Circuit Design Jobs

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Fixed-Price - Intermediate ($$) - Est. Budget: $5 - Posted
Hello, We are seeking a knowledable, well established, experienced freelancer in the area of electronic circuit design, for our new LED module. We are designing a new LED module/light for the mobile industry i.e. automotive industry. Contractor must be able to provide: 1. On time design of electronic LED circuit to meet our requirements. 2. Understand and speak English fluently. We already have a design in house in which is a high-end LED module with mid-power LED's, LED drivers, micro, etc. It can be programmed to our desired flash pattern. This is a mid/high power LED module and is considered our high end module as well as higher cost unit. We are complete with this and only use it as a reference. Our New Requirements: We now need a new design which will utilize the same board envelope size as our other LED module since it will go into the same plastic housing. BUT, this circuit should be designed as cost effective as possible using as few components as necessary to complete the job. It is VERY cost sensitive. Some of the basic requirements of the design will be as follows: - As mentioned, the board size and envelope has already been determined. It is roughly 2.4" (inches) x .540" (inches) and is .062" thick. I will provide exact envelope size upon awarding the job. - The number of layers required will be determined by the designer. - There will be (3 pcs) of 'low' power LED's on each side of the board. We are working on determining size, but looks like 2835 size or 5050 size SMD (we are open to recommendations on high quality LED's that are readily available and are inexpensive. Chinese? Looking for the most Lumens available in low power SMD). So, on side 1 there will be 3 pcs SMD LED and 3 pcs SMD LED on second side. Total of 6 LED's all on one circuit. - As mentioned, this board will be very basic and will include as few components as necessary to get the job done effectively. These 6 LED's will have a constant flash pattern of on / off. When the LED module is supplied with power, it will start flashing and will not stop flashing until power is removed. We DON'T want to program a micro and don't think a micro is necessary to accomplish this. How about a 555 timing circuit or something similar? Are there other chips available that will provide this timing solution cost effectively? We want to assembly the PCBA with the components, power it up, and it function i.e. no programming, etc. On/Off times need to be discussed. But, we imagine something like 100ms on / 100 ms off type pattern. - The circuit must be able to accommodate 12-30 VDC (mobile) supply voltage range. - The circuit must be able to handle normal voltage spikes. - Board must be able to dissipate any heat that builds up (there may not be any with low power LED's). I believe this gives you a good idea of the overall scope of the project. To sum it up, it is basically the circuit design of a mobile LED module utilizing a timing circuit and no micro. It should be able to be used in 12-30VDC automotive applications. Please send us your resume and idea of timeline and cost for this project. Thank you for taking the time to review and comments. Best Regards, Mike
Skills: Circuit Design
Fixed-Price - Intermediate ($$) - Est. Budget: $250 - Posted
Seeking an experienced electrical engineer or technician to redesign a 42A LT3751 charging circuit for use in a prototype board. Possibility of work on more extensive full production circuit if design is good. Required: Experience working in Eagle, experience with LTSpice simulation software, strong background in DC-DC flyback converters, capacitor charge controller operation. Preferred: Electrical engineering degree
Skills: Circuit Design Eagle Electrical Drawing Electrical engineering
Fixed-Price - Expert ($$$) - Est. Budget: $100 - Posted
Hello i am looking for a hardware circuit/schematic design engineer who is very good is designing circuits/schematics. Basically i have a schematics which needs to be modified. i have one sierra wireless aircard 320U connected to the USB1 i have one TL-WN722N wireless USB adapter (wifi) connected to USB2 your tasks 1) now we will use Sierra Wireless Airprime MC7355 to be connected to mini PCIe M.2 slot hence we need to design a circuit so that host can talk to the modem on mini PCIe slot and obviously the modem must be connected to the SIM card slot. 2) and wifi must communicate with the host with some reasonable bus. in other words this usb must talk to our hardware 3) we need to add RS232 , RS485 ports to the schematics as well. Pre-requistes: please make sure you have worked on designing circuits involving sierra wireless airprime with PCIe slot and wifi as well Regards
Skills: Circuit Design Computer Hardware Design Integrated Circuits PCB Design
Fixed-Price - Intermediate ($$) - Est. Budget: $125 - Posted
For this job, you will be required to complete a total of 6 lab reports (Labs 4 + 6-10) and simulate digital logic circuits in a program such as Logisim ( or LogicWorks or any digital logic simulator. You must use simulation software to check your work and build schematics, saving schematic files, as well as taking screenshots of the schematics being simulated successfully. You will need to save every Logisim/simulated schematic file (.circ) as you build it while completing the steps of each procedure in each experiment and submit with a well formatted report. When submitting for review, you will send the report, the .circ file, any screenshots of a simulated circuit, and any other relevant information/data. Laboratory Experiments 1-3 and Lab 5 have already been completed. You will only need to do Experiments #4 and #6-10. View the EXAMPLE files to see how the work was done and how to set up and format properly. I have included COMPLETE examples of Labs 2, 3, and 5. You can view INCOMPLETE and possibly inaccurate Lab examples 6, 7, and 8. However, these may be incorrect results and still do not have the simulated digital circuit. The only real work is completing the questions, any calculations, and creating the schematic being simulated for the lab experiment. Skills required: Electronics, Digital Logic, Circuitry, Knowledge of Components, etc. Compensation is negotiable depending on your skills and how well you do on the reports.
Skills: Circuit Design Digital Electronics Electrical engineering Electronic Workbench
Fixed-Price - Intermediate ($$) - Est. Budget: $500 - Posted
Hello, I am working on a new type of interactive puzzle maze toy which responds to player actions (ex. tilting the toy, driving the metal ball to a specific destination, etc.) by playing pre-recorded sounds and flashing LEDs This toy is similar to Rubiks Rock&Roll maze: Previous experience in circuit design, software & hardware to manufacture interactive consumer products is desired. Contact me for more details.
Skills: Circuit Design Audio Engineering Electronic Design Embedded Systems
Fixed-Price - Expert ($$$) - Est. Budget: $2,000 - Posted
We need a schematic for a digitally controlled variable power supply that can switch between AC and DC and can switch polarity for DC voltages. Needs to be stable and precise. Voltages need to vary from 0 to 30V, and 0 to 5 amps. This needs to all be controlled by a Raspberry Pi 3. We can handle all the programming - just need the circuit design.
Skills: Circuit Design Electrical engineering