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
What aspects of PCB have an impact on PCBA: one, PCB board surface dirty, two, white slag, three, PCB deformation
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
PCBA processing common adverse phenomena: 1, warping, 2, short circuit, 3, offset, 4, missing parts, 5, air welding
Design methods to reduce stray capacitance of PCB: 1, remove the inner stratum, 2, use the Faraday shield, 3, increase the space between adjacent trace lines, 4, minimize the use of holes
PCBA processing of aluminum substrate manual soldering wire points for attention: first, pay attention to the welding temperature, two, select the appropriate raw materials, three, with the iron head is harmful to spot welding force
PCB circuit board fault detection methods: 1, determine the fault location, 2, detection equipment, 3, visual and physical detection, 4, special detection components, 5, on the circuit board for detection, 6, low voltage measurement
New design PCB board to find the fault method: 1. Voltage measurement method, 2. Signal injection method, 3. See, hear, smell, touch
Because the printed circuit board has high reliability, high density, strong design, strong production and other unique advantages, a good quality electronic equipment, largely depends on its PCB quality.
Two, the advantages of metal substrate: 1, thermal expansion, 2, heat dissipation 3, dimensional stability, 4, a wide range of applications
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