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I have a nearly finished schematic and two-layer board for a small dual-battery embedded system and want a second set of expert eyes before I send it off to fabrication. The design uses an LM393 for battery-level comparison, an OR-ing network for seamless battery switchover, a handful of dividers and pull-ups, plus some indicator LEDs. What I need is a focused design-for-manufacture sanity check, not a ground-up redesign. You’ll receive the PDF schematic, the native PCB layout files, and a short note describing the intended behaviour of each block. Please comb through the schematic first, flagging anything questionable in the OR-ing path, comparator stage, divider ratios, pull-ups, or LED logic. After that, glance over the layout—power routing, grounding strategy, trace widths—calling out anything that might bite me in production. The feedback that will help me most is an annotated version of the schematic with clear callouts of each change or concern. A concise summary alongside it is welcome, but the markup is the critical piece.
Project ID: 40204228
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Hello, how are you? I can help you finalize this with a true production-minded review, not a theoretical redesign. I’ve done many late-stage schematic and PCB audits for battery-powered embedded products, where the goal was exactly this: catch subtle issues before they turn into field failures or re-spins. I’m very comfortable reviewing LM393 comparator stages, battery OR-ing paths, divider accuracy, pull-up logic, and LED indication circuits from a practical standpoint. My workflow is straightforward and efficient. I’ll go through the schematic first and return an annotated PDF with clear callouts—what’s correct, what’s marginal, and what I would adjust (and why). Then I’ll do a focused pass on the 2-layer layout, paying special attention to power routing, ground return paths, trace widths, and noise sensitivity around the comparator inputs. You’ll get actionable feedback, not vague comments. I also have extensive hands-on experience preparing designs for JLCPCB fabrication and assembly—including stackup assumptions, minimum trace/space realities, soldermask quirks, and BOM considerations that affect yield and cost. I review designs with those constraints in mind, so nothing I flag is academic or unrealistic. If you want a clean, confident sign-off before sending this to fab, I’m well suited to do exactly that.
$30 USD in 2 days
2.8
2.8
21 freelancers are bidding on average $22 USD for this job

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6.7
6.7

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5.9
5.9

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5.5
5.5

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$10 USD in 1 day
4.9
4.9

Hello! We are experts in PCB design and layout optimization, specializing in embedded systems and electronics. Our team of Electrical Engineers is ready to provide a meticulous review of your schematic and PCB layout. We'll focus on the OR-ing network, comparator stage, dividers, pull-ups, LEDs, power routing, grounding, and trace widths to ensure a seamless design-for-manufacture process. Using industry-standard software, we'll deliver annotated schematics highlighting concerns and a concise summary for easy comprehension. Let us help enhance your dual-battery embedded system's reliability and efficiency. How can we assist you further?
$10 USD in 3 days
4.7
4.7

I would be happy to provide a comprehensive design review for your dual-battery system. Since this relies on LM393 comparators and passive OR-ing (diode/MOSFET logic) rather than a dedicated PMIC, verifying the hysteresis and switchover threshold is critical to prevent "power oscillation" between the two batteries. I will perform a line-by-line validation of your design, focusing on: 1. Schematic Analysis: OR-ing Network: Verifying voltage drops and thermal handling during the switchover event. Comparator Logic: Checking the reference voltages and divider ratios to ensure the cut-off points match your intended battery chemistry. Hysteresis: Ensuring there is enough feedback to prevent the LM393 from oscillating at the threshold. ESD/Protection: Verifying input protection on battery terminals. 2. Layout & DFM Check: Current Capability: Reviewing trace widths against the expected load (IPC-2221 standards). Ground Return Paths: Checking for ground loops that could affect the comparator's accuracy. Manufacturing: Checking minimum clearances, drill sizes, and annular rings to prevent fabrication holds.
$55 USD in 2 days
4.0
4.0

Hi, I see you're looking for a thorough review of your dual-battery embedded system's schematic and PCB layout before it goes into production. It sounds like you want someone to take a close look at the OR-ing network, the LM393 comparator, and the overall design to ensure everything is in good shape. My approach would involve going through the schematic carefully, marking any potential issues, especially in the areas you've mentioned, and then reviewing the PCB layout for power routing and grounding concerns. I'll provide you with annotated feedback on the schematic, highlighting any changes or questions I have. A summary will accompany the annotations for clarity. With my background in circuit design and PCB layout, I can help ensure your project is production-ready. One question I have is: have you considered any specific tolerances or environmental factors that might impact the performance of your battery switchover mechanism? Best regards,
$38 USD in 5 days
3.6
3.6

Having read your project description, I strongly believe that with my comprehensive background in Electronics, proficient skills in CAD and PCB design, and deep knowledge of circuitry garnered from my Electrical & Electronics Engineering degree coupled with my Embedded Systems experience, I am uniquely qualified to perform the task at hand. Throughout my career, I have designed and built numerous embedded solutions comprising complex circuitry, integrating powerful microcontrollers including the LM393. My ability to use KiCad to design professional PCB layouts and perform thorough schematic reviews will be immensely beneficial to your project. I am meticulous in my approach to engineering as well as in problem-solving—your project demands nothing less. Not only do I bring a diverse toolbox of skills to every project, but I also offer a commitment to precision and excellence in all that I do. I take pride in the quality of my work and always ensure that it's aligned with the highest industry standards. Consequently, you can anticipate receiving an annotated schematic riddled with precise suggestions for optimization plus a summary for ease of reference. Ultimately, by choosing me for your project, you are assuring yourself of a sane design-for-manufacture review—an invaluable asset in this phase of your development process.
$30 USD in 7 days
2.9
2.9

