This project shows how to build an ESR (equivalent series resistor) meter using common available components. ESR meter measures the equivalent series resistance of the capacitor, almost independently of its capacitance, so you can easily determinate if a capacitor is damaged or not.
An Equivalent Series Resistance Meter – [Link]
This project is a multicolored LED light based on CD4093. Adjusting the brightness of each group is provided by a generator whose frequency is fixed but whose duty cycle (temporal relationship between high and low) is variable. It consists of a fixed frequency oscillator and variable duty cycle for each of three colors. Each oscillator operates independently, which helps determine the degree of brightness of each red, green and blue.
Multicolored LED with CD4093 - [Link]
This is a really impressive electronics workbench with control board. Check additional photos on the link below.
Electronic Workbench with Control Board - [Link]
This project is a VGA tester using a Attiny2313 running at 20MHz. This device can be used to test VGA monitors. Check schematic and source code on the link below.
VGA tester using Attiny2313 – [Link]
Chris writes: [via]
I stumbled upon this large collection of senior projects at Purdue and thought that there might be something you might like. These are great because they are fully documented projects. Its good to use to get a fresh idea or new outlook on a current project.
Purdue university ECE477 projects – [Link]
A friend gave me a Gigabyte EP35C-DS3R motherboard, that had succumbed to the dread ‘infinite reboot’ issue. The Interwebs reported this was usually a bad bios, so I decided to re-flash the bios using the great write-up here.
Bus Pirate and Flashrom save a motherboard – [Link]
Mike Lu used the four unused wires on one of the RJ45 Ethernet connectors to add serial communication on his RT-N12 router. This allows him to use the serial port for debugging and still use that port for network connection. He used a circuit to output the correct serial signals and connect them to the unused RJ45 pins. Then he used a special adapter to separate the RS232 signals from ethernet. This allow him to use the serial connection without modifying the router case. [via]
Adding a serial port through an RJ45 connector - [Link]