1.1 basic terms According to the definitions of IEC 60326 and GB2036, the meanings of printed circuit are as follows: On the insulating substrate, printed components or printed circuits formed according to the predetermined design and the conductive graphics combining the two are called printed circuits. A conductive figure formed on an insulating substrate and [...]
1. Copper foil adhesion refers to the adhesion force of printed conductor and welding plate on the substrate. The adhesion force is small, so printed conductor and welding plate are easy to be peeled off from the substrate. Circuit board factory check the copper foil adhesive tape, available to test for a transparent tape to [...]
In order to suppress noise ability, earthing and power of graphics should be parallel to the direction of data flow. Multilayer PCB may take several as shielding layer, power supply layer and ground layer can be regarded as shielding layer, note that the general ground inner or outer layer and the power supply design. Digital [...]
As the industrial transfer and upgrading, the implementation of the new labor contract law, the economic structure changes bring the rising cost of living in cities, and after 80, 90 staff and liquidity management difficulty, PCB manufacturers are experiencing more and more serious labor shortages and the challenge of rising labor costs, and then bring [...]
Part of the customers' miscalculation this type hole without copper as follows: 1, tin light deep plating (go) and poor ability of call tin bad; 2, abnormal PTH, hole didn't sink copper; 3, copper plated deep plating ability is poor. In the actual production, gradually thin hole without copper. Investigate its reason, nothing more is [...]
Basic flow science at first, this post is dedicated for profes sional simple study, single OUT, blind hole buried after have time continues: cutting - the inner line - lining etching - AOI - pressing - drilling - Kong Hua a copper - outer line - secondary copper outer etching - anti - words - [...]
Widely used for PCB, customization and cost control is an important industry characteristics: PCB's main function is to connect all kinds of electronic components, is also very wide application field. Great differences due to the numerous downstream industries, so the PCB industry has very strong customization features, participate in numerous manufacturers, leading to PCB supply [...]
In the repair process, the welding work is indispensable. Not only does it require that the components on the circuit board, and solder joints must be firm, smooth, so the stand or fall of welding technology directly affect the success of electronic production, so the welding technology is every electronic enthusiasts must master basic skills, [...]
High speed PCB, line is more than just connecting two points. As a qualified engineer, it is including resistance, capacitance and inductance of the hybrid knowledge carrier. During transmission line will be a reflection phenomenon, this must look at the size of the load end reflection depends on transmission line and load the Z Z. [...]
Transient Voltage suppression diode TVS (Transient Voltage Suppressors) is also called the Transient Voltage suppression diode breakdown diode, two-way, hereinafter referred to as TVS diode. Transient voltage suppression diode is in stabilivolt technology developed on the basis of a new device, the circuit symbols and ordinary zener diode, same appearance also with ordinary diode. The [...]