Before designing a multilayer PCB, the designer needs to first determine the structure of the circuit board according to the size of the circuit board, the size of the circuit board and electromagnetic compatibility (EMC) requirements, that is, to decide whether to use four, six or more layers of the circuit board. After the number [...]
Circuit design is a basic skill for an electronic engineer. However, even if the circuit schematic diagram is perfect, if the common problems and challenges are not understood and prevented in the process of converting to PCB circuit board, the whole system will still be greatly compromised and will not work at all in serious [...]
1. Pay attention to the definition of pin and package name when making the schematic library When making the package library, pay attention to the corresponding principle diagram pin; If the pins do not correspond, the components will be isolated when the PCB diagram is obtained. 2. Any routing on the PCB will cause time [...]
The basic process of the circuit board can be divided into three steps: circuit schematic design, generation of network table, printed circuit board design. There are specific requirements for both device layout and wiring on the board. For example, input and output wiring should be avoided parallel to avoid interference. It is necessary to add [...]
I. board checking method: 1. Observation method: there is no burning, burning, blister, plate surface broken line, socket corrosion. 2. Table measurement: whether the resistance of +5V and GND is too small (below 50 ohms). 3. Power on check: for the clear has broken board, can slightly increase the voltage 0. 5-1v, use the IC [...]
With the development of science and technology, modern electronic products have penetrated into our daily life. Without electronic products, our life will become very inconvenient, but in these electronic products, we will see the figure of gold. What does gold do in electronics? Why gold in electronics? Because the chemical property of gold is very [...]
Why does PCB need to use three - proof paint? Anti-corrosion paint, also called electronic circuit board PCB applying, only the oil, moisture-proof paint, anti-corrosion coatings, waterproof glue, insulating paint, anti-corrosion paint, paint, dust, paint, salt mist protection paint anti-corrosion, only the paint, glue, etc., used anti-corrosion paint PCB circuit board with waterproof, moisture-proof, dustproof [...]
Rx is the resistance, there's a lot of resistance in the circuit diagram, R1, R2... Cx is non-polar capacitance, anti-interference capacitance of power input IC integrated circuit module Ux is IC Kx is??? The component library definition varies from vendor to vendor Tx is the test point (factory test) Spk1 is a Speaker. Qx is [...]
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 [...]