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PCB-dat/PCB-design-dat/PCB-design-basic-dat/PCB-design-basic-dat.md
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+
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+# PCB-design-basic-dat
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+
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+- 电源指示灯 - 用于 检测 电源状态 - [[LED-dat]]
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+
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+- 信号指示灯 - [[RS232-dat]] - [[RS485-dat]]
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+
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+- 信号灯 限流电阻 == 2K
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+
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+![](2025-12-30-15-00-00.png)
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+
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+
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+
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+
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+## ref
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+
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+- [[PCB-dat]]
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+
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+
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+# PCB-design-stack-dat
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+
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+- [[PCB-design-basic-dat]]
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+
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+
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+
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+## purpose
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+
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+- for the very limit space, specially the flat surface is limited, but the height is enough
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+
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+- round PCB
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+
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+![](2025-12-30-15-00-48.png)
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+
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+![](2025-12-30-15-01-39.png)
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+
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+
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+- [[battery-dat]] - [[battery-holder-dat]]
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+
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+## ref
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+
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+- [[PCB-dat]]
power-dat/battery-holder-dat/AA-battery-holder-dat/2025-12-30-15-02-43.png
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![](2024-09-22-00-21-47.png)
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+
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+## cylindar battery holder
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+
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+![](2025-12-30-15-02-43.png)
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+
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+
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+
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## ref
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- [[AA-battery-holder]]
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power-dat/battery-holder-dat/battery-holder-dat.md
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## 18650 battery holder
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![](2025-08-30-16-22-09.png)
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+
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+
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+
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+## ref
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+
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+- [[battery-dat]]
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