A friend of mine recently asked me to help recover data from an old hard disk that was barely readable. The file system was badly damaged, the disk could not be recognized by the OS at all. I managed to copy whatever data sectors were readable — but then, how do I recover the files? … Read more
In January 2022 a few friends and I formed a small running group in Shanghai. We set a goal to run 500 km each in the year! To keep track of progress I created the running distance chart below using amCharts. I hope it motivates people in our group to run more! We also have … Read more
Blinker modules to extend and visualize short pulses — useful for debugging embedded systems.
Understand the definition and use of typical and min/max specification in electronic component data sheets.
Handy trick for accessing unaligned data in C using a packed data structure to avoid manually loading or storing data byte by byte.
Interactive chart showing the resistor divider options for setting the output voltage of adjustable LDOs.
Handy table including the standard E24 and E96 series of resistor/capacitor values. Also available as Python arrays.
Is there such a thing like an affordable digital oscilloscope? It depends, but this little scope fits many entry-level requirements.
Typing Mandarin Chinese Pinyin with tone marks in macOS is considerably easier using a custom keyboard layout.
It took some time, but I finally have my own little company in Shanghai — and in the last week I set up a new web site for it. I hope this helps attract customers but in the process I also learned a lot about modern web design.