(kicad_sch (version 20211123) (generator eeschema)

  (uuid e63e39d7-6ac0-4ffd-8aa3-1841a4541b55)

  (paper "A4")

  (lib_symbols
    (symbol "Amplifier_Operational:LM358" (pin_names (offset 0.127)) (in_bom yes) (on_board yes)
      (property "Reference" "U" (id 0) (at 0 5.08 0)
        (effects (font (size 1.27 1.27)) (justify left))
      )
      (property "Value" "LM358" (id 1) (at 0 -5.08 0)
        (effects (font (size 1.27 1.27)) (justify left))
      )
      (property "Footprint" "" (id 2) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Datasheet" "http://www.ti.com/lit/ds/symlink/lm2904-n.pdf" (id 3) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_locked" "" (id 4) (at 0 0 0)
        (effects (font (size 1.27 1.27)))
      )
      (property "ki_keywords" "dual opamp" (id 5) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_description" "Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8" (id 6) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_fp_filters" "SOIC*3.9x4.9mm*P1.27mm* DIP*W7.62mm* TO*99* OnSemi*Micro8* TSSOP*3x3mm*P0.65mm* TSSOP*4.4x3mm*P0.65mm* MSOP*3x3mm*P0.65mm* SSOP*3.9x4.9mm*P0.635mm* LFCSP*2x2mm*P0.5mm* *SIP* SOIC*5.3x6.2mm*P1.27mm*" (id 7) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (symbol "LM358_1_1"
        (polyline
          (pts
            (xy -5.08 5.08)
            (xy 5.08 0)
            (xy -5.08 -5.08)
            (xy -5.08 5.08)
          )
          (stroke (width 0.254) (type default) (color 0 0 0 0))
          (fill (type background))
        )
        (pin output line (at 7.62 0 180) (length 2.54)
          (name "~" (effects (font (size 1.27 1.27))))
          (number "1" (effects (font (size 1.27 1.27))))
        )
        (pin input line (at -7.62 -2.54 0) (length 2.54)
          (name "-" (effects (font (size 1.27 1.27))))
          (number "2" (effects (font (size 1.27 1.27))))
        )
        (pin input line (at -7.62 2.54 0) (length 2.54)
          (name "+" (effects (font (size 1.27 1.27))))
          (number "3" (effects (font (size 1.27 1.27))))
        )
      )
      (symbol "LM358_2_1"
        (polyline
          (pts
            (xy -5.08 5.08)
            (xy 5.08 0)
            (xy -5.08 -5.08)
            (xy -5.08 5.08)
          )
          (stroke (width 0.254) (type default) (color 0 0 0 0))
          (fill (type background))
        )
        (pin input line (at -7.62 2.54 0) (length 2.54)
          (name "+" (effects (font (size 1.27 1.27))))
          (number "5" (effects (font (size 1.27 1.27))))
        )
        (pin input line (at -7.62 -2.54 0) (length 2.54)
          (name "-" (effects (font (size 1.27 1.27))))
          (number "6" (effects (font (size 1.27 1.27))))
        )
        (pin output line (at 7.62 0 180) (length 2.54)
          (name "~" (effects (font (size 1.27 1.27))))
          (number "7" (effects (font (size 1.27 1.27))))
        )
      )
      (symbol "LM358_3_1"
        (pin power_in line (at -2.54 -7.62 90) (length 3.81)
          (name "V-" (effects (font (size 1.27 1.27))))
          (number "4" (effects (font (size 1.27 1.27))))
        )
        (pin power_in line (at -2.54 7.62 270) (length 3.81)
          (name "V+" (effects (font (size 1.27 1.27))))
          (number "8" (effects (font (size 1.27 1.27))))
        )
      )
    )
    (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)
        (effects (font (size 1.27 1.27)) (justify left))
      )
      (property "Value" "C" (id 1) (at 0.635 -2.54 0)
        (effects (font (size 1.27 1.27)) (justify left))
      )
      (property "Footprint" "" (id 2) (at 0.9652 -3.81 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Datasheet" "~" (id 3) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_keywords" "cap capacitor" (id 4) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_description" "Unpolarized capacitor" (id 5) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_fp_filters" "C_*" (id 6) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (symbol "C_0_1"