Hey , I just finished reading the job description and I see you are looking for someone experienced in Embedded Systems, Signal Processing, Design Optimization, Technical Writing, PCB Layout, Circuit Design, Electronics, Technical Documentation, Electrical Engineering and Schematic Review. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am - 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Salik.
$10 USD in 5 days
1.8
1.8

Hi , I’ve carefully reviewed your job post and it’s clear you’re looking for someone with solid experience in Signal Processing, Circuit Design, Electrical Engineering, PCB Layout, Design Optimization, Technical Writing, Technical Documentation, Schematic Review, Electronics and Embedded Systems. This is exactly within my core expertise, and I’m confident I can deliver reliable, high-quality results. Rather than rushing into assumptions, I prefer to understand the project properly. I’d appreciate your clarification on a few points: Is the job description complete, or are there additional requirements or expectations? Do you already have any work completed, or will this be built entirely from scratch? Do you have a preferred timeline or deadline in mind? Why you can confidently work with me: Successfully completed 250+ major projects across different industries Maintained 100% positive feedback over the last 5–6 years Earned 100+ recent 5-star reviews, showing long-term client satisfaction I focus on clear communication, clean execution, and on-time delivery I work as a full-time freelancer and am available 9 AM – 9 PM (Eastern Time), ensuring fast responses and consistent progress. Due to client confidentiality, I share relevant work samples only in private chat. Let’s start a conversation so I can show you similar work and suggest the best approach for your project. Looking forward to working with you. Best regards, Arsalan Khan
$10 USD in 6 days
0.0
0.0

Hey , I just went through the project description, and I see you are looking for someone experienced in Signal Processing, Technical Documentation, Circuit Design, Design Optimization, Technical Writing, Schematic Review, Electrical Engineering, PCB Layout, Electronics and Embedded Systems. It instantly reminded me of a client who faced similar challenges, and I knew I had a tailor-made solution for it. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: • Is there anything else you’d like to add to the project details? • What’s the top hurdle you’re facing with this project? • What is the timeline to get this done? Why Choose Me? 250+ Projects. 5 Years. Zero Misses. My reputation is built on a single metric: Flawless Execution. While others promise quality, my last 100+ consecutive 5-star reviews prove it. I don’t just finish the job; I set the standard. Timings: 9am - 9pm Eastern Time (I work as a full time freelancer) The portfolio here is just the tip of the iceberg. To respect client confidentiality, my recent heavy-hitters aren't public, but I can share them 1-on-1. Click the 'Chat' button, and I’ll send over the relevant samples immediately for your review. Regards, Abdul Haseeb Siddiqui.
$10 USD in 5 days
0.0
0.0

Hello, I'm ready to provide a thorough review of your schematic and PCB layout. With extensive experience in embedded systems and PCB design, I’ll carefully analyze the LM393 comparators, OR-ing network, and other critical components. My goal is to ensure design integrity and reliability before fabrication. I’ll deliver an annotated schematic with my feedback and a summary for your review. What specific concerns do you have about the current design that you want to ensure I address?
$40 USD in 3 days
0.0
0.0

Hello there! I am ready to start your PCB review project, providing insights that will give you confidence before fabrication. My approach will involve a thorough examination of your schematic and PCB layout, focusing on the OR-ing path, comparator stage, divider ratios, pull-ups, and LED logic. Utilizing software tools, I will offer an annotated schematic highlighting any areas of concern, ensuring a comprehensive design-for-manufacture check. I understand the importance of clear feedback and will accompany the markup with a concise summary for your reference. Together, we can enhance your design to ensure smoother production. What specific aspects of the schematic do you find most critical for feedback? Best regards,
$10 USD in 5 days
0.0
0.0

Hey , I just finished reading the job description and I see you are looking for someone experienced in Design Optimization, Circuit Design, Schematic Review, Electronics, Technical Writing, PCB Layout, Embedded Systems, Signal Processing, Technical Documentation and Electrical Engineering. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am - 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further.
$30 USD in 1 day
0.0
0.0

Hello Dear! I write to introduce myself. I'm Engineer Toriqul Islam. I was born and grew up in Bangladesh. I speak and write in English like native people. I am a B.S.C. Engineer of Computer Science & Engineering. I completed my graduation from Rajshahi University of Engineering & Technology ( RUET). I love to work on Web Design & Development project. Web Design & development: I am a full-stack web developer with more than 10 years of experience. My design Approach is Always Modern and simple, which attracts people towards it. I have built websites for a wide variety of industries. I have worked with a lot of companies and built astonishing websites. All Clients have good reviews about me. Client Satisfaction is my first Priority. Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. Angular JS 7. React JS 8. Node JS 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .Net 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB What you'll get? • Fully Responsive Website on All Devices • Reusable Components • Quick response • Clean, tested and documented code • Completely met deadlines and requirements • Clear communication You are cordially welcome to discuss your project. Thank You! Best Regards, Toriqul Islam
$30 USD in 1 day
1.8
1.8

Hello,there Thank you for posting your project, "PCB Review Needed." I've read the description carefully and am confident that I can successfully complete this project. I have over 7 years of experience in Electronics, Technical Writing, Electrical Engineering, PCB Layout, Circuit Design, Embedded Systems, Schematic Review, Signal Processing, Technical Documentation, Design Optimization. I have done some projects as smiliar as this one. I can share my previous project experience if you'd like. I enjoy learning new technologies and taking on challenges, even those that seem impossible. I'm very interested in this project and am confident that I can deliver the best results possible without stress. I look forward to working with you. Best regards, Boris
$10 USD in 90 days
0.0
0.0

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