H15Z15 Board circuit !!!!!!!
2015-07-04 11:57
, printed-circuit-board (PCB) layout is often one of the last steps in the design process.
2015-01-23 11:01
1.PCB(Printing CircuitBoard)材料:印刷线路板,是由覆铜层压板制成,常用的覆铜层压板是覆铜酚醛纸质层压板、覆铜环氧纸质层压板,覆铜环氧玻璃层压板、覆铜环氧酚醛玻璃布层压板,覆铜聚四氟乙烯玻璃布层压板和多层板用环氧玻璃布等。环氧树脂与铜箔有很好的粘合力,且用环氧树脂做成的板子可以在260℃的锡炉中不起泡,也不容易受潮,故此种材料制作成的PCB应用较多。超高频的PCB最好使用覆铜聚四氟乙烯玻璃布层压板。在要求阻燃的PCB中也加入了一些阻燃树脂材料。2.PCB(Printing CircuitBoard)板层:(以四层板为例)silk screen (Top overlay): 丝印层solder Mask (Top/Bottom): 阻焊层Paste Mask (Top/Bottom): 锡膏层Top:顶层是元件层Bottom:底层是焊接层Drill Guide(Drill Drawing):钻孔层Keep out layer:禁止布线层,用于设置PCB边缘Mechanical Layer:机械层用于放置电路板尺寸Multi Layer: 穿透层Vcc Layer:中间电源层Gnd Layer: 中间地层
2015-12-09 12:06
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AsynchronousvsSynchronous Circuit DesignMainly useCombinationalLogic to do the decoding–Address
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variety of digital calibration parts enables quick automated testing and adjustment.Calibration Circuit
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lan circuit application<br/></font><br/><br/>
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