(kicad_sch (version 20211123) (generator eeschema)
  (paper "A4")
  (lib_symbols
    (symbol "Connector_Generic:Conn_01x04" (pin_names (offset 1.016) hide) (in_bom yes) (on_board yes)
      (property "Reference" "J" (id 0) (at 0 5.08 0))
      (property "Value" "Conn_01x04" (id 1) (at 0 -7.62 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "ki_keywords" "connector" (id 4) (at 0 0 0))
      (property "ki_description" "Generic connector, single row, 01x04, script generated (kicad-library-utils/schlib/autogen/connector/)" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "Connector*:*_1x??_*" (id 6) (at 0 0 0))
      (symbol "Conn_01x04_1_1"
        (rectangle (start -1.27 -4.953) (end 0 -5.207)
          (fill (type none))
        )
        (rectangle (start -1.27 -2.413) (end 0 -2.667)
          (fill (type none))
        )
        (rectangle (start -1.27 0.127) (end 0 -0.127)
          (fill (type none))
        )
        (rectangle (start -1.27 2.667) (end 0 2.413)
          (fill (type none))
        )
        (rectangle (start -1.27 3.81) (end 1.27 -6.35)
          (fill (type background))
        )
        (pin passive line (at -5.08 2.54 0) (length 3.81)
          (name "Pin_1")
          (number "1")
        )
        (pin passive line (at -5.08 0 0) (length 3.81)
          (name "Pin_2")
          (number "2")
        )
        (pin passive line (at -5.08 -2.54 0) (length 3.81)
          (name "Pin_3")
          (number "3")
        )
        (pin passive line (at -5.08 -5.08 0) (length 3.81)
          (name "Pin_4")
          (number "4")
        )
      )
    )
    (symbol "Device:C" (pin_numbers hide) (pin_names (offset 0.254)) (in_bom yes) (on_board yes)
      (property "Reference" "C" (id 0) (at 0.635 2.54 0))
      (property "Value" "C" (id 1) (at 0.635 -2.54 0))
      (property "Footprint" "" (id 2) (at 0.9652 -3.81 0))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "ki_keywords" "cap capacitor" (id 4) (at 0 0 0))
      (property "ki_description" "Unpolarized capacitor" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "C_*" (id 6) (at 0 0 0))
      (symbol "C_0_1"
        (polyline
          (pts
            (xy -2.032 -0.762)
            (xy 2.032 -0.762)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy -2.032 0.762)
            (xy 2.032 0.762)
          )
          (fill (type none))
        )
      )
      (symbol "C_1_1"
        (pin passive line (at 0 3.81 270) (length 2.794)
          (name "~")
          (number "1")
        )
        (pin passive line (at 0 -3.81 90) (length 2.794)
          (name "~")
          (number "2")
        )
      )
    )
    (symbol "Device:R" (pin_numbers hide) (pin_names (offset 0)) (in_bom yes) (on_board yes)
      (property "Reference" "R" (id 0) (at 2.032 0 90))
      (property "Value" "R" (id 1) (at 0 0 90))
      (property "Footprint" "" (id 2) (at -1.778 0 90))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "ki_keywords" "R res resistor" (id 4) (at 0 0 0))
      (property "ki_description" "Resistor" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "R_*" (id 6) (at 0 0 0))
      (symbol "R_0_1"
        (rectangle (start -1.016 -2.54) (end 1.016 2.54)
          (fill (type none))
        )
      )
      (symbol "R_1_1"
        (pin passive line (at 0 3.81 270) (length 1.27)
          (name "~")
          (number "1")
        )
        (pin passive line (at 0 -3.81 90) (length 1.27)
          (name "~")
          (number "2")
        )
      )
    )
    (symbol "max4468:max4468" (in_bom yes) (on_board yes)
      (property "Reference" "U" (id 0) (at -7.62 19.05 0))
      (property "Value" "max4468" (id 1) (at -2.54 5.08 0))
      (property "Footprint" "Package_TO_SOT_SMD:SOT-23-8" (id 2) (at 0 0 0))
      (property "Datasheet" "" (id 3) (at 0 0 0))
      (symbol "max4468_0_1"
        (rectangle (start 2.54 0) (end 2.54 0)
          (fill (type none))
        )
        (rectangle (start 3.81 7.62) (end -10.16 17.78)
          (fill (type background))
        )
      )
      (symbol "max4468_1_1"
        (pin power_in line (at -12.7 16.51 0) (length 2.54)
          (name "GND")
          (number "1")
        )
        (pin input line (at -12.7 13.97 0) (length 2.54)
          (name "IN+")
          (number "2")
        )
        (pin input line (at -12.7 11.43 0) (length 2.54)
          (name "IN-")
          (number "3")
        )
        (pin input line (at -12.7 8.89 0) (length 2.54)
          (name "MIC_BIAS")
          (number "4")
        )
        (pin no_connect line (at 6.35 8.89 180) (length 2.54)
          (name "N.C.")
