So, you know when you are tired or bored and you go to strange places online? I somehow found this flashlight online and from the picture, you can see many high power LEDs + many high power batteries + adequate cooling => awesome light output. The price at that time was ~50$ so I ordered because it seemed I get a lot for my money.
I got the perfect washing machine in my early 20s when I was single. It has some predefined programs, no display or any other complicated features. I was using mostly “power + quick wash”. Now, in my early 30s, my wife uses programs that take hours and staring them after work means the cycle would be done after midnight. So, let’s make that hunk of metal controllable from the Internet.
Once in a while I compare the performance vs cost benefits of cloud vendors. In this case I just need to compare virtual machines, which is by far the most used service out there, so I guess sharing these results should be useful to many people.
Sometimes we need a negative voltage rail. There are several ways to obtain that but most likely the easiest is to use a charge-pump IC with only two capacitors.
Because the datasheet doesn’t always paint a clear picture I decided to order a few and do my own testing for the things I care about (current, ripple, switching frequency).
MicroSD cards are everywhere these days but since these days it’s possible to film in UHD or in high speed with action cameras and phones it’s actually very important how quick these cards are at writing this data.