        (polyline
          (pts
            (xy -2.032 -0.762)
            (xy 2.032 -0.762)
          )
          (stroke (width 0.508) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy -2.032 0.762)
            (xy 2.032 0.762)
          )
          (stroke (width 0.508) (type default) (color 0 0 0 0))
          (fill (type none))
        )
      )
      (symbol "C_1_1"
        (pin passive line (at 0 3.81 270) (length 2.794)
          (name "~" (effects (font (size 1.27 1.27))))
          (number "1" (effects (font (size 1.27 1.27))))
        )
        (pin passive line (at 0 -3.81 90) (length 2.794)
          (name "~" (effects (font (size 1.27 1.27))))
          (number "2" (effects (font (size 1.27 1.27))))
        )
      )
    )
    (symbol "Device:D_Photo" (pin_numbers hide) (pin_names hide) (in_bom yes) (on_board yes)
      (property "Reference" "D" (id 0) (at 0.508 1.778 0)
        (effects (font (size 1.27 1.27)) (justify left))
      )
      (property "Value" "D_Photo" (id 1) (at -1.016 -2.794 0)
        (effects (font (size 1.27 1.27)))
      )
      (property "Footprint" "" (id 2) (at -1.27 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Datasheet" "~" (id 3) (at -1.27 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_keywords" "photodiode diode opto" (id 4) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_description" "Photodiode" (id 5) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (symbol "D_Photo_0_1"
        (polyline
          (pts
            (xy -2.54 1.27)
            (xy -2.54 -1.27)
          )
          (stroke (width 0.254) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy -2.032 1.778)
            (xy -1.524 1.778)
          )
          (stroke (width 0) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 0)
            (xy -2.54 0)
          )
          (stroke (width 0) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy -0.508 3.302)
            (xy -2.032 1.778)
            (xy -2.032 2.286)
          )
          (stroke (width 0) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 -1.27)
            (xy 0 1.27)
            (xy -2.54 0)
            (xy 0 -1.27)
          )
          (stroke (width 0.254) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0.762 3.302)
            (xy -0.762 1.778)
            (xy -0.762 2.286)
            (xy -0.762 1.778)
            (xy -0.254 1.778)
          )
          (stroke (width 0) (type default) (color 0 0 0 0))
          (fill (type none))
        )
      )
      (symbol "D_Photo_1_1"
        (pin passive line (at -5.08 0 0) (length 2.54)
          (name "K" (effects (font (size 1.27 1.27))))
          (number "1" (effects (font (size 1.27 1.27))))
        )
        (pin passive line (at 2.54 0 180) (length 2.54)
          (name "A" (effects (font (size 1.27 1.27))))
          (number "2" (effects (font (size 1.27 1.27))))
        )
      )
    )
    (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)
        (effects (font (size 1.27 1.27)))
      )
      (property "Value" "R" (id 1) (at 0 0 90)
        (effects (font (size 1.27 1.27)))
      )
      (property "Footprint" "" (id 2) (at -1.778 0 90)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Datasheet" "~" (id 3) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_keywords" "R res resistor" (id 4) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_description" "Resistor" (id 5) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_fp_filters" "R_*" (id 6) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (symbol "R_0_1"
        (rectangle (start -1.016 -2.54) (end 1.016 2.54)
          (stroke (width 0.254) (type default) (color 0 0 0 0))
          (fill (type none))
        )
      )
      (symbol "R_1_1"