          (number "5")
        )
        (pin output line (at 6.35 11.43 180) (length 2.54)
          (name "SHDN")
          (number "6")
        )
        (pin power_in line (at 6.35 13.97 180) (length 2.54)
          (name "Vcc")
          (number "7")
        )
        (pin output line (at 6.35 16.51 180) (length 2.54)
          (name "OUT")
          (number "8")
        )
      )
    )
    (symbol "power:GND" (power) (pin_names (offset 0)) (in_bom yes) (on_board yes)
      (property "Reference" "#PWR" (id 0) (at 0 -6.35 0))
      (property "Value" "GND" (id 1) (at 0 -3.81 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "" (id 3) (at 0 0 0))
      (property "ki_keywords" "power-flag" (id 4) (at 0 0 0))
      (property "ki_description" "Power symbol creates a global label with name \"GND\" , ground" (id 5) (at 0 0 0))
      (symbol "GND_0_1"
        (polyline
          (pts
            (xy 0 0)
            (xy 0 -1.27)
            (xy 1.27 -1.27)
            (xy 0 -2.54)
            (xy -1.27 -1.27)
            (xy 0 -1.27)
          )
          (fill (type none))
        )
      )
      (symbol "GND_1_1"
        (pin power_in line (at 0 0 270) (length 0) hide
          (name "GND")
          (number "1")
        )
      )
    )
  )
  (junction (at 166.37 50.8) (diameter 0) (color 0 0 0 0))
  (junction (at 166.37 49.53) (diameter 0) (color 0 0 0 0))
  (junction (at 93.98 123.19) (diameter 0) (color 0 0 0 0))
  (junction (at 172.72 100.33) (diameter 0) (color 0 0 0 0))
  (junction (at 153.67 100.33) (diameter 0) (color 0 0 0 0))
  (junction (at 166.37 59.69) (diameter 0) (color 0 0 0 0))
  (junction (at 166.37 57.15) (diameter 0) (color 0 0 0 0))
  (junction (at 58.42 92.71) (diameter 0) (color 0 0 0 0))
  (junction (at 109.22 72.39) (diameter 0) (color 0 0 0 0))
  (junction (at 166.37 64.77) (diameter 0) (color 0 0 0 0))
  (junction (at 109.22 93.98) (diameter 0) (color 0 0 0 0))
  (junction (at 148.59 72.39) (diameter 0) (color 0 0 0 0))
  (junction (at 109.22 107.95) (diameter 0) (color 0 0 0 0))
  (junction (at 208.28 85.09) (diameter 0) (color 0 0 0 0))
  (junction (at 180.34 100.33) (diameter 0) (color 0 0 0 0))
  (no_connect (at 190.5 74.93))
  (no_connect (at 59.69 69.85))
  (no_connect (at 41.91 87.63))
  (wire (pts (xy 59.69 64.77) (xy 64.77 64.77)))
  (wire (pts (xy 93.98 120.65) (xy 93.98 123.19)))
  (wire (pts (xy 64.77 135.89) (xy 229.87 135.89)))
  (wire (pts (xy 166.37 57.15) (xy 166.37 59.69)))
  (wire (pts (xy 172.72 100.33) (xy 172.72 102.87)))
  (wire (pts (xy 139.7 114.3) (xy 146.05 114.3)))
  (wire (pts (xy 58.42 123.19) (xy 93.98 123.19)))
  (wire (pts (xy 148.59 64.77) (xy 166.37 64.77)))
  (wire (pts (xy 59.69 62.23) (xy 76.2 62.23)))
  (wire (pts (xy 93.98 120.65) (xy 109.22 120.65)))
  (wire (pts (xy 180.34 100.33) (xy 180.34 102.87)))
  (wire (pts (xy 208.28 85.09) (xy 223.52 85.09)))
  (wire (pts (xy 153.67 74.93) (xy 153.67 100.33)))
  (wire (pts (xy 109.22 104.14) (xy 109.22 107.95)))
  (wire (pts (xy 166.37 48.26) (xy 166.37 49.53)))
  (wire (pts (xy 46.99 49.53) (xy 166.37 49.53)))
  (wire (pts (xy 109.22 59.69) (xy 166.37 59.69)))
  (wire (pts (xy 41.91 90.17) (xy 58.42 90.17)))
  (wire (pts (xy 166.37 49.53) (xy 166.37 50.8)))
  (wire (pts (xy 185.42 74.93) (xy 190.5 74.93)))
  (wire (pts (xy 185.42 72.39) (xy 229.87 72.39)))
