12volt simple battery charger circuit diagram jobs

I have a power amplifier that's not producing any sound. I've already checked the cables and connections but the issue persists. I'm looking for an electronic engineer with experience in diagnosing and fixing power amplifiers. Ideally, you should have a strong background in circuit analysis and repair, and be skilled in troubleshooting transistors and ICs. Please message me if you're interested in helping me restore my amplifier to full functionality.

I need a C language expert to write simple programs for Jieli MCUs AD142A4 or AC6082A2 microcontroller units (MCUs). The primary function of these programs will be controlling an LED blinking , and read digital inputs (just basic programs) The scope includes: - Writing C programs for both types of MCUs - Implementing control systems for LED blinking Skills and experience required: - Proficiency in C programming - Experience with Jieli MCUs, specifically AD142A4 or AC6082A2

Based on existing table, referral will get commission based on order. Percentage based. Work with ftp only.

I'm obtaining a permit from the City of Phoenix to add a 50A dedicated circuit for a pool heater. The City of Phoenix requires: (1) Electrical Load Calculation that will ultimately show at/below 200A for my existing setup + new pool heater (Pentair Ultratemp 140 H/C) (2) Electrical Panel Schedule showing existing + new circuits (NOTE: We have a 200A main panel, then a 125A sub-panel connected, see attachments). Seeking an expert to take my attached documents along with the City's examples and share (1) Electrical Load Calculation and (2) Electrical Panel Schedule that I can submit right to the City of Phoenix along with my permit application. Key Requirements: - Analysis to include lighting and outlets, HVAC systems, and all of my appliances. - Ability to follow stand...

I have a simple mobile app developed on the IONIC platform that needs a quick update. The app works perfectly on Android devices, but we've changed our server, necessitating a URL change in the app's coding. Your tasks will include: 1. Updating the services folder's URL or path based on the test URL or path that we will provide. 2. Rebuilding the APK and sending it back to us. 3. After successful testing, we will supply the final URL. 4. Updating the code with the final URL and rebuilding the APK. This is a straightforward task that should take only a few minutes for a developer. Please let me know your proposed cost. We aim to complete this project within one to two days. Ideal skills for this job include: - Proficiency in IONIC - Experience with Android app devel...

I need detailed flow charts and data flow diagrams drawn for a JavaScript Chrome extension code. This extension detects text input fields and autopopulates them. The diagrams should be insightful enough to show the workings of the DOM parsing algorithm and the autopopulating algorithm. Key Requirements: - The primary goal of these diagrams is to aid developers in understanding the code. - The diagrams should clearly outline the step-by-step process of the algorithms. Ideal Skills: - Proficiency in creating flow charts and data flow diagrams. - Experience with JavaScript and Chrome extensions. - Ability to convey complex processes in a clear and concise manner.

I need a 3-4 page website to display company data, sourced from a database (likely an Excel sheet). The site should have the following pages: - Home - About Us - Search instruments - Indices Ideal skills and experience for the job include web development, data management and Excel. The primary goal of the site is to showcase information, so a clean, user-friendly design is essential.

I'm seeking a talented Wix designer to create a simple, yet effective, business showcase website for me. Key Requirements: - The website should include an "About Us" section, a "Services Offered" section, and a "Customer Testimonials" section. - I'm in the process of developing my branding, so I need the designer's expertise in finalizing color schemes and design elements. Please show me your portfolio of Wix-designed websites. I would like to see examples that reflect a similar purpose and design aesthetic.

...Comprehensive Testing: Thoroughly test all app features, functionalities, and user flows on your iOS device. This includes: Navigation and UI/UX testing across different iOS versions and device screen sizes (please specify your device and iOS version in your application). Functional testing of all features and user interactions. Performance testing (e.g., app launch time, responsiveness, memory usage, battery consumption). Usability testing, identifying areas for improvement in user experience. Testing under various network conditions (Wi-Fi, cellular, offline). Detailed Bug Reporting: Document all bugs and issues found with meticulous detail, including: Clear and concise descriptions of the issue. Precise steps to reproduce the bug. Screenshots or screen recordings demonstrating...