        (pin passive line (at 0 3.81 270) (length 1.27)
          (name "~" (effects (font (size 1.27 1.27))))
          (number "1" (effects (font (size 1.27 1.27))))
        )
        (pin passive line (at 0 -3.81 90) (length 1.27)
          (name "~" (effects (font (size 1.27 1.27))))
          (number "2" (effects (font (size 1.27 1.27))))
        )
      )
    )
    (symbol "power:GNDPWR" (power) (pin_names (offset 0)) (in_bom yes) (on_board yes)
      (property "Reference" "#PWR" (id 0) (at 0 -5.08 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Value" "GNDPWR" (id 1) (at 0 -3.302 0)
        (effects (font (size 1.27 1.27)))
      )
      (property "Footprint" "" (id 2) (at 0 -1.27 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Datasheet" "" (id 3) (at 0 -1.27 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_keywords" "power-flag" (id 4) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_description" "Power symbol creates a global label with name \"GNDPWR\" , power ground" (id 5) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (symbol "GNDPWR_0_1"
        (polyline
          (pts
            (xy 0 -1.27)
            (xy 0 0)
          )
          (stroke (width 0) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy -1.016 -1.27)
            (xy -1.27 -2.032)
            (xy -1.27 -2.032)
          )
          (stroke (width 0.2032) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy -0.508 -1.27)
            (xy -0.762 -2.032)
            (xy -0.762 -2.032)
          )
          (stroke (width 0.2032) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 -1.27)
            (xy -0.254 -2.032)
            (xy -0.254 -2.032)
          )
          (stroke (width 0.2032) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0.508 -1.27)
            (xy 0.254 -2.032)
            (xy 0.254 -2.032)
          )
          (stroke (width 0.2032) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy 1.016 -1.27)
            (xy -1.016 -1.27)
            (xy -1.016 -1.27)
          )
          (stroke (width 0.2032) (type default) (color 0 0 0 0))
          (fill (type none))
        )
        (polyline
          (pts
            (xy 1.016 -1.27)
            (xy 0.762 -2.032)
            (xy 0.762 -2.032)
            (xy 0.762 -2.032)
          )
          (stroke (width 0.2032) (type default) (color 0 0 0 0))
          (fill (type none))
        )
      )
      (symbol "GNDPWR_1_1"
        (pin power_in line (at 0 0 270) (length 0) hide
          (name "GNDPWR" (effects (font (size 1.27 1.27))))
          (number "1" (effects (font (size 1.27 1.27))))
        )
      )
    )
    (symbol "power:PWR_FLAG" (power) (pin_numbers hide) (pin_names (offset 0) hide) (in_bom yes) (on_board yes)
      (property "Reference" "#FLG" (id 0) (at 0 1.905 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Value" "PWR_FLAG" (id 1) (at 0 3.81 0)
        (effects (font (size 1.27 1.27)))
      )
      (property "Footprint" "" (id 2) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Datasheet" "~" (id 3) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_keywords" "power-flag" (id 4) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "ki_description" "Special symbol for telling ERC where power comes from" (id 5) (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (symbol "PWR_FLAG_0_0"
        (pin power_out line (at 0 0 90) (length 0)
          (name "pwr" (effects (font (size 1.27 1.27))))
          (number "1" (effects (font (size 1.27 1.27))))
        )
      )
      (symbol "PWR_FLAG_0_1"
        (polyline
          (pts
            (xy 0 0)
            (xy 0 1.27)
            (xy -1.016 1.905)
            (xy 0 2.54)
            (xy 1.016 1.905)
            (xy 0 1.27)
          )
          (stroke (width 0) (type default) (color 0 0 0 0))
          (fill (type none))
        )
      )
    )
  )


