Circuit board damage of electric hoist will lead to no movement up and down, no fast and slow lifting, no fast and slow walking motor of electric hoist, no movement of left and right walking of electric hoist. Electric hoist up and down without action: open the walking motor electrical boxes, power plug, traveling motor [...]
Signal injection method Signal injection method is more troublesome than measuring voltage. In transmitting the signal source to the input end, we need to measure the waveform of each subsequent point in order to find the fault point from the waveform. Of course, tweezers can also be used to detect the input end, the practice [...]
What role does gold play in electronic products? Why is there gold in electronics? Because the chemical properties of gold are very stable, it is not easy to have chemical reactions with other things, including at a certain temperature of chemical properties are very stable, gold is used in electronic products, mainly because of its [...]
There are three situations of virtual welding on the circuit board: 1. Virtual welding between the element foot and solder, press the element foot protruding from solder welding edge with the screwdriver, the ability to move indicates virtual welding; 2. There is virtual welding in the middle of the solder, which occurs in electrical appliances [...]
Electronic equipment must be in accordance with the circuit schematic diagram interconnection, in order to achieve the predetermined function, if the connection error will lead to the entire circuit board is invalid, so the choice of reliability, technology and economy with the best connection, is one of the important content of circuit board design. There [...]
The Mark point, also known as the reference point, provides a common locatable circuit pattern for all steps in the FPC FPCB assembly process. Therefore, FPC FPC board Mark point is very important for SMT production. All SMT patch plates must have Mark points, and the specifications of Mark points are as follows: 1. The [...]
Looking ahead to 2019, the global PCB industry will continue to grow. With the vigorous development of 5G, automotive, Internet of things, artificial intelligence and other new applications, it will face more market opportunities and challenges. The high-frequency PCB for the rigid demand, PCB to achieve high frequency is the key to the high frequency [...]
1. Circuit and Pattern: the circuit serves as a tool for conducting between the original components, and a large copper surface will be designed as the grounding and power layer in the design. The line and the drawing are made at the same time. Dielectric layer (Dielectric) : used to maintain the line and the [...]
1. Ground connection problem? A system is often divided into a number of PCB, power supply, interface, motherboard, etc., the ground wire between the boards is often interconnected, resulting in the formation of a lot of loop, such as 2. Low-frequency loop noise problem? When the signal or power supply between the PCB boards is [...]
If wiring doesn't require an extra layer, why use it? Wouldn't reducing layers make a circuit board thinner? If the circuit board is less than a layer, is not the cost lower? However, in some cases, adding a layer may actually lower the cost. PCB board has two different structures: core structure and foil structure. [...]