...services to global clients, primarily focused on Printed Circuit Board (PCB) design and manufacturing. Our uniqueness lies in designing, prototyping, and developing diverse electronic hardware in a customized and highly precise manner. As a firm, we can transform your ideas or functional diagrams into electronic circuits or products that enhance the functionality of electronic devices. With a team of proficient engineers, we create exceptional electronic designs. Role Overview: R&D Engineer Location: Chennai, Tamil Nadu Key Responsibilities: • Product Development & Redesign: Develop new electronic products and redesign existing ones. Conduct research and testing on product concepts to improve functionality and performance. • Circuit Design: Design and dev...

I’m in need of a professional who can design a Switching Mode Power Supply (SMPS) for industrial use. The requirements for the power supply are as follows: - Input: 12-30V DC - Output: 19.5V - Current: 10.3A Key Features: The power supply needs to be robust and reliable, equipped with: - Overload Protection - Short Circuit Protection - Temperature Control While there are no specific certifications or standards required at this moment, it's important that the design considers the necessary industry standards for safety and performance. The ideal candidate should have extensive experience in power supply design, particularly for industrial applications, with a strong understanding of SMPS technology.

I'm in need of a specialist who can create a detailed design with specifications for an electric two-wheeler wiring harness. Your tasks will encompass: - Integrating various components into the wiring harness design including: - Battery connections - Lights and indicators - Motor controller - Instrument cluster - Telematics - Hub motor - More - Ensuring the design adheres to electric vehicle standards. Ideal candidates should possess: - Extensive experience in designing wiring harnesses, preferably for electric two-wheelers. - In-depth understanding of electric vehicle standards. - Proficiency in creating detailed designs with specifications.

I'm seeking a freelancer who can create a simple-detail 3D model of an object for printing. The primary purpose of this model will be as a decorative cosplay item. But would also like optional fidget function with articulated legs for my figure. Key Requirements: - Expertise in 3D modeling software. - Prior experience in designing for 3D printing. - Ability to create simple, yet visually appealing designs. The model should not be overly intricate, as it is intended to be a simple decorative object. I look forward to your proposals.

I'm looking for a skilled designer to create a visually appealing schematic for a project in the field of Electronics, Physics, and Nanotechnology. Key Aspects: - The diagram should have a strong visual appeal, as it will be used for presentations and publications. - While the visual aspect is crucial, the schematic must still be accurate and detailed to serve its purpose in the scientific community. Ideal Skills: - Proficiency in schematic design software. - Strong background in Electronics/Physics/Nanotechnology. - Excellent design skills with a focus on visual aesthetics. Please provide samples of your previous work in your proposal.

I'm in need of a seasoned MATLAB and Simulink specialist who can assist me with a project involving the design and development of a 20kV and 50kHz system for generating RF Cold Plasma. Key Responsibilities: - Create a comprehensive sim...in need of a seasoned MATLAB and Simulink specialist who can assist me with a project involving the design and development of a 20kV and 50kHz system for generating RF Cold Plasma. Key Responsibilities: - Create a comprehensive simulation of the system in Simulink - Ensure the simulation accurately reflects the intended circuit design Ideal Skills and Experience: - Proficient in MATLAB and Simulink - Prior experience with RF Plasma simulation preferred - Strong circuit design understanding - Excellent analytical skills for interpret...

I need a professional who can convert my hand drawings into a detailed Piping and Instrumentation Diagram (P&ID). Key Requirements: - CAD expertise, specifically in P&ID creation - Ability to accurately translate drawings into CAD - High level of detail and precision - Create autocad blocks for features - Create template layout with title head - Proficiency in adding comprehensive annotations and specifications - Previous experience in system design CAD projects Ideal Skills: - CAD software proficiency - Mechanical drawing skills - 3D modeling experience Please provide examples of similar projects you've completed. Looking forward to your bids. Example P&ID required to be drawn up

Hi We are needing a small easy update to our logo. we have 4 versions attached to this project and we want the 2024 barbal image attached as well as a 2025 version for tomorrow. Budget is $10 and we need this done NOW. There will be plenty more work for the right person. We'd like the 2024 barbal to hang off the end of the Z to look like it is through the circle at the top of the burble . Then we want a 2025 version as well for each of the 4 versions supplied in PNG the same resolution and in high quality and of course NO background color as it is now. The 2025 version the icon is currently black we'd like it the same blue as the SEARCH text blue so it fits in.

