As shown in the figure below, if there is no resistor R3, then when the voltage at point A (i.e. Vin) is greater than (VT1+Vbe), the PNP will be turned on. If resistor R3 is added now, the voltage on ...
I want to do some math questions for the postgraduate entrance examination. Which postgraduate entrance examination tutor can explain the real questions in a detailed and easy-to-understand way?...
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This afternoon 14:00-15:00Live AgendaApplication of wireless MCU products in the smart home industry- Introduction to TI's products in the field of wireless MCU- Introduction to su...
[color=#333333][font=Arial]The bottom row is connected to GND, and the others are connected to IO. When scanning the keys, set the first row to 0, scan the first column, set the second row to 0, scan ...
The Cortex-M3/M4/M7 core has a DWT unit (Data Watch and Trace Unit), which contains a clock cycle register with the same frequency as the CPU clock. IAR EWARM's C-SPY debugging system implements a 64-...
After receiving the X-NUCLEO-IKS01A3 kit, I have been searching and downloading materials, reading relevant manuals and analyzing codes. I used the STM32F401RE development board and tested it under th...
BMW has filed a patent describing a technology that projects rear-view mirror onto a portion of the front window. Automakers are stuffing more and more crazy technology into their cars to attract b...[Details]
It was previously revealed that the new AirPods Pro will have a significantly changed design. Now there is news that Apple will completely cancel the "earphone handle" design of the existing pr...[Details]
The purpose of wireless charging is to charge batteries. If you don't understand batteries, don't talk about charging, let alone wireless charging. If you want to understand wireless charging, you m...[Details]
According to a report by 91mobiles, Xiaomi's POCO M4 Pro 5G is one of the highly anticipated POCO smartphones. It is expected to be released in the coming weeks. However, the upcoming POCO smart...[Details]
JDI (Japan Display), the only purely Japanese-owned display manufacturer, is rumored to enter the OLED market in 2021, while targeting Apple Watch orders. However, due to the financial crisis, JDI wi...[Details]
According to Science and Technology Daily, the team of Professor Wang Xinran from Nanjing University and the team of Professor Wang Jinlan from Southeast University have collaborated to achieve centi...[Details]
In recent years, servo motor control technology is developing in three directions: AC, digital and intelligent. As the actuator of CNC machine tools, servo systems integrate power electronic devices, ...[Details]
In modern portable smart instruments or handheld devices, Chinese human-machine interface has become a de facto industry standard. Graphic dot-matrix LCDs that can display Chinese characters and sm...[Details]
It is learned that the Ziguang Hengyue project is expected to complete the upper main structure by the end of September and strive to be delivered for use before the end of 2020. It is reported tha...[Details]
Last month, there was news that vivo is about to launch its own ISP chip, which may be installed in the vivo X70 series, which will be released in September this year. Vivo has not responded yet. I...[Details]
Everyone must be familiar with the household appliances such as flashlights. However, facing the products with similar appearance and single variety on the market, do you think you should do someth...[Details]
Mr. Chen, who lives in Jiangbei District, recently planned to replace his old air conditioner with a new one. However, to his surprise, almost all brands on the market were on sale: Gree Shuxuan 1.5-...[Details]
0 Introduction
The electric energy metering system is a metering instrument for measuring the amount of electric energy consumption, and its technical requirements are very high. It requires no...[Details]
Power management generally refers to issues related to powering a circuit board. Issues include: Selecting various DC-DC converters to power the board Power supply sequencing/tracking Voltag...[Details]
Abstract: This paper analyzes the internal circuit functions and performance characteristics of the L64724 digital video satellite decoding chip produced by LSI Company, and gives the internal s...[Details]