@@ -22,6 +22,74 @@ time to complete: 7 mins
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+
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+ ``` mermaid
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+ flowchart LR
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+
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+ subgraph Power_Lines
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+ RAW[RAW POWER]
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+ DCDC1[DC/DC → 3.3V #1]
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+ DCDC2[DC/DC → 3.3V #2]
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+ DCDC3[DC/DC → 5.0V]
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+ DCDC4[DC/DC → Unreg #1]
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+ DCDC5[DC/DC → Unreg #2]
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+ RAW --> DCDC1 --> MAIN_PIC
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+ RAW --> DCDC2 --> COM_PIC
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+ RAW --> DCDC3 --> RESET_PIC
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+ RAW --> DCDC4 --> START_PIC
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+ RAW --> DCDC5 --> BURNER
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+ end
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+
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+ subgraph OBC_Module
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+ MAIN_PIC[MAIN PIC]
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+ COM_PIC[COM PIC]
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+ RESET_PIC[RESET PIC]
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+ START_PIC[START PIC]
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+ MAIN_FM[MAIN FM]
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+ COM_FM[Shared COM FM]
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+ MSN_FM[Shared MSN FM]
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+ MUX1[MUX 1]
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+ MUX2[MUX 2]
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+ end
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+
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+ MAIN_PIC -- SPI --> MUX1
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+ MUX1 -- SPI --> MAIN_FM
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+
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+ COM_PIC -- SPI --> MUX2
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+ MUX2 -- SPI --> COM_FM
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+
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+ MAIN_PIC -- UART --> COM_PIC
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+ MAIN_PIC -- UART --> RESET_PIC
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+ COM_PIC -- UART --> START_PIC
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+ RESET_PIC -- UART --> START_PIC
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+
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+ MAIN_PIC -- SPI --> MSN_FM
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+ COM_PIC -- UART --> OLD_TRX
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+ COM_PIC -- UART --> NEW_TRX
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+
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+ subgraph External_Components
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+ CPLD[CPLD]
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+ FAB_PIC[FAB PIC]
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+ MSN_BOSS[MSN BOSS]
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+ BURNER[BURNER CCT]
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+ UHF[UHF TRX]
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+ OLD_TRX[OLD TRX - ADDNICS]
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+ NEW_TRX[NEW TRX]
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+ end
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+
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+ MSN_BOSS -- UART --> MAIN_PIC
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+ CPLD -- UART --> MSN_BOSS
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+ FAB_PIC -- UART --> MAIN_PIC
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+ MAIN_PIC -- UART --> BURNER
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+ BURNER -- Power --> UHF
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+ ```
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+
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+ In designing the mission circuit of the Birds system, what are the conditions for the supplied voltages and signal inputs and outputs?
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{: .label}
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eps
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