenge probably requires an electrical/mechanical solution ...

I'm seeking an experienced electrical engineer to assist in building a drinks machine Key Tasks: - Generation of BOM list - Create wiring circuit and connecting machine components - Determine power supply and control system 1. should check prefabricated electrical machines such as shakers or stirrers, what should be done to dismantle them and what changes the devices make, so that we can design the body of the cocktail machine according to the changes in the final model. 2. An electrical engineer should design a simple power supply and control system and declare all the parts and boards and the amount of wires and sensors and everything that is necessary to finalize the body model, consider their placement, and also esmate the price of the electrical parts nec...

...points - our specialty coffee, ethically sourced beans, and our incredibly cozy and inviting atmosphere that sets us apart. 2. **Advertising and Promotions:** I need an expert who can design compelling ad campaigns and create coverable promotions that strike a chord with three main groups - young professionals with a discerning taste for specialty coffee, coffee enthusiasts who appreciate ethically sourced beans, and local residents who crave a warm and inviting coffee hub. 3. **Market Research and Analysis:** A comprehensive understanding of the competitive landscape is a vital asset. I'm searching for a freelancing professional skilled in constructing a powerful market analysis that will strengthen our strategic planning and decision-making process. This project ...

...in the field of Digital Logic Design/Systems who can help me solve problems related to flip flops, logic gates and sequential logic circuits. I'm really having a hard time solving my assignment questions and I need someone to help me within my budget. Could benefit from knowledge and experience in: Introduction, Material Related to Combinational Circuit Synchronous Sequential Logic: Analysis of Clocked Sequential Circuits Synchronous Sequential Logic: State Reduction and Assignment, Flip-Flop Excitation Tables Design of Counters, Problems Registers, Shift Registers Ripple Counters, Synchronous Counters Timing, Problems I would appreciate it if you could provide detailed project proposals, as well as examples of past work and experience in Digital Logic Des...

I am in need of a skilled engineer to design and develop an off-board charger for my e-bike. The charger should be designed for an input voltage of 220V and should be capable of outputting 48V to charge the e-bike. It should also incorporate key safety features: - Short circuit protection - Overheating protection - Overcharge protection The ideal freelancer for this project should have an extensive background in electrical engineering and practical experience in designing and developing off-board chargers for e-bikes. Proficiency in safety standard protocols is also necessary. You should also understand and implement the necessary regulations and standards related to designing e-bike chargers.

I'm in need of an individual skilled in Verilog who can help me achieve a specific task. - Task: Yo...writing Verilog code for a simple module implementation. This does not involve complex system level code designs or CPU architecture. - Objective: The primary objective of the module is to model a specific digital logic circuit. The project does not require interaction with other modules or utilization of specific hardware components. The ideal candidate would possess: - Solid experience in Verilog coding, - Expertise in digital circuits, - Strong understanding of digital logic circuits, - A meticulous approach to ensure accuracy in modeling the required digital logic circuit. If you are passionate about Verilog and love challenges, this project could be a perfect ...

...proposals. More details: Smart home. The smart home system has the following parts. Transmitter Several buttons are connected to the ports of an Arduino Pro Mini. When the respective button is pressed, and the gate goes low, a signal is sent to the receiver. The signal is sent with LoRa. (RFM95 433MHz) The transmitter is powered by 3 AAA batteries or an equivalent battery. The power circuit is replaced with a circuit that draws very little power. see this video Create a Gerber file for the PCB. Receiver The receiver is an ESP32 Node MCU with both WiFi and LoRa. for example Heltec WiFi LoRa 32(V3). The receiver has relays, dimmers for led lights, (possibly a camera) and a button to pair the device. Power from USB. Cost of Gerber file is reported

...Bangalore conducting research on careers. I'm looking for freelancers to participate in one of my research projects. By joining, you can contribute to a significant study on freelancing careers. This project's goal is to understand how freelancers measure their careers and what individual strategies they engage in. I will conduct in-depth interviews in person at the IIM Bangalore campus (if available in Bangalore) or over a video call (present outside Bangalore) that may take around one hour of your time. Please share your contact details or message me if you meet the following criteria. a) engaged in full-time freelancing based in India b) Working on medium to highly skilled (e.g., content writers, web developers, graphic designers, and IT consultants) gig assig...

