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      Apple’s iPhone 13 series was officially launched on September 24. Many users have already received and started using the iPhone 13 series phones. 　　Today, some users reported that there were pr...[Details]

This is the circuit diagram of a stereo power audio amplifier using power IC LM4756. This IC is capable of providing dual output channels with 7W for each channel. Like other audio amplifier circui...[Details]

introduction The stepper motor is a digital motor with advantages such as no cumulative error and high cost performance. It is widely used in life and production. Unlike other motors, stepper motors...[Details]

      Integrated voltage stabilizers can be roughly divided into three-terminal fixed type, three-terminal adjustable type, multi-terminal adjustable type and single-chip switching type according to ...[Details]

1 Introduction One of the core issues of current transformer differential protection is how to distinguish between magnetizing inrush current and internal short-circuit current . In recent yea...[Details]

On September 1, the People's Government of Hebei Province issued the "Several Measures for Promoting High-Quality Development of Private Investment in Hebei Province", which mentioned: Support...[Details]

　　1. Use the multimeter's DC gear to test at a gear greater than the battery's rated voltage. For example: test a dry cell battery of 9V or 1.5V using the DC10V or DC2V gear. 　　2. After selecting t...[Details]

White LEDs can be connected in series or in parallel, and both solutions have their own advantages and disadvantages. The disadvantage of the parallel connection is that the LED current and brightn...[Details]

Audio amplifiers for high-power portable speakers, such as cart speakers, are often powered by lithium-ion batteries, which can range from a single cell to several cells in series. Designers often ...[Details]

       According to foreign media LetsGoDigital today, the State Intellectual Property Office has disclosed a design patent submitted by Wingtech Communications Co., Ltd. The content of the patent is...[Details]

introduction In industrial control sites, it is often necessary to collect multiple channels of field data, such as voltage, current, temperature, humidity, air pressure, etc. The data collector conv...[Details]

Consumers are increasingly using their phone speakers to watch and share videos on social media, make video calls, or listen to podcasts and music while multitasking, a trend amplified during the COV...[Details]

There are two concepts of priority in STM32 (Cortex-M3) - preemptive priority and response priority. Some people call response priority "sub-priority" or "sub-priority". Each interrupt source needs t...[Details]

The electricity price system is a general description of the composition and structure of electricity prices. With the continuous deepening of electricity price reform, my country's electricity pri...[Details]

Single instance: For example, when calling a timer in an FB block, if a single instance is selected, the background data block of the timer is generated in the system block, that is, it does not ex...[Details]