  (wire (pts (xy 86.36 57.15) (xy 166.37 57.15)))
  (wire (pts (xy 69.85 129.54) (xy 223.52 129.54)))
  (wire (pts (xy 185.42 69.85) (xy 208.28 69.85)))
  (wire (pts (xy 76.2 50.8) (xy 166.37 50.8)))
  (wire (pts (xy 229.87 135.89) (xy 229.87 72.39)))
  (wire (pts (xy 208.28 85.09) (xy 208.28 69.85)))
  (wire (pts (xy 109.22 72.39) (xy 148.59 72.39)))
  (wire (pts (xy 148.59 72.39) (xy 166.37 72.39)))
  (wire (pts (xy 162.56 93.98) (xy 162.56 77.47)))
  (wire (pts (xy 58.42 90.17) (xy 58.42 92.71)))
  (wire (pts (xy 166.37 50.8) (xy 166.37 57.15)))
  (wire (pts (xy 162.56 77.47) (xy 166.37 77.47)))
  (wire (pts (xy 109.22 64.77) (xy 109.22 59.69)))
  (wire (pts (xy 109.22 93.98) (xy 162.56 93.98)))
  (wire (pts (xy 208.28 100.33) (xy 208.28 85.09)))
  (wire (pts (xy 223.52 129.54) (xy 223.52 85.09)))
  (wire (pts (xy 64.77 64.77) (xy 64.77 135.89)))
  (wire (pts (xy 41.91 85.09) (xy 46.99 85.09)))
  (wire (pts (xy 180.34 97.79) (xy 180.34 100.33)))
  (wire (pts (xy 59.69 67.31) (xy 69.85 67.31)))
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  (wire (pts (xy 86.36 104.14) (xy 86.36 107.95)))
  (wire (pts (xy 166.37 59.69) (xy 166.37 64.77)))
  (wire (pts (xy 93.98 123.19) (xy 132.08 123.19)))
  (wire (pts (xy 153.67 100.33) (xy 153.67 114.3)))
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  (wire (pts (xy 46.99 85.09) (xy 46.99 49.53)))
  (wire (pts (xy 172.72 97.79) (xy 172.72 100.33)))
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  (wire (pts (xy 109.22 72.39) (xy 109.22 83.82)))
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  (wire (pts (xy 132.08 114.3) (xy 132.08 123.19)))
  (wire (pts (xy 109.22 118.11) (xy 109.22 120.65)))
  (symbol (lib_id "max4468:max4468") (at 179.07 86.36 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "U1" (id 0) (at 175.895 63.5 0))
    (property "Value" "max4468" (id 1) (at 175.895 66.04 0))
    (property "Footprint" "Package_TO_SOT_SMD:SOT-23-8" (id 2) (at 179.07 86.36 0))
    (property "Datasheet" "" (id 3) (at 179.07 86.36 0))
    (pin "1")
    (pin "2")
    (pin "3")
    (pin "4")
    (pin "5")
    (pin "6")
    (pin "7")
    (pin "8")
  )
  (symbol (lib_id "Device:C") (at 176.53 102.87 90) (unit 1)
    (in_bom yes) (on_board yes)
    (property "Reference" "C4" (id 0) (at 179.07 105.41 90))
    (property "Value" "47pF" (id 1) (at 179.07 106.68 90))
    (property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder" (id 2) (at 180.34 101.9048 0))
    (property "Datasheet" "~" (id 3) (at 176.53 102.87 0))
    (pin "1")
    (pin "2")
  )
  (symbol (lib_id "Device:R") (at 149.86 114.3 90) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "R5" (id 0) (at 149.86 107.95 90))
    (property "Value" "20kΩ" (id 1) (at 149.86 110.49 90))
    (property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder" (id 2) (at 149.86 116.078 90))
    (property "Datasheet" "~" (id 3) (at 149.86 114.3 0))
    (pin "1")
    (pin "2")
  )
  (symbol (lib_id "Device:R") (at 109.22 87.63 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "R2" (id 0) (at 111.76 86.3599 0))
    (property "Value" "100kΩ" (id 1) (at 111.76 88.8999 0))
    (property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder" (id 2) (at 107.442 87.63 90))
    (property "Datasheet" "~" (id 3) (at 109.22 87.63 0))
    (pin "1")