I am seeking a proficient AutoCAD designer with exemplary skills in electrical design. In this role, you will be tasked with: - Designing an electrical circuit - Creating an effective wiring layout - Developing a functional panel design Your work will contribute to a small-scale project and will require a keen attention to detail. Skills in detailed, precise design work and experience with similar projects are crucial. Please note, I require the use of AutoCAD 2017 .dwg for this project. Familiarity with this software version is essential to your success on this project. If you feel these tasks align well with your expertise, I encourage you to apply.

English: I am seeking an electronics expert to develop a custom Printed Circuit Board (PCB) for a DC-DC Step-Up Boost converter with the following specifications: Input Voltage: 20 to 30V Output Voltage: Adjustable from 35 to 52V Current: Support up to 8A Specific Requirements: Maximum Voltage Adjustment: The board must include a method for adjusting the maximum output voltage limit. Current Limit Adjustment: Implementation of a system for adjusting the current limit through a 0 to 3.3V input signal, where 3.3V corresponds to the maximum limit of 8A. Shunt Resistor and OPAMP: Incorporation of a shunt resistor with OPAMP, including potentiometers for fine calibration. On/Off Function: The board should allow the option to switch between input voltage (off) and amplified output volta...

...with expertise in creating basic circuit boards to help with the development of a new product. We will have 15 led lights that can illuminate normally or flash. They will light in different sequences. Ie Light 1 flashes and light 5 lights. Then say light 3 illuminates and light 3 flashes etc. The idea is to have an app made to manage / send the info for the sequences, I need someone to create the circuit board with the lights so that we can connect to a mobile app. Key aspects of the project include: • The creation of a circuit board design that supports integrated circuits • The product is in its developmental stage, requiring your input and creativity Ideal skills and experiences: • Demonstrated experience in designing and developing...

A person with basic computer skill needed to help with various office task remotely. The position if for any entry-level personnel looking to start a career in freelancing. Interested candidate is expected to apply with a CV.

I'm seeking an experienced Electrical Engineer to design a small-sized custom Printed Circuit Board (PCB) with integrated ESP32 and DRV8833 motor control drivers and 18650 rechargeable bttery. - PCB Size: The PCB should be small-sized, built with quality and precision, and space-efficient. - Motor Control: It needs to control a DC Motor using DRV8833 motor driver, ensuring optimal performance and minimal signal interference. - Voltage Range: The PCB should be designed to handle an input voltage of 5V, ensuring it's safe and efficient. - Battery: The design should incorporate a rechargeable battery without compromising the compact size. The ideal candidate should have proficient skills and experience in PCB design, electrical engineering, and ESP32 i...

I'm seeking an expert electronics engineer to design a circuit for an Arduino-based, battery-powered hand warmer device. This design must incorporate intelligent functionality for temperature and run-time control. Key requirements are: * The device should warm up to 42°C and maintain this for one minute. After that, it should shut down and take a break for an hour (this cycle to repeat continuously). * The unit must have a maximum temperature limit of 45°C. * There should be a 0.96 inch OLED screen displaying temperature and time status. * The design should include push button control to start the skin warming and once the push bottom pressed again the program should quit off the warming cycle . * Using Normally closed temperature switch 45 deg. ...

I'm looking for an experienced full stack developer, particularly strong on the front-end, to create a web-based platform that simulates lab experiments focusing on Electronic Devices. Key Features: - Simulation of lab experiments specifically in the sector of circuit design and analysis. - Quiz section for each experiment Experience and Skills Required: - Extensive experience with Front-End development - Proven track record in creating interactive simulation applications The goal of this project is the realistic simulation of lab experiments conducive to a virtual learning environment. Relevant experience is essential. Please provide details of similar projects completed. Looking forward to collaborating!

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i just need a small circuit board design for my esp32 to sit in, and some pads for soldering wires. See diagram.

My project requires a proficient individual to create a PCB design using Altium Designer. The task specifically details: - Crafting a moderate complexity circuit, encapsulating 10 to 50 components. - The construction of a double-sided PCB. The ideal candidate should possess: - Proficiency in Altium Designer. - Previous experience with designing circuits of moderate complexity. - Relevant experience in creating double-sided PCBs. Please provide samples of previous works if possible. This will be a great opportunity for those with the right skill set. Looking forward to your responses.

I'm seeking a proficient electronics engineer to design a PCB board for a control system project. The PCB board needs to integrate key components: - A GPS Module - An ESP32 Microcontroller , Internet-POE ESP32 project is actually started, we already have the autium files with dimmension, but is full of mistakes. As an experienced professional in circuit design and prototyping, you will be tasked with ensuring these components are integrated seamlessly. Particularly, extensive knowledge in microcontrollers and GPS modules is essential for this project. The ultimate goal is a reliable and efficient PCB board for our control system.

