At present, there is almost no complete set of detection equipment for multi-layer coil short circuit on the market, and most of this work still relies on manual completion. PCB board with large aperture is manually put the board on the detection equipmen
The switching power supply contains high frequency signals. Any printed line on PCB can play the role of antenna. The length and width of printed line will affect its impedance and inductive reactance, thus affecting the frequency response.
The process of PCB resin plugging includes drilling, electroplating, plugging, baking and grinding. After drilling, the hole will be plated through, and then the resin will be plugged and baked.
In the input and input circuits of the LED switching power supply, each circuit is composed of three main components, which are filter capacitor, power switch or rectifier, inductor or transformer.
usually higher than the solder melting point (183°C)50°C~60°C in most cases refers to the temperature of the solder furnace actual operation, the welded PCB solder joint temperature is lower than the furnace temperature, this is because of the PCB heat ab
SMT processing plant should first establish and check the anti-static basic engineering, such as ground wire, floor mat, table integration, environmental anti-static Wang project
Methods to resolve printing errors in the repair process: 1. Printing speed, 2. Printing method, 3. Scraper type, 4. Scraper adjustment
In the layout of circuit modules, on the one hand, it is necessary to pay attention to the clock circuit and crystal oscillator circuit to reach the target through the shortest path.
In low-frequency circuits, where the signal frequency is less than 1MHz, the inductance between the wiring and components can be ignored, and the voltage drop generated on the resistance of the ground circuit has a great impact on the circuit, so the sing
The thickness of PCB board should be determined according to the function of PCB board, the weight of the mounting components, the specifications of PCB board socket, the outline size of PCB board and the mechanical load to be borne.
In order to suppress the cross talk between the printed circuit board wires, in the design of wiring should be as far as possible to avoid long distance equal wiring, as far as possible to open the distance between lines, signal lines and ground and power
Under the clock oscillator circuit, the special high-speed logic circuit should increase the area of the ground, rather than other signal lines, so that the surrounding electric field tends to zero.
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