What are the inspection conditions and standards of PCBA circuit board?
Why do PCBA circuit board inspection: PCBA inspection is a link in the whole production process of PCBA processing, is an important means to control product quality
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PCB design differential wiring requirements and operating skills
PCB design differential wiring operation skills: 1, activate the wiring instruction, 2, support single line Mode, 3, in the layout of small space position differential wiring, can switch to the Neck Mode, 4, according to the wiring needs to select the app
PCB copy board push-back schematic method detailed
PCB copy board use: The purpose of PCB copy board is to learn the latest foreign electronic circuit design technology, and then absorb the excellent design scheme, and then used to develop and design more excellent products
Copper application points for PCB design
Copper coating on PCB board, if the grounding problem is handled well, is certainly "more advantages than disadvantages", it can reduce the signal line backflow area, reduce the signal external electromagnetic interference
PCB board temperature maximum how many degrees?
The temperature of PCB board is related to the temperature of its raw materials, solder paste and surface parts. Usually, the highest temperature resistance of PCB board is 300 degrees, 5-10 seconds; Over lead-free wave soldering temperature is about 260,
Why do most PCB multilayers have even layers?
High frequency PCB design layout points to note: (1) With high integration and high density PCB design and wiring, (2) the lead bending between the pins of the high-speed circuit device should be less, (3) the lead between the pins of the high-frequency c
What harm does PCBA processing use expired PCB board have?
PCBA processing using expired PCB board three hazards: 1, PCBA processing using expired PCB may cause oxidation of PCB surface welding pad, 2, PCBA processing using expired PCB may cause moisture absorption and burst board, 3, PCBA processing using expire
How long is the shelf life of PCB board?
The importance of PCBA processing plant to select the SMT placing machine is as follows: first, the type of components that can be affixed, second, the adjustment of the placing machine
Can SMT surface mount technology speed up PCBA processing?
SMT surface mount technology has the following 5 steps: 1. PCB production - this is the actual production stage of PCB with solder points; 2. Deposit solder on the pad to fix the assembly to the plate; 3. With the help of the machine, the components are p
The cause of formation of tin beads in PCBA processing
The reasons for the formation of tin beads in PCBA processing: 1. When the PCB board leaves the liquid solder, it is very easy to form tin beads, 2. The second reason for the formation of tin beads is the release of volatile substances in PCB board and so
Shielding methods in high speed PCB design
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
PCBA manufacturers detailed circuit board components testing skills
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
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