I'm in the process of integrating a temperature sensor into a PCB circuit. Accomplishing this task requires in-depth knowledge and experience in programming in C++, Python, and Assembly language, as well as a deep understanding of both circuit design and sensor integration. Key requirements: - Proven experience in PCB circuit design, more specifically with sensor integration. - Proficiency in programming languages such as C++, Python, and Assembly language. - Detailed knowledge of temperature sensors and how to integrate them successfully into a PCB circuit. Your task would be to design a PCB circuit that integrates a temperature sensor while meeting the project requirements and timeframes. Interested specialists should demon...

...4G module that runs on 3.8VDC, along with other peripherals that require 3.3V. The input power for the system lies in the range of 12-18 VDC. The power management circuit designed should: - Regulate Voltage: Ensure the voltage received by the EC200U module and peripherals is maintained precisely at their required levels. - Provide Battery Backup: Ensuring constant supply of power to the 4G module even when the main power source is unavailable. When main power is available, the battery should be charged and system is power from main power. Suitable candidates should have prior experience working with power electronics design, and specifically with industrial settings. Understanding the robustness needed in harsh industrial environments is key. Prior work with 4G module...

...who can design a small circuit board (less than 2 inches). The board must utilize the Bluetooth audio master module I've sourced and support some basic Bluetooth pairing functions. Key Features: - Audio playback (via bluetooth module feasycom BT955) - Power management with 3.3V or applicable rechargeable battery and USB-C charging functionality - Button to scan for local Bluetooth devices - LCD display showing a list of devices - Buttons that give the ability to select a device from the display/list for pairing and pair to it - Button to reset the module/pairing - The bluetooth module will be set to HFP mode and support in/out audio from bluetooth headphones back to a wired in/out connection on the board. The professional I'm seeking ideally has experience with...

I'm in search of an expert in electrical engineering to create a unique circuit for timing a workout routine. The designed circuit should be capable of timing cardio exercises and strength training intervals for a seamless exercise regime. Key requirements are: - It should provide a signal for 1 minute of green light functioning as "exercise on", and 30 seconds red light acting as "exercise off". - This signals should be repeated cyclically until manually stopped. Ideal freelancers should have experience with circuit design, timing mechanisms, and they should have an understanding of fitness equipment or similar projects. This project offers an exciting opportunity to adapt traffic light technology for fitness purpose. If you'...

This project includes the control of a simulated Air Handling Unit and Compensated heating circuit. The 230V AC ‘Air Handing Unit’ (AHU) fan in this project shall be controlled using a VSD. A green ‘AHU Fan Running’ light on the front panel shall indicate if the fan is running. The operator should be able to set a desired speed of the fan on the HMI. The fan may also be controlled by a ‘Filter DP’ potentiometer at the front panel of the board. The potentiometer is being used to simulate a filter dirty condition, with an increase in resistance indicating an increasing filter dirty condition, thereby increasing the speed of the AHU fan to compensate. If there is a VSD fault, the AHU system should stop operating, and a red ‘VSD fault’ li...

...in-person role working in the facility. This is a contract role that can last a minimum of 2 weeks and up to 6 months with the possibility of permanent placement. Mechanical Design Engineer – Low Voltage Position Overview: This position develops custom solutions that are used in a multitude of industries. Each project takes an idea from concept to design, to production. Responsibilities include creating, updating, and releasing mechanical drawing packages for assigned projects in compliance with customer and industry specifications. In this function you will: Develop and update mechanical approval drawings based on design reviews and customer comments. Develop and release mechanical manufacturing drawings inclusive of sheet metal fabrication details (flat...

I am seeking an experienced electrical engineer, specialized in power system design. My project requires expertise in several key areas: - Circuit Design: This is central to the task. The hired professional will need to be capable of designing intricate power circuit systems that support my project's unique requirements. - Electrical System Analysis: I also require someone who understands the intricate details of electrical system analysis. You should be capable of assessing the viability and efficiency of the designed circuits, implementing changes if necessary. - Troubleshooting and Repair: There may arise situations where developed systems don't function as expected. Hence, problem-solving skills and ability to execute effective repairs are cruc...