I need someone to duplicate 1-10 PDF files. The copies should be exact, with no modifications or edits needed with the exception of removing the watermark "NOT TO BE USED FOR COMPLIANCE ....... DOCUMENTS". The primary purpose is simply to create duplicate files that does not have the water mark, so attention to detail is important to ensure every aspect of the original PDFs is replicated exactly in the duplicates.

I'm seeking a freelancer who can create a simple-detail 3D model of an object for printing. The primary purpose of this model will be as a decorative cosplay item. But would also like optional fidget function with articulated legs for my figure. Key Requirements: - Expertise in 3D modeling software. - Prior experience in designing for 3D printing. - Ability to create simple, yet visually appealing designs. The model should not be overly intricate, as it is intended to be a simple decorative object. I look forward to your proposals.

I need a professional who can write a comprehensive research paper on estimating the state of charge of lithium-ion batteries using an extended Kalman filter. The goal is ...charge of lithium-ion batteries using an extended Kalman filter. The goal is to optimize the state of charge in an academic manner. The paper should be submitted as a Word document and must include the following sections: - Abstract and Introduction - Methodology and Results - Conclusion and References The ideal candidate for this project should possess: - Extensive knowledge and experience in battery research and estimation techniques. - Proficiency in academic writing. - The ability to provide an in-depth analysis of the subject matter. Please make sure your bid demonstrates your ability to meet these req...

I need to create 6 very simple scenarios in 3ds Max, each representing a different theme: Christmas, Horror, Tetris Game, Robots, Pollution, and Classical Music. The style should be minimalistic. Key Requirements: - Simple but effective 3D modeling - Use of minimalistic design principles - Incorporation of basic lighting and textures - Emphasis on characters, lighting effects, and textures in each scene I will provide reference images for each scenario. The ideal freelancer for this project should have experience with 3ds Max, a good understanding of minimalistic design, and the ability to create simple but engaging 3D scenarios. There are some examples here that are from another topics and it just for you to undestand what i am asking.

I need a skilled Arduino professional to design a compact, wireless device for me. This device will blink an LED light on a predetermined date, operating on a long-lasting battery. Key Requirements: - The device should be suitable for indoor use. - It needs to be as small and compact as possible. - Experience with Arduino is a must. - Prior work with designing battery-powered devices is preferred. - Knowledge of LED circuitry is desirable. - Understanding of timing mechanisms for the LED blinks. - Ability to ensure efficient power usage for long battery life.

...smaller) incorporating the STM32 microchip for UART, SIM800L (GSM), and NEO-6M (GPS). The design should also accommodate a buzzer, mini LEDs, and USB-C charging, with provisions for battery integration (details to be finalized). Key Tasks: - Optimize the antenna design for GSM and GPS to ensure the best performance. - Create compact and efficient layouts that can withstand the rigors of a prototype. - Transition existing code from ESP32 to STM32. Key Considerations: - The primary focus of the PCB design is compactness. The smaller the PCB, the better. - The IoT device will be powered by a rechargeable battery, so consideration for this power source is crucial. - GPS accuracy is the most critical feature of the device, so the design should facilitate this. Ideal Skills ...

...thematic designs are essential. Key Requirements: • The designer must sign an NDA before receiving detailed project specifics. • Provide examples of previous design work (board games or similar projects preferred). • Ability to deliver high-resolution, print-ready files for production. • Collaboration and timely communication during the project. Scope of Work: 1. Game Board Design: • A circuit-style board layout with thematic elements (e.g., start/finish line, pit stops, trivia spaces, hazards, and action spaces). • Approximate size: 20x20 inches, foldable for compact storage. • Clear icons and visually distinct spaces for movement and interactions. • Decorative elements to enhance the motorsport theme, including textures, cur...