  (wire (pts (xy 31.75 179.07) (xy 31.75 110.49))
    (stroke (width 0) (type default) (color 0 0 0 0))
    (uuid 48abcbca-0b7c-4b07-9783-2f0b28557d84)
  )
  (wire (pts (xy 31.75 110.49) (xy 34.29 110.49))
    (stroke (width 0) (type default) (color 0 0 0 0))
    (uuid 4ca56353-72f9-4b9e-959c-a99af4493b8c)
  )
  (wire (pts (xy 34.29 30.48) (xy 34.29 45.72))
    (stroke (width 0) (type default) (color 0 0 0 0))
    (uuid 4e103eae-9db3-4a71-b8c1-4f358a92f20a)
  )
  (wire (pts (xy 270.51 30.48) (xy 34.29 30.48))
    (stroke (width 0) (type default) (color 0 0 0 0))
    (uuid 653637e9-0d51-4ead-8fd7-014d3034ab82)
  )
  (wire (pts (xy 34.29 53.34) (xy 34.29 102.87))
    (stroke (width 0) (type default) (color 0 0 0 0))
    (uuid aa0f1f2f-2849-4fba-9e0f-e9efaead02a4)
  )

  (symbol (lib_id "Device:R") (at 234.95 100.33 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid 4e741225-715b-4a98-b214-a966a085dc44)
    (property "Reference" "R6" (id 0) (at 237.49 99.0599 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "68k Ω" (id 1) (at 237.49 101.5999 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" (id 2) (at 233.172 100.33 90)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 234.95 100.33 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 09682f05-b4e6-4e50-98a0-ce1e14e1d9ed))
    (pin "2" (uuid 494d55a2-ad9a-4bf0-bbf7-1a7cb99de5df))
  )

  (symbol (lib_id "Device:C") (at 267.97 109.22 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid 57720542-bdde-4812-ae04-f6c39f4da1e5)
    (property "Reference" "C2" (id 0) (at 271.78 107.9499 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "2.2 μF" (id 1) (at 271.78 110.4899 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Capacitor_THT:CP_Radial_D5.0mm_P2.50mm" (id 2) (at 268.9352 113.03 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 267.97 109.22 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 31ba89c8-dd03-4cdd-9ba7-3f7d0aded6a1))
    (pin "2" (uuid 800336e4-24a6-46ec-9023-c027ab2f3d06))
  )

  (symbol (lib_id "Device:D_Photo") (at 34.29 50.8 270) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid 6ac64fb0-ce26-4829-9754-fa3e990c5a4f)
    (property "Reference" "D1" (id 0) (at 39.37 48.5774 90)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "D_Photo" (id 1) (at 39.37 51.1174 90)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Diode_THT:D_DO-247_Vertical" (id 2) (at 34.29 49.53 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 34.29 49.53 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 9c7765b1-1026-4264-833e-5fa1c39587b3))
    (pin "2" (uuid 0f77f43f-3a88-4d2e-98b4-1d0b86a7bc90))
  )

  (symbol (lib_id "Device:R") (at 210.82 123.19 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid 845fdfbc-c464-442f-8ca4-945189100ea0)
    (property "Reference" "R4" (id 0) (at 213.36 121.9199 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "300 Ω" (id 1) (at 213.36 124.4599 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" (id 2) (at 209.042 123.19 90)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 210.82 123.19 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 8544b55a-6739-490d-835e-4b5b67f1784f))
    (pin "2" (uuid 171e50c5-6cc5-462d-8bf3-001b786e927f))
  )

  (symbol (lib_id "Device:R") (at 34.29 106.68 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid 8bbbff70-a0e6-4522-9285-33faec68b868)
    (property "Reference" "R5" (id 0) (at 36.83 105.4099 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "100kΩ" (id 1) (at 36.83 107.9499 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" (id 2) (at 32.512 106.68 90)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 34.29 106.68 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 03447a1a-ebbd-40c4-ad89-890e95b606bb))
    (pin "2" (uuid cb62cdf5-427f-4e72-bcad-46fb7b0d7943))
  )

  (symbol (lib_id "Amplifier_Operational:LM358") (at 99.06 93.98 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid a7808f15-c340-4b04-b8c9-3138e01c9331)
    (property "Reference" "U1" (id 0) (at 99.06 83.82 0))
    (property "Value" "LM358" (id 1) (at 99.06 86.36 0))
    (property "Footprint" "Package_DIP:SMDIP-8_W9.53mm" (id 2) (at 99.06 93.98 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "http://www.ti.com/lit/ds/symlink/lm2904-n.pdf" (id 3) (at 99.06 93.98 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 50396b0a-0f83-46ce-89ad-1e28f094a26a))
    (pin "2" (uuid 6ab7c0f8-8731-46f9-91ad-a25cb31ce6e1))
    (pin "3" (uuid 2ffd2dd8-cab7-404b-9d90-2b309df138a8))
  )

