Circuit Design Jobs

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Fixed-Price - Expert ($$$) - Est. Budget: $2,000 - Posted
I'm looking to create an all in one VR device similar to this: Looking for someone that can create the internals of the device, should be similar specs to the link above. This device will run Android. Basically looking to put the internals of a high end android phone into an all in one VR headset. If you're a product designer too that's even better.
Skills: Circuit Design Electrical engineering
Fixed-Price - Intermediate ($$) - Est. Budget: $100 - Posted
My company is looking for writers with experience in the fields of electrical engineering and printed circuit boards. We are a PCB shop that specializes in the design, manufacturing, and assembly of PCBs. We are looking for technical writers who can write technical content and articles.
Skills: Circuit Design Electrical engineering Electronic Design Electronics
Fixed-Price - Expert ($$$) - Est. Budget: $50 - Posted
Hi, I am looking for a person who can design a Circuit to control the direction of the motor driving. There is a frame which is moved by motor-1. When this frame is moving above the ground, I need to keep a safe distance from the ground. For that another motor-2 is attached on top of the frame. Based on the height from the ground this motor-2 has to lift up-or-down the frame. You can use sensors or other parts to get the distance of the frame from ground. Main matter is I need to change the safe distance parameter (some times it is 10", 12", 14"....)
Skills: Circuit Design Electronic Workbench Electronics Integrated Circuits
Fixed-Price - Intermediate ($$) - Est. Budget: $30 - Posted
Looking for someone with experience in building circuits. They have to be able to read the circuit and completely build it according to the size specifications as well as any substitutions made.
Skills: Circuit Design
Fixed-Price - Expert ($$$) - Est. Budget: $400 - Posted
We have a newly designed PCB board without embedded firmware. The board has (3 x FLASH ICs, capacitive TOUCH screen, MicroSD, Ethernet, power management for battery and POE, interface for WiFi or GSM module, NFC Mifare … etc.) we’re using Renesas MCU Rx Family (RX62N) – part number R5F562N8BDBG. For embedded software, we’re using Segger RTOS and we already did build a full operating firmware for another PCB board using almost same parts (modules). However, our electronic engineer has changed the interface Pins between the MCU and the modules (NFC IC, MicroSD, IC Flash, … etc.) which is using the following interfaces (SPI, UART, I2C, and GPIO). We need to reconfigure our libraries (SPI library, UART library … etc.) to work with the new board. Because we don’t have enough SPI and I2C interfaces in the MCU, we may need to use soft SPI and I2C. the following is list of the interfaces need to be configured/written to let the firmware work with the new board: - SDRAM IC interface - MMC Memory Card IC (SPI interface) - Capacitive Touch (I2C interface) - Serial Flash IC x 3 (all in one SPI interface with chip select pin) - EPROM IC (I2C interface) - LED Driver IC - RTC IC (I2C interface) - Configure 6 UARTS to communicate with other modules. - ADC for battery level. - RFID IC (SPI Interface) - Buzzer, Relay, LED, etc. - HID IC (UART Interface) - USB Host interface - POE IC (AS1834) I2C interface
Skills: Circuit Design C Computer Engineering Electrical engineering
Fixed-Price - Expert ($$$) - 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