Circuit Design Jobs

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Fixed-Price - Expert ($$$) - Est. Budget: $2,000 - Posted
A) Mechanical Constraints/Geometry Board Dimensions: The control board should meet the geometric constraints as defined. Geometry of the circuit board need to accommodate the concentric circular cut out inside the control board geometry. B) Connector for the control board Geometry: The connector can be square/rectangular in shape. The mating part for the connector can be mated with connector in only one manner/direction. The height of the connector need to be less than equal to 0.25”. If that is not achievable then the max. height should be 0.5”. Connector Availability: Readily available connector (example from Molex, 3M etc. – TBD) – choice will be dictated by cost of the connector Number of pins: 5 (4 inputs and 1 output) Alternatively: No Connector on the board with wires soldered directly to the board. How much does this impact pricing? If the number of pins increase, it would be potentially more cost effective to adopt the approach of a connector than soldered wires. C) Control Board Operation Control Voltage: 0-5 V and PWM signal. Optional: 4-20 mA signal (optional) – dip switch Total number of Inputs: 4 (Supply Voltage range (10 V-38 V), Common Ground, Control Voltage (0-5 V), Motor Direction of Rotation-F/R). Discuss:+5.0V supply from board: power supply for speed control potentiometer and so the customer does not require a separate voltage source for controls. Total number of Outputs: 1 (Tach Out) – Pulse per rev, signal options available Motor Normal Operating Current Range: 0 – 4 amps Motor Max. Current / startup current: 4.5 amps Maximum electronic component temperature (ex: driver chip): max. 125 C, TBD RPM range: 500 rpm - 4000 rpm @ given speed and given torque Feedback: Open Loop Control with selectable closed loop control (RPM fluctuations are within 1 rpm of set point, ± 1 RPM) Set point RPM Fluctuations at constant load: Within 1 rpm of set point, Tolerance ± 1 RPM Motor control scheme: 0 – 5VDC PWM control signal linearly mapped to 500-4000 RPM speed. (Discuss on Open loop and closed loop with Control Resources) D) Control Board Intelligent Protection Over current protection: The control board shuts itself down if current exceeds 4.5 amps (Optional 3.5 amps). Reset current? Over Voltage and Under Voltage Protection If speed control is not required, supply voltage can be used in lieu of control voltage. Supply voltage acts as 5 V signal (10V-38V) Thermal shutdown: Design includes thermal shutdown at 125°C. Power to be cycled after cool down below 100°C to restart Fusing: Yes E) Regulatory/Environmental Operating Pump: -20 °C to 125 °C, 95% RH EMC/EMI: To be designed with best practices RoHS Compliant: yes Safety Standards: Designed to IEC standard 60950 Assembly Standards: Built to current IPC-A-610
Skills: Circuit Design Electrical engineering Integrated Circuits PCB Design
Fixed-Price - Intermediate ($$) - Est. Budget: $100 - Posted
Looking for an analog circuit designer to improve current schematic design and create an Eagle PCB file for a simple rechargeable BLE bracelet with a switch (no accelerometers, heart rate sensors, etc., only a BLE module, switch, and rechargable IC with battery). The project and further use will be explained upon application. This is a one time job as of right now. Applicant should be experienced with analog circuit design and be familiar with most recent releases in components for wearables.
