A while ago I stumbled on an interesting project over on the Technoblogy – an ATtiny85 continuity tester. I found the idea interesting, and decided…
I own an action camera – the Yi 4K – and I am very satisfied with it. However, even though it has longer battery life…
Modern LEDs have enormous efficiency – up to 40 % – but this still means that if you mount a 5 W LED on a…
If you ever designed your own printed circuit board, you might have wondered “how thick does this trace needs to be?” or “how big this…
You probably know that charging lithium batteries isn’t particularly easy. But if you have just a single cell, you can get an IC to do…
I use lithium batteries a lot. However, they are not the easiest to use – you need a dedicated charging IC, complicated protection circuitry, boost…
A few months ago, my watch broke. Instead of buying a new one, I decided to try to build a watch myself. Since I am…
I work with a lot of 18650 cells. And since I also test them a lot, I obviously need a good battery holder. So I…
Recently I was looking for a good and precise digital multimeter to buy, and the Brymen 867, a 50000-counts handheld DMM, immediately caught my eye.…