LDO Resistor Divider Chart
Interactive chart showing the resistor divider options for setting the output voltage of adjustable LDOs.
Georgi
Standard R/C Values
Handy table including the standard E24 and E96 series of resistor/capacitor values. Also available as Python arrays.
Cheap Oscilloscope?
Is there such a thing like an affordable digital oscilloscope? It depends, but this little scope fits many entry-level requirements.
Pinyin with Tone Marks in Mac OS
Typing Mandarin Chinese Pinyin with tone marks in macOS is considerably easier using a custom keyboard layout.
YongBaiTech.com
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.