I need an expert in circuit design and reverse engineering to help me replicate a 24v 2.5v SMPS (Switched Mode Power Supply) circuit for a new application. Key Tasks: - Reverse engineer the existing circuit and create a full schematic and operation guide - Design a new SMPS circuit capable of driving a mixed load (inductive and resistive) Ideal Skills & Experience: - Proficient in circuit design and reverse engineering - Previous experience with SMPS circuits - Able to create comprehensive schematics and operation guides The goal is to fully understand the existing design so that we can replicate it for a new use. The focus will be on creating a circuit that is capable of handling a mixed load, as well as improving efficiency where possible...

The idea app..ask all permitions to user, that app let easy saves position of user every hour. The idea is user not knows this, and not have any notification that bothers hims. Is really important this works all time, so app not be closed by system. Android app made in kotlin.

I need a calculator built that will be primary on a website. It will ask users their vehicle year, type and what US county they reside in. When they press submit it sends them to another page with pre-written information about what they need to pass a car test. Developer will ensure the information is displayed in a good way. Will be PHP in Wordpress

I'm looking for a skilled logo designer to create a straightforward, modern style, monochrome logo for me. The design should incorporate both text and an icon. All the necessary details will be provided, and I expect it to take no more than an hour of your time. Ideal Skills: - Proficiency in graphic design software - Previous experience with logo design - Understanding of modern, minimalist design principles Please provide examples of your past work that align with this project scope. Thank you.

I need a modern and sleek website to promote my business. This will be a simple site, but it will need to effectively showcase our services, and include customer testimonials. Key Features: - Contact form: This will allow potential customers to get in touch with us easily. - Service Descriptions: Clear and concise descriptions of the services we offer. - Customer Testimonials: A dedicated section to showcase positive feedback from our valued clients. Ideal Skills and Experience: - Proven experience in web development, specifically with creating simple yet effective business websites. - Strong SEO skills to ensure our site can be easily found online. - Experience in website management, with the ability to maintain and update the site as needed. - A keen sense for modern and...

I'm looking for an experienced electronics engineer to design and code a circuit board that can control both analog RGBW LED strips and digital addressable LED strips (like WS2812) using an ESP32. Key Responsibilities: - Design a circuit board compatible with both types of LED strips - Code the ESP32 to control the LED strips - Ensure the circuit board can perform static color displays on the LED strips Ideal Skills: - Proficiency in circuit design and coding - Previous experience with ESP32 and LED strip control - Ability to create a robust and efficient circuit board Please note, there is no need for the circuit board to support any wireless control options or music synchronization. The primary focus is on controlling the LED strips to di...

my ofer for Simple Menu Animations

My Huawei phone is stuck on the EMUI e-recovery page and I need an expert to help troubleshoot the issue. I was on a whatsapp phone call when it shut down due to a dead battery. Background: - I have already attempted all options I found online to fix the issue without success. - The cause of the problem is currently unknown to me. - There are some important files on the phone that I need to recover. Ideal Skills: - Extensive experience with Huawei phones - Proficient in troubleshooting software issues - Capable of diagnosing potential hardware problems - Skilled in data recovery Ideally, you should be someone who is well-versed with Huawei devices and can offer a solution to my predicament.

I'm looking for a proficient WordPress developer who can assist in setting up a simple 3-4 page website with an AI chatbot. Key Requirements: - Install and customize a simple AI-like theme on WordPress. - Create a 3 to 4 pages site, with potential pages being: Home, About Us, and Contact Us. - Integrate a text-based AI chatbot into the site. - Ensure the chatbot is functional and user-friendly, as it will serve as the primary interaction point for users. Ideal Skills: - Proficiency in WordPress and theme installation. - Experience with AI chatbot integration on WordPress sites. - Strong understanding of creating simple, clean, and engaging websites.

I need a talented website developer to create a simple yet aesthetic wedding website. The primary purpose of the website is to display event information to our guests. Key Sections: - About Us: A brief introduction about the couple. - Event Schedule: Detailed timings of the wedding events. - Accommodation Details: Information for out-of-town guests on where to stay. - FAQ: Answering common questions from guests. Design Style: The preferred design style is modern. The website should be clean, easy to navigate and visually appealing. Ideal Skills: Web development, UX/UI design, experience in creating event-specific websites.