  (symbol (lib_id "Amplifier_Operational:LM358") (at 142.24 142.24 0) (unit 3)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid b4008af9-04d0-41c9-9c35-f8b44c33ac9a)
    (property "Reference" "U1" (id 0) (at 140.97 140.9699 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "LM358" (id 1) (at 140.97 143.5099 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Package_DIP:SMDIP-8_W9.53mm" (id 2) (at 142.24 142.24 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "http://www.ti.com/lit/ds/symlink/lm2904-n.pdf" (id 3) (at 142.24 142.24 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "4" (uuid 7cb260b0-5651-4e66-90db-eaf84bb25ba9))
    (pin "8" (uuid 3943437c-7fcb-4be3-88eb-7e08b4c71093))
  )

  (symbol (lib_id "Device:R") (at 201.93 104.14 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid bc9c8c91-6429-45dc-8aad-4a6cefec80bb)
    (property "Reference" "R1" (id 0) (at 204.47 102.8699 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "300 Ω" (id 1) (at 204.47 105.4099 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" (id 2) (at 200.152 104.14 90)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 201.93 104.14 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 504f239a-c3a3-4d8f-84bc-38a93462abca))
    (pin "2" (uuid 9d69e525-b166-447d-a267-948676c9a842))
  )

  (symbol (lib_id "power:PWR_FLAG") (at 270.51 30.48 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid be0a22b0-538f-47bb-8d75-a8ed627b0f03)
    (property "Reference" "#FLG01" (id 0) (at 270.51 28.575 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Value" "PWR_FLAG" (id 1) (at 270.51 25.4 0))
    (property "Footprint" "" (id 2) (at 270.51 30.48 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 270.51 30.48 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 922ccce2-ad30-4291-836d-8d8043c8dd60))
  )

  (symbol (lib_id "Device:R") (at 201.93 156.21 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid c24b6edb-1820-4e19-99c3-c6c132fdac7c)
    (property "Reference" "R2" (id 0) (at 204.47 154.9399 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "100kΩ" (id 1) (at 204.47 157.4799 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" (id 2) (at 200.152 156.21 90)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 201.93 156.21 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 8287776d-f1da-4297-a903-eb38e7538c32))
    (pin "2" (uuid f99e28e0-b778-4f3a-82df-4edad738dbca))
  )

  (symbol (lib_id "Amplifier_Operational:LM358") (at 120.65 121.92 0) (unit 2)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid c79aaeca-3f0b-4049-82fc-90802792f67b)
    (property "Reference" "U1" (id 0) (at 120.65 111.76 0))
    (property "Value" "LM358" (id 1) (at 120.65 114.3 0))
    (property "Footprint" "Package_DIP:SMDIP-8_W9.53mm" (id 2) (at 120.65 121.92 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "http://www.ti.com/lit/ds/symlink/lm2904-n.pdf" (id 3) (at 120.65 121.92 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "5" (uuid 0f421719-f160-492d-bab5-d03441391dd8))
    (pin "6" (uuid 569993c3-1d89-473b-a3b4-7449f9c94c5c))
    (pin "7" (uuid 97c2c7d8-b745-4987-b0ed-2089ced4b8be))
  )

  (symbol (lib_id "Device:C") (at 250.19 132.08 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid dd5cdbd6-24c5-4d5f-b80c-0acd8b118746)
    (property "Reference" "C1" (id 0) (at 254 130.8099 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "1 μF" (id 1) (at 254 133.3499 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Capacitor_THT:CP_Radial_D5.0mm_P2.50mm" (id 2) (at 251.1552 135.89 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 250.19 132.08 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 3a4a57e1-b585-4938-941e-dbf75ba575c5))
    (pin "2" (uuid fb12a6eb-e197-436e-985f-2b5a0d2b2711))
  )

