Shielding method in high frequency PCB design: the twisted pair in data twisted pair can resist external interference and cross-talk between pairs through its own twisting at low frequency, but at high frequency, only twisting and merging can not achieve
Circuit board components testing skills: 1. Measure the polarity of each foot of the rectifier bridge, 2. Judge the quality of crystal vibration, 3. Unidirectional thyristor detection, 4. Polarity recognition of bidirectional thyristors, 5. Check the qual
Take a look at the PCBA OEM classification: 1. Technology-oriented, 2. Processing-oriented
What is the cause of PCB board broken line: 1, film process: 2, exposure process: 3, development process: 4, etching process: 5, electroplating problem: 6, improper operation
PCB board temperature resistance test method: In order to ensure the quality of PCB board, it is necessary to carry out temperature resistance test, usually the highest temperature resistance of PCB board is 300 degrees, 5-10 seconds; Over lead-free wave
PCB surface treatment process is identified by color: 1, gold, 2, silver, 3, light red
he system speed can be greatly reduced because of the increase of delay time caused by the delay of 2ns per 30cm line length of the common interconnect on the baseboard. Image shift register synchronization counter.
PCBA processing common adverse phenomena: 1, warping, 2, short circuit, 3, offset, 4, missing parts, 5, air welding
Keyou Circuit is a professional production of high precision multilayer circuit board, module gold circuit board, vehicle circuit board, traffic recorder,COB power supply, computer motherboard, medical circuit board.
In short, the technological parameters and conditions of copper plating must be strictly controlled to ensure that the thickness of the copper plating layer in the hole meets the requirements of the technical standard.
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Most copper crepe will occur in areas where the line density is different, especially where one side is designed to be large copper but the other side has a large empty area.