2200mAh 18650 Li-ion Battery for Power Tool: Could Be Better.
This story began when an acquaintance brought me a cordless drill for repair. He bought it on sale when a store was closing. The warranty has expired, and it won't work. When I opened it up, I found that one of the batteries had died. Then batteries for power tools showed up on the ChinaBay website—yes, that's exactly what they were called: Battery for Power Tool. I couldn't just pass them by, so I ordered one for testing. Read on for the rest of the story, the test results, and how I put it to use.
A Clock That Doesn't Tick
13-12-2014, 10:23
I'm almost certain that many seasoned radio amateurs recognized the title of an article published way back in 1988. Back then, these electronic clocks were sold as kits for home assembly and cost quite a lot: 16 rubles (and the most interesting thing was that the display alone cost even more). Many people probably got into building these clocks and tinkering with them, and I was no exception. If you're interested, read on—I think you'll like it.
