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Why plug the vias of the PCB?
Conductive hole Via hole is also known as via hole. In order to meet customer requirements, the circuit board via hole must be plugged. After a lot of practice, the traditional aluminum plugging process is changed, and the circuit board surface solder mask and plugging are completed with white me...Read more -
Misunderstanding 4: Low-power design
Common mistake 17: These bus signals are all pulled by resistors, so I feel relieved. Positive solution: There are many reasons why signals need to be pulled up and down, but not all of them need to be pulled. The pull-up and pull-down resistor pulls a simple input signal, and the current is less...Read more -
Continue from Last Chapter: Misunderstanding 2: Reliability Design
Common mistake 7: This single board has been produced in small batches, and no problems have been found after a long time of testing, so there is no need to read the chip manual. Common Mistake 8: I can’t be blamed for user operation errors. Positive solution: It is correct to require the user to...Read more -
Electronic engineers often make mistakes (1) How many things have you done wrong?
Misunderstanding 1: Cost saving Common mistake 1: What color should the indicator light on the panel choose? I personally prefer blue, so choose it. Positive solution: For the indicator lights on the market, red, green, yellow, orange, etc., regardless of size (under 5MM) and packaging, they have...Read more -
What to do if the PCB is deformed
For the pcb copy board, a little carelessness may cause the bottom plate to deform. If it is not improved, it will affect the quality and performance of the pcb copy board. If it is directly discarded, it will cause cost losses. Here are some ways to correct the deformation of the bottom plate. ...Read more -
A small trick for multimeter testing SMT components
Some SMD components are very small and inconvenient to test and repair with ordinary multimeter pens. One is that it is easy to cause a short circuit, and the other is that it is inconvenient for the circuit board coated with an insulating coating to touch the metal part of the component pin. Her...Read more -
Analysis of electrical faults in good times and bad times
In terms of probability, various electrical faults with good and bad times include the following situations: 1. Poor contact Poor contact between the board and the slot, when the cable is broken internally, it will not work, the plug and the wiring terminal are not in contact, and the components ...Read more -
Characteristics and judgment of resistance damage
It is often seen that many beginners are tossing on the resistance while repairing the circuit, and it is dismantled and welded. In fact, it has been repaired a lot. As long as you understand the damage characteristics of the resistance, you don’t have to spend much time. Resistance is th...Read more -
pcb in a panel skill
1. The outer frame (clamping side) of the PCB jigsaw should adopt a closed loop design to ensure that the PCB jigsaw will not be deformed after being fixed on the fixture; 2. PCB panel width ≤260mm (SIEMENS line) or ≤300mm (FUJI line); if automatic dispensing is required, PCB panel width×length ≤...Read more -
Why spray paint on the circuit board?
1. What is the three-proof paint? Three anti-paint is a special formula of paint, used to protect circuit boards and related equipment from environmental erosion. The three-proof paint has good resistance to high and low temperature; it forms a transparent protective film after curing, which has ...Read more -
Common sense and methods of PCB inspection: look, listen, smell, touch…
Common sense and methods of PCB inspection: look, listen, smell, touch… 1. It is strictly forbidden to use grounded test equipment to touch the live TV, audio, video and other equipment of the bottom plate to test the PCB board without an isolation transformer It is strictly forbidden to ...Read more -
electrically conduc- tive printing ink notes
According to the actual experience of ink used by most manufacturers, the following regulations must be followed when using ink: 1. In any case, the temperature of the ink must be kept below 20-25°C, and the temperature cannot change too much, otherwise it will affect the viscosity of the ink and...Read more