  (symbol (lib_id "Device:R") (at 204.47 88.9 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid f3123564-7b39-4153-9b11-896906af3e6a)
    (property "Reference" "R3" (id 0) (at 207.01 87.6299 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Value" "300 Ω" (id 1) (at 207.01 90.1699 0)
      (effects (font (size 1.27 1.27)) (justify left))
    )
    (property "Footprint" "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" (id 2) (at 202.692 88.9 90)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~" (id 3) (at 204.47 88.9 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 58da3fa2-2f0e-4b97-925b-5195127f3722))
    (pin "2" (uuid 3a40e60d-ba42-4e32-bd59-a9d167735b1a))
  )

  (symbol (lib_id "power:GNDPWR") (at 31.75 179.07 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (uuid fc8e4073-d1c9-4294-b9b9-725298f47036)
    (property "Reference" "#PWR01" (id 0) (at 31.75 184.15 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Value" "GNDPWR" (id 1) (at 31.623 184.15 0))
    (property "Footprint" "" (id 2) (at 31.75 180.34 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "" (id 3) (at 31.75 180.34 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1" (uuid 03b222f2-b421-4321-bd3f-6d6f6cf41dce))
  )

  (sheet_instances
    (path "/" (page "1"))
  )

  (symbol_instances
    (path "/be0a22b0-538f-47bb-8d75-a8ed627b0f03"
      (reference "#FLG01") (unit 1) (value "PWR_FLAG") (footprint "")
    )
    (path "/fc8e4073-d1c9-4294-b9b9-725298f47036"
      (reference "#PWR01") (unit 1) (value "GNDPWR") (footprint "")
    )
    (path "/dd5cdbd6-24c5-4d5f-b80c-0acd8b118746"
      (reference "C1") (unit 1) (value "1 μF") (footprint "Capacitor_THT:CP_Radial_D5.0mm_P2.50mm")
    )
    (path "/57720542-bdde-4812-ae04-f6c39f4da1e5"
      (reference "C2") (unit 1) (value "2.2 μF") (footprint "Capacitor_THT:CP_Radial_D5.0mm_P2.50mm")
    )
    (path "/6ac64fb0-ce26-4829-9754-fa3e990c5a4f"
      (reference "D1") (unit 1) (value "D_Photo") (footprint "Diode_THT:D_DO-247_Vertical")
    )
    (path "/bc9c8c91-6429-45dc-8aad-4a6cefec80bb"
      (reference "R1") (unit 1) (value "300 Ω") (footprint "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal")
    )
    (path "/c24b6edb-1820-4e19-99c3-c6c132fdac7c"
      (reference "R2") (unit 1) (value "100kΩ") (footprint "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal")
    )
    (path "/f3123564-7b39-4153-9b11-896906af3e6a"
      (reference "R3") (unit 1) (value "300 Ω") (footprint "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal")
    )
    (path "/845fdfbc-c464-442f-8ca4-945189100ea0"
      (reference "R4") (unit 1) (value "300 Ω") (footprint "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal")
    )
    (path "/8bbbff70-a0e6-4522-9285-33faec68b868"
      (reference "R5") (unit 1) (value "100kΩ") (footprint "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal")
    )
    (path "/4e741225-715b-4a98-b214-a966a085dc44"
      (reference "R6") (unit 1) (value "68k Ω") (footprint "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal")
    )
    (path "/a7808f15-c340-4b04-b8c9-3138e01c9331"
      (reference "U1") (unit 1) (value "LM358") (footprint "Package_DIP:SMDIP-8_W9.53mm")
    )
    (path "/c79aaeca-3f0b-4049-82fc-90802792f67b"
      (reference "U1") (unit 2) (value "LM358") (footprint "Package_DIP:SMDIP-8_W9.53mm")
    )
    (path "/b4008af9-04d0-41c9-9c35-f8b44c33ac9a"
      (reference "U1") (unit 3) (value "LM358") (footprint "Package_DIP:SMDIP-8_W9.53mm")
    )
  )
)