Projects and Fun
For those of you who are not familiar with Yotaphone 2, it is an Andriod phone with two screens (one is LCD and one is e-ink) developed by Russia engineers. I’m always a fan of e-ink products. Nowadays we just watched too much LCD screens. Yotaphone 2 was about several hundreds dollars when it came […]
Dell inspiron 15 was my first laptop in my life, it was about 5 years old now. At one time, i encountered the classical dell problem “7 beeps”. Basically when you turn on the laptop, the screen is not going to be on, and the machine beeps seven times. From Dell’s specification, this problem is […]
Have you ever experienced the problem with iPhone battery? I have my iPhone 5 for almost three years, and the batter life keeps decreasing. Finally, I can’t stand it and try to find a solution. And it turns out it’s not hard to replace the battery by yourself. (Changing battery by an Apple Tech can be […]
Bose QC15 turns out to be a great headphone, especially in the noise cancelling area. When I was doing experiment in a lab, the sometimes I unplug the wires and just use it as a noise-cancelling headphone and I feel so free! Then what if I make a Bluetooth connection to the qc15? It turns […]
For this passage, I’m going to introduce the most basic dc-dc converter topology – Buck Converter. Some people also call it the step-down converter. Like its name shows, it steps down the dc voltage from a higher value to a lower value. This is the most basic circuit diagram of buck converter(from Wikipedia). It consists […]