solution
the gold plating process is more expensive than the gold plating process (higher gold content), so there are still a lot of low cost products using the gold plating process (such as remote control board, toy board).
Контрактное производство электроники под ключ в Китае
Шэньчжэнь, район Баоань, улица Фуюн, улица Фуцяо, район 3, промышленный парк Лонгхуй 6
pcb diode
In addition to the gold-plated copper foil at the lower left corner in the figure above, BGA packaging also uses the missing corner and concave points and silk screen dots to indicate the direction of the first foot.
pcb silver immersion
Silver immersion does not have the good physical strength of electroless nickel/gold plating because there is no nickel underneath the silver layer. In addition, silver immersion has good storage, after several years of assembly will not have a big proble
SMT patch processing basic introduction
Pin tin absorption can also be reduced by a flux with a slower wetting rate and a higher active temperature, or by a solder paste with different proportions of Sn/Pb to block melting.
What is the function of PCB board printed circuit surface plating process
the current motherboard, memory and graphics card and other equipment "gold finger" is almost all made of tin material, only part of the high performance server/workstation accessories contact point will continue to use gold plating, the price i...
PCB board, the rules are very particular
Otherwise, you may be forced to make modifications and redesign your PCB stack structure.
The change of circuit board material with temperature will lead to the change of design Dk and phase Angle
Although both microstrip line and GCPW can be modeled and simulated to predict circuit performance, GCPW is more difficult to process and affected by processing at 77GHz frequency.
The effect of dielectric on Dk
these changes in Dk will introduce certain impedance errors when designing millimeter-wave transmission lines using computer simulation software.
What is a copper-based circuit board?
There are positive and negative sides, the white side is welded LED pin, the other side shows aluminum color, generally coated with thermal coagulation and thermal part contact. Ceramic substrate and so on.
The influence of wrinkle on circuit board machining
resulting in positioning (only for the large plate) or sporadic copper wire loss, but the stripping strength of copper foil near the stripping line will not be abnormal.
CMOS devices and their circuits
From here, we also know that when NMOS works, there is current flowing from the power supply (VDD) to the ground (that is, from D to S). When the power supply voltage is constant, This current follows the voltage across the gate .
4 layers of circuit board processing
it is difficult to accommodate the software used for debugging procedures, so to debug the microcontroller software, the use of microcontroller simulator.
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