Task Details: Record approximately 502 phrases, each phrase recorded twice—once at normal speed and once at a slightly faster speed. Additionally, record 2 phrases 10 times each, for a total of 1,024 recordings. Speech Speed Requirements: One recording at a slightly faster speed and one at normal speed. No noticeable pauses; pauses within a sentence should not exceed 0.5 seconds.

I'm in need of a straightforward WordPress site that animates through hover effects to showcase my consulting services. The site should also include a portfolio section with an image gallery, video showcase, and client testimonials. Key requirements: - Proficient in WordPress development - Experience with animation implementation, specifically hover animations - Capability to create a portfolio section with different elements - Skills in web hosting setup and management Ideal candidate will have a strong background in web development and a knack for creating engaging, animated web experiences.

I have a power amplifier that's not producing any sound. I've already checked the cables and connections but the issue persists. I'm looking for an electronic engineer with experience in diagnosing and fixing power amplifiers. Ideally, you should have a strong background in circuit analysis and repair, and be skilled in troubleshooting transistors and ICs. Please message me if you're interested in helping me restore my amplifier to full functionality.

I need to remotely access serial ports over a 4G connection. My actual solution that is working is: REMOTE SIDE, this consists on a battery operated device controlled by 2 UART PORTS (RS232 9600 BAUD 8 byte transparent SERIAL (HARDWARE 2 X serial to Ethernet converter (MOXA 5110), 1 X Openwrt modified router with wireguard tunnel configured, 1 X 4G modem (ALSO INCLUDE 2 NORMAL IPCAMS (CCTV) CONNECTED TO SPARE ETHERNET PORTS OF THE ROUTER) LOCAL SITE , VPN SERVER, this is actually my local home network I used it since it's a stable and accessible network (1 X OrangePi with piVPN and wireguard, 1 fixed internet connection router) CONTROL SIDE, this is consists on the remote control of the device. Its a box with keys that "just" send and receive serial data over two S...

I'm seeking a full-time freelancer for two months, focused on building a front-end container using Flutter for both iOS and Android. The project encompasses a straightforward website integrated with SAAS billing modules via Stripe. Key Responsibilities: - Mobile App Development: Building a simple, user-friendly mobile application with Flutter. To design the user journey using Figma. The mobile application is a simple profile / chat interface (integrated to api) - Website Development: Creating a simple website with integrated SAAS billing modules. - Payment Processing: Implementing seamless payment processing through Stripe. - User Authentication: Setting up a user login system. - Push Notifications: Integrating push notifications within the app. Essential Skills...

I need 6 simple scenarios created in 3DS Max. The themes for these scenarios are Christmas, Horror, Tetris Game, Robots, Pollution, and Space Ship Race. Key Requirements: - Use of basic shapes and textures. - No animations required, just static scenes. - Freestyle approach with creative freedom for color schemes and themes. Ideal Skills: - Proficiency in 3DS Max. - Ability to create visually appealing and thematic scenarios with basic shapes and textures. - Creativity and ability to work freestyle. It will be around 50 euros.

...programmer and circuit designer to help create a home security system using a Raspberry Pi. Key Requirements: - Programming the Raspberry Pi to facilitate automation and control tasks. - Designing a circuit that integrates with various security components. - Enabling wireless communication between the Raspberry Pi and various sensors and cameras. Main Components: - Cameras and video recording: The system should be able to capture footage and potentially stream it. - Sensors and alarms: Integrating motion detectors, door/window sensors, and alarms is crucial. - Remote access and control: The system needs to be controllable and accessible from a remote location. Ideal Skills: - Proficient in Raspberry Pi programming and microcontroller programming. - Experie...

I need to create a logo for a dress store

I am in need of a professional to help with my small remote control project. Currently, the device has been built, but I am seeking someone to make certain improvements to its performance as well as additional functionalities. Your main tasks will be: - Enhancing Features: Introduce new capabilities to the remote control that align with my vision while improving its performance. - Optimizing Code: I want the code to run significantly faster, meaning you will need to revise and optimize it to ensure there is a speed boost in processing time. Ideal candidates are those who have a keen eye for quality code writing and experience with programming for hardware devices. A strong understanding of algorithms, code efficiency metrics, and hardware-software integration is vital for this pro...

