USB Voltage Protection Circuit
Budget: $30 – $250 USD
Design a circuit for a device that goes between a USB device and a computer that protects the computer for any shorts or excessive voltages that occur or come from the USB device. The USB device is a prototype device that is under development and as such at risk for shorts, reverse wiring, and over voltage across any of the power and communication lines (5 pins/wires).
A successfully designed circuit will include an electrical schematic, a description of how the circuit works and provides protection, and it will meet the following functional requirements:
Uses generally available through-hole (no surface mount) electrical components.
All electrical components are identified by a manufacturer's part number, and ideally by a recommended source / brand P/N when many suppliers exist and the performance of the component varies considerably among the sources.
The circuit begins with a USB A recetacle/female connector that the USB Device would connect to and ends with a USB A plug/male connector
Protects all five of the USB pins/lines (VCC, D-, D+, ID, GND) from over voltage, short circuit, reverse polarity, etc.
At least one LED provides indication of a successful power transfer connection. Any additional LEDs that can provide useful information would be a bonus.
The USB data capabilities (2.0, 3.0, ...) and performance, as well as the charging capabilities are not adversely affected by the insertion of the device between a USB Device and a computer (or powered USB hub).
You must sign a Freelance Contract with terms that state I own the complete rights to the circuit design you create, and you must keep the entire project confidential, and it limits the liability for both of us.
A successfully designed circuit will include an electrical schematic, a description of how the circuit works and provides protection, and it will meet the following functional requirements:
Uses generally available through-hole (no surface mount) electrical components.
All electrical components are identified by a manufacturer's part number, and ideally by a recommended source / brand P/N when many suppliers exist and the performance of the component varies considerably among the sources.
The circuit begins with a USB A recetacle/female connector that the USB Device would connect to and ends with a USB A plug/male connector
Protects all five of the USB pins/lines (VCC, D-, D+, ID, GND) from over voltage, short circuit, reverse polarity, etc.
At least one LED provides indication of a successful power transfer connection. Any additional LEDs that can provide useful information would be a bonus.
The USB data capabilities (2.0, 3.0, ...) and performance, as well as the charging capabilities are not adversely affected by the insertion of the device between a USB Device and a computer (or powered USB hub).
You must sign a Freelance Contract with terms that state I own the complete rights to the circuit design you create, and you must keep the entire project confidential, and it limits the liability for both of us.