...create a circuit board for me. The project entails designing a compact round circuit board to get power from a small solar panel for the sole purpose of recharging a rechargeable battery, such as the LIR2032, ML2032, or ECR2032. The selected candidate should provide comprehensive documentation detailing the circuit's design, functionality, and rationale behind design choices. Key Requirements: 1. Solar Power Integration: The circuit board should utilize solar energy from a small-sized solar panel. 2. Battery Compatibility: The designed circuit board must be compatible with rechargeable batteries such as LIR2032, ML2032, or ECR2032 3. Documentation: Thorough documentation covering the circuit's schematic, layout, and operational pri...

Pcb designer with knowledge of circuit diagram and sensors

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I require a talented app developer to create a freelance-like application specifically for Android users. The recognized completion timeline for this project should be within a month. Key Features: - Enable Project Bidding: The app should support a bidding feature, where freelancers can bid for projects. - Secure Messaging Functionality: A secure and encrypted messaging fu...ensuring private, safe, and efficient communication between freelancers and clients. - Integrated In-App Payments: The ability for clients to transact payments securely within the app is essential. Ideal Skills: - Proficiency in Android app development - Ability to incorporate secure messaging system - Experience in integrating payment systems - Understanding of app features analogous to existing freelancing ...

I need a skilled and experienced PCB designer who will focus specifically on product development for consumer electronics. This project involves a moderate level of complexity as it requires a standard multilayer PCB. The tasks expected to be conducted are as follows: - Mainly taking up PCB design tasks and associated BOM - Partial involvement in circuit design An ideal freelancer would have prior experience working with PCB designs in the consumer electronics field. Expediency, precision and a keen eye for detail are vital as the developed prototype will directly contribute to a physical product. The project is a signal converter and i can attach a video of its funtion. Due to my limited software i need to add 2 more ICs: A voltage regulator and a bandpass filter at ...

I'm currently in pursuit of a skilled Electrical Engineer with a hallmark in Mixed-Signal Circuit Design. The primary task at hand will be to assist in finalizing the design specifications of a Mixed-Signal Circuit I have partially completed. Key roles will include - Reviewing my current circuit design - Advancing the existing specifications - Finalizing the Mixed-Signal Circuit Design -I need some calculation that my project is success - Actual measurement The perfect candidate will possess the following skills and experiences: - Extensive experience in Mixed-Signal Circuit Design - Mastery in Electrical Engineering - Proven track record in assisting with design specification finalization - Astute att...

I am seeking a proficient electronics engineer or similar professional to design and develop a simple but reliable SPDT (Single Pole Double Throw) low voltage transistor microcircuit. The primary function of this microcircuit is switching between two circuits, not to amplify signals. We need to present a 5.1K GND to one of two GPIO pins on an MCU depending on the state of sensor output that throws a 5V high/low output on one single line Key Project Details: - The circuit should be designed to operate at low power levels to minimize power dissipation. - The preferred material for the transistor is Silicon. Ideal Skills and Experience: - Electronics engineering - Transistor theory - Circuit design and analysis - Experience working with silicon transistors a...

I am in urgent need to have an admin panel developed for my freelancing app. Your prime responsibilities will include: 1. **User Management:** You need to ensure a seamless user experience by designing and implementing features for user registration, login, roles, permissions, and profile management. Although the approach wasn't specifically mentioned, these functions are the basics for managing users. 2. **Project Management & Reporting:** You will have to develop features to manage projects within the app efficiently. Also, generating various types of reports is crucial for me to gauge the app's performance and drive future strategies. Speed is of the essence here, as I am looking for the project to be completed ASAP. Therefore, professionals with previous experie...

Design and build a sine wave signal generator. The specifications are as follows: - Sine wave output in the range of 40.0-50.0kHz. User adjustable via potentiometer. - The maximum output voltage 20V. - You select power supply (110VAC 60Hz to DC). - BNC output connector. - 3-digit frequency display (plug into PCB via a socket). Design circuit, create PCB layout and manufacturing files, and arrange for 4 PCBA prototypes to be built and shipped to me in the USA.

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I require a professional to design a basic single layer PCB prototype using KiCad software. The design has to be brought to life from an existing drawing. Ideal Skills And Experience: - Proficiency in KiCad software for PCB design - Experience in creating basic single-layer PCBs - Understanding of circuit prototyping This is a rather straightforward assignment for someone with the right set of skills and experience. Your role will be instrumental in developing the prototype that forms the backbone of my product. Accuracy and attention to detail in your work are paramount, as the PCB layout will form the foundation of the final product. If this matches your skills and experience, I look forward to your proposals.