I'm looking for a skilled Android developer to create a straightforward contact management app for my mobile. The core functionality of the app should include: - The capability to search and filter contacts Additionally, this app needs to sync seamlessly with Google Contacts. The ideal candidate should have: - Proficient experience in Android app development - Prior experience in developing contact management apps - Knowledge and experience with Google Contacts API - Strong skills in creating user-friendly, efficient apps

***Please read it thoroughly and let me know if it’s doable for you. Kindly avoid placing a bid in just a second without fully reviewing it.*** 
i have a presentation, with the subject: ‘’ Limitations of hybrid imaging devices (e.g., by attenuation correction) —> Discuss potential effects from auxiliary imaging (e....on image quality, supported by clinical examples. * Conclude with a discussion on mitigation strategies and their effectiveness, tying back to the artefacts previously discussed. —Visual Aids and Supplementary Materials— * Include clinical CT images demonstrating: * Streak artefacts caused by metal implants. * Beam-hardening artefacts in dense anatomical regions. * Use a flowchart or diagram to visually connect artefacts...

ONE PRODUCT SHOPIFY SHOP , SIMPLE !! Key Requirements: - Modern and sleek design - Cloning a pre-existing website - Setting up customer reviews functionality Please note that you are free to choose a theme, as long as it aligns with a contemporary and streamlined aesthetic. The primary purpose of this project is to replicate the design of the website to be cloned. Ideal Skills: - Proficient in Shopify platform - Experience in website cloning - Strong understanding of modern design aesthetics Please reach out to me for more information.

I'm interested in purchasing ready-made simple games, similar to the one in the provided link. The games should be compatible with both the Google Play Store and the Apple App Store. Key Requirements: - Available, ready-made simple games akin to the example - Cross-platform compatibility (Google Play and Apple App Store) - Potential for customization (gameplay mechanics and visuals) - Competitive pricing for bulk purchase Please reach out to discuss pricing and potential game customizations.

...expert who can design a circuit aimed at preventing current from flowing into a primary battery. This circuit will be used in a hazardous environment and needs triple redundancy. Normally this can be done with 3 diodes in series (see example attached) but the voltage drop is too big with diodes. Battery is 3.6V and circuit needs at least 3.3V. The design must adhere to the following specifications: - Incorporate triple redundancy - Ensure minimal voltage drop across the circuit - The circuit must be able to withstand a malfunction in the main device that could produce up to 7.5V without allowing any current to flow into the battery - Background current consumption should be minimal Ideal candidates for this project should posse...

I need a QGIS plugin that can read addresses from an Excel sheet (addresses in Denmark, Europe), geomap them using a free geomapping service/plugin (already exists) so they show as dots on a map, and group them into custom map layers based on categories in the Excel spreadsheet. Key requirements: 1. Importing addresses from Excel to QGIS 2. Geomapping the addresses so they shown on a map as dots on the map. 3. Organizing the locations/dots into layers, grouped by custom categories in the spreadsheet. 4. Changing the color of the map dots based on info on the spreadsheet.. 5. Adding an infobox in QGIS, so when a dot on the map is clicked, information originally from the spreadsheet pertaining to that address will show in an info-box in QGIS. 6. Ability to make the plug-in work wi...

I'm looking for a developer to create a simple web-based game that revolves around questions and answers, with a twist - players need to pay to enter the game. Key Features: - Payment Integration: The game should support multiple payment methods. These include Credit/Debit Card, PayPal, Alipay, WeChat Pay, and Venmo. Prior experience with payment gateway integrations is a plus. - Game Mechanics: The game will consist of multiple choice questions. The developer will need to create a system for sourcing questions and ensuring a balanced level of difficulty. - Scoring System: Players will only see their scores at the end of the game, not after each question. Experience in developing similar scoring systems would be beneficial. The ideal candidate would have: - Strong web develo...