Skills: Circuit Design Analog Electronics Eagle Electrical engineering
Hourly - Entry Level ($) - Est. Time: 3 to 6 months, 10-30 hrs/week - Posted
The Role: we’re looking to hire someone with great talent and experience to assemble online team of (2-4) electrical engineers and work closely with them and manage the over all project. Responsibility: Write online job postings and making decisions about hiring online team members Setting up goals and communicate our design vision Create tasks and assign tasks with deadlines to team members Follow up closely with engineers, suppliers to achieve the best possible product in terms of craftsmanship, cost, and engineering will staying as close to the design vision as possible. Create 15min scrum meeting everyday via Skype with team members to make sure everything is on track Solution and improvements oriented with great attention to details Collaborate with the fabrication team to complete prototypes when necessary
Skills: Circuit Design Altium Designer AutoCAD Bluetooth
Fixed-Price - Intermediate ($$) - Est. Budget: $100 - Posted
Provide all schematics and code to connect TiWi-uB1 to Arduino Uno. Device must: 1) TiWi-uB1 must receive power from Arduino Uno 2) Arduino Uno must obtain TiWi-uB1's MAC address on startup 3) Adjust the strength of BLE signal from TiWi-uB1 to lowest level TiWi-uB1 datasheet: https://www.lsr.com/downloads/products/330-0132.pdf
Skills: Circuit Design Arduino Electrical engineering PCB Design
Hourly - Entry Level ($) - Est. Time: 3 to 6 months, 10-30 hrs/week - Posted
We are a start-up working on building true wireless earbuds with a capsule that charges the earbuds wirelessly. At this stage of the development we have all the engineering docs of the product but more improvement is required, on the charging system and a few other things so we are able to start the mass-production. We are looking to hire Electrical engineer to work with our team to fix the charging issue and a few other things. more details will be shared after we hire.
Skills: Circuit Design Electrical Drawing Electrical engineering Electronic Design
Fixed-Price - Entry Level ($) - Est. Budget: $500 - Posted
Looking for few Electrical engineers who have experience of working with AutoCAD Electrical design software. The design process is: 1. Client gives the design drafters an IO list, instrument list, BOM, load list and they will put together the initial single line drawing, drive schematics and IO schematics. 2. The Client engineers will then review the drawings at each level.
Skills: Circuit Design AutoCAD Electrical Drawing Electrical engineering
Fixed-Price - Intermediate ($$) - Est. Budget: $100 - Posted
i need a Blue tooth motion controller to be built to work on mobile platform (android) Connection type is blue tooth and or dongle you must provide 1. Gerber File 2. Boom List 3. Prototype 4. Program file and method. 5. app 6. schematics
Skills: Circuit Design Android Arduino Bluetooth
Hourly - Intermediate ($$) - Est. Time: 1 to 3 months, 10-30 hrs/week - Posted
We have a unique device sensor type application. The device consists of one large capacitive sensor array similar to a large touch screen and a small control and interface board containing an ARM M3 controller and color TFT display which both controls the sensor array and displays the results. The engineer we seek must have good knowledge of capacitive sensing including projected self and mutual capacitive sensing techniques as well as C programming skills, experience with embedded design and pcb layout. The device is also battery operated and thus contains a small buck/boost regulator and 500mA charger. We need someone with experience with microcontrollers, battery operated designs, TFT displays, capacitance sensing, pcb layout and prototyping.
Skills: Circuit Design Embedded C PCB Design
Hourly - Intermediate ($$) - Est. Time: 1 to 3 months, 30+ hrs/week - Posted
We are looking for an embedded C developer for 1-3 months *FULL TIME* embedded product development, to join our existing team. We need experience in STM32Cube as well as STM Standard Peripheral libraries on IAR platform. Please tell us if you have worked with this. The ideal candidate should be good at Embedded C programming and Microcontroller peripherals like BootLoader, I2C, UART, GSM, GPS, Iridium, Low Power, USB, WiFi, Accelerometer, SPI and also FreeRTOS as its RTOS. The candidate should also be a strong team player capable of working in a team and providing robust code that can integrate well with the rest of the product. Experience with STM32L4/F4 or ARM Cortex-M is necessary. The development environment is IAR IDE. Please specifically describe your experience with IAR and stm32 peripherals in your bid. Please apply only if you can spend 30-40 hours per week on this project with a start date of around a week from the time we select you. Also you must have quick response time and be ready for urgent troubleshooting whenever needed over skype. Prefer to interface with technical individuals and not companies. If you are part of a company, please provide your individual credentials and apply directly.
Skills: Circuit Design Embedded C Embedded Systems GPS Development
Fixed-Price - Expert ($$$) - Est. Budget: $70 - Posted
I have PCBs used in wireless door chime (both the transmitter and receiver). I'm looking for explanation of how this circuit works as well as possible improvement. I'm expecting a schematics (either of the existing one or modification). Attached is pictures of the pcbs
Skills: Circuit Design Electrical engineering