I want to use transistors as switches, and I chose 9012. The circuit diagram is shown in the figure. Theoretically, when KEY2 is connected to a high level, the transistor is not turned on. When connec
[align=left][size=4][color=#000000] Today, with memory and pin counts increasing, we sometimes hear people ask why we continue to develop and release microcontrollers (MCUs) with as little as a few ki
I have tested the board under low voltage before, but this time I will test it under high temperature. Since I have left school, the conditions are limited and I cannot reach the manual limit temperat