    (pin "2")
  )
  (symbol (lib_id "Device:C") (at 86.36 100.33 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "C1" (id 0) (at 90.17 99.0599 0))
    (property "Value" "10μF" (id 1) (at 90.17 101.5999 0))
    (property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder" (id 2) (at 87.3252 104.14 0))
    (property "Datasheet" "~" (id 3) (at 86.36 100.33 0))
    (pin "1")
    (pin "2")
  )
  (symbol (lib_id "Device:C") (at 135.89 114.3 90) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "C2" (id 0) (at 135.89 106.68 90))
    (property "Value" "0.1μF" (id 1) (at 135.89 109.22 90))
    (property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder" (id 2) (at 139.7 113.3348 0))
    (property "Datasheet" "~" (id 3) (at 135.89 114.3 0))
    (pin "1")
    (pin "2")
  )
  (symbol (lib_id "Connector_Generic:Conn_01x04") (at 54.61 67.31 180) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
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    (property "Value" "Conn_01x04" (id 1) (at 54.61 58.42 0))
    (property "Footprint" "Connector_PinHeader_2.00mm:PinHeader_1x04_P2.00mm_Vertical" (id 2) (at 54.61 67.31 0))
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    (pin "2")
    (pin "3")
    (pin "4")
  )
  (symbol (lib_id "Device:R") (at 109.22 114.3 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "R4" (id 0) (at 111.76 113.0299 0))
    (property "Value" "2.2kΩ" (id 1) (at 111.76 115.5699 0))
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    (pin "2")
  )
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    (property "Value" "GND" (id 1) (at 166.37 43.18 0))
    (property "Footprint" "" (id 2) (at 166.37 48.26 0))
    (property "Datasheet" "" (id 3) (at 166.37 48.26 0))
    (pin "1")
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    (property "Reference" "R6" (id 0) (at 176.53 93.98 90))
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    (property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder" (id 2) (at 176.53 99.568 90))
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  )
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    (property "Value" "0.01μF" (id 1) (at 152.4 69.8499 0))
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  )
  (sheet_instances
    (path (page "1"))
  )
  (symbol_instances
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    )
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    )
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    (path
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    )
    (path
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    )
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    (path
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    )
    (path
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    )
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    )
    (path
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    )
    (path
      (reference "R5") (unit 1) (value "20kΩ") (footprint "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder")
    )
    (path
      (reference "R6") (unit 1) (value "200kΩ") (footprint "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder")
    )
    (path
      (reference "U1") (unit 1) (value "max4468") (footprint "Package_TO_SOT_SMD:SOT-23-8")
    )
  )
)
