(kicad_sch (version 20211014) (generator kiutils)
  (paper "A3")
  (title_block
    (title "One complete 56-channel output bank · 7 x 74HC595")
    (date "2026-08-27")
    (rev "B · electrically re-audited")
    (company "Kangwon National University Psychology Lab")
    (comment 1 "Reconstructed from source code, build photographs, and SN74HC595 datasheet")
    (comment 2 "No undocumented IDC pin-to-channel mapping has been invented")
  )
  (lib_symbols
    (symbol "Device:R_Small" (pin_numbers hide) (pin_names (offset 0.254) hide) (in_bom yes) (on_board yes)
      (property "Reference" "R" (at 0.762 0.508 0))
      (property "Value" "R_Small" (at 0.762 -1.016 0))
      (property "Footprint" "" (at 0 0 0))
      (property "Datasheet" "~" (at 0 0 0))
      (property "ki_keywords" "R resistor" (at 0 0 0))
      (property "ki_description" "Resistor, small symbol" (at 0 0 0))
      (property "ki_fp_filters" "R_*" (at 0 0 0))
      (symbol "R_Small_0_1"
        (rectangle (start -0.762 1.778) (end 0.762 -1.778)
          (fill (type none))
        )
      )
      (symbol "R_Small_1_1"
        (pin passive line (at 0 2.54 270) (length 0.762)
          (name "~")
          (number "1")
        )
        (pin passive line (at 0 -2.54 90) (length 0.762)
          (name "~")
          (number "2")
        )
      )
    )
    (symbol "74xx:74HC595" (in_bom yes) (on_board yes)
      (property "Reference" "U" (at -7.62 13.97 0))
      (property "Value" "74HC595" (at -7.62 -16.51 0))
      (property "Footprint" "" (at 0 0 0))
      (property "Datasheet" "http://www.ti.com/lit/ds/symlink/sn74hc595.pdf" (at 0 0 0))
      (property "ki_keywords" "HCMOS SR 3State" (at 0 0 0))
      (property "ki_description" "8-bit serial in/out Shift Register 3-State Outputs" (at 0 0 0))
      (property "ki_fp_filters" "DIP*W7.62mm* SOIC*3.9x9.9mm*P1.27mm* TSSOP*4.4x5mm*P0.65mm* SOIC*5.3x10.2mm*P1.27mm* SOIC*7.5x10.3mm*P1.27mm*" (at 0 0 0))
      (symbol "74HC595_1_0"
        (pin tri_state line (at 10.16 7.62 180) (length 2.54)
          (name "QB")
          (number "1")
        )
        (pin input line (at -10.16 2.54 0) (length 2.54)
          (name "~{SRCLR}")
          (number "10")
        )
        (pin input line (at -10.16 5.08 0) (length 2.54)
          (name "SRCLK")
          (number "11")
        )
        (pin input line (at -10.16 -2.54 0) (length 2.54)
          (name "RCLK")
          (number "12")
        )
        (pin input line (at -10.16 -5.08 0) (length 2.54)
          (name "~{OE}")
          (number "13")
        )
        (pin input line (at -10.16 10.16 0) (length 2.54)
          (name "SER")
          (number "14")
        )
        (pin tri_state line (at 10.16 10.16 180) (length 2.54)
          (name "QA")
          (number "15")
        )
        (pin power_in line (at 0 15.24 270) (length 2.54)
          (name "VCC")
          (number "16")
        )
        (pin tri_state line (at 10.16 5.08 180) (length 2.54)
          (name "QC")
          (number "2")
        )
        (pin tri_state line (at 10.16 2.54 180) (length 2.54)
          (name "QD")
          (number "3")
        )
        (pin tri_state line (at 10.16 0 180) (length 2.54)
          (name "QE")
          (number "4")
        )
        (pin tri_state line (at 10.16 -2.54 180) (length 2.54)
          (name "QF")
          (number "5")
        )
        (pin tri_state line (at 10.16 -5.08 180) (length 2.54)
          (name "QG")
          (number "6")
        )
        (pin tri_state line (at 10.16 -7.62 180) (length 2.54)
          (name "QH")
          (number "7")
        )
        (pin power_in line (at 0 -17.78 90) (length 2.54)
          (name "GND")
          (number "8")
        )
        (pin output line (at 10.16 -12.7 180) (length 2.54)
          (name "QH'")
          (number "9")
        )
      )
      (symbol "74HC595_1_1"
        (rectangle (start -7.62 12.7) (end 7.62 -15.24)
          (fill (type background))
        )
      )
    )
  )
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  (text "SHEET E-02 · ONE COMPLETE 56-CHANNEL SIDE BOARD" (at 18 17 0))
  (text "U1…U7 form one serial chain. SRCLK, RCLK, +5 V and GND are shared; output nets remain independent."
    (at 18 26 0)
  )
  (text "This sheet is repeated once for the opposite side: local CH0…55 become system CH56…111."
    (at 18 32 0)
  )
  (text "Electrical topology is authoritative. See Fritzing sheet P-01 for photographed component placement."
    (at 18 266 0)
  )
  (text "STAGE 1 · CH0…7" (at 24.0 101.0 0))
  (text "STAGE 2 · CH8…15" (at 78.0 101.0 0))
  (text "STAGE 3 · CH16…23" (at 132.0 101.0 0))
  (text "STAGE 4 · CH24…31" (at 186.0 101.0 0))
  (text "STAGE 5 · CH32…39" (at 240.0 101.0 0))
  (text "STAGE 6 · CH40…47" (at 294.0 101.0 0))
  (text "STAGE 7 · CH48…55" (at 348.0 101.0 0))
  (label "SER_IN" (at 21.0 59.84 180))
  (label "SRCLK_BCM17" (at 21.0 64.92 180))
  (label "+5V_SRCLR" (at 21.0 67.46 180))
  (label "RCLK_BCM27" (at 21.0 72.54 180))
  (label "GND_OE" (at 21.0 75.08 180))
  (label "+5V" (at 40.0 48.0 90))
  (label "GND" (at 40.0 94.0 90))
  (label "C1_2" (at 60.0 82.7 0))
  (label "S1_QA" (at 59.0 59.84 0))
  (label "S1_QA" (at 29.0 112.0 180))
  (label "CH0" (at 51.0 112.0 0))
  (label "S1_QB" (at 59.0 62.38 0))
  (label "S1_QB" (at 29.0 130.0 180))
  (label "CH1" (at 51.0 130.0 0))
  (label "S1_QC" (at 59.0 64.92 0))
  (label "S1_QC" (at 29.0 148.0 180))
  (label "CH2" (at 51.0 148.0 0))
  (label "S1_QD" (at 59.0 67.46 0))
  (label "S1_QD" (at 29.0 166.0 180))
  (label "CH3" (at 51.0 166.0 0))
  (label "S1_QE" (at 59.0 70.0 0))
  (label "S1_QE" (at 29.0 184.0 180))
  (label "CH4" (at 51.0 184.0 0))
  (label "S1_QF" (at 59.0 72.54 0))
  (label "S1_QF" (at 29.0 202.0 180))
  (label "CH5" (at 51.0 202.0 0))
  (label "S1_QG" (at 59.0 75.08 0))
  (label "S1_QG" (at 29.0 220.0 180))
  (label "CH6" (at 51.0 220.0 0))
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