I built a stylish energy-efficient desk lamp, entirely from scratch. I have always enjoyed Art Deco and Machine Age industrial styling, and was inspired to use it for the lamp when my son and I were watching Batman, the Animated Series. A desk lamp worthy of Wayne Manor was in order.

One of my contributions to Project Gutenberg was proofreeading and formatting of the Radio Amateur's Handbook by Frederick Collins, 1922. You can read the entire book here, including all illustrations.

Older books like this are great for learning from. Since everything about radio was new to everyone, the book does not assume that you have a lot of knowledge to start with, and explains everything starting with the basics.

I have an old laser printer which does not have a decent standby power-saving mode.  I built a computer-controlled power switch for it, so the computer turns on the printer when there is a print job, then turns it off again later.