(kicad_sch (version 20211123) (generator eeschema)
  (paper "A4")
  (lib_symbols
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      (property "Reference" "U" (id 0) (at 0 5.08 0))
      (property "Value" "LM324A" (id 1) (at 0 -5.08 0))
      (property "Footprint" "" (id 2) (at -1.27 2.54 0))
      (property "Datasheet" "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" (id 3) (at 1.27 5.08 0))
      (property "ki_locked" "" (id 4) (at 0 0 0))
      (property "ki_keywords" "quad opamp" (id 5) (at 0 0 0))
      (property "ki_description" "Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14" (id 6) (at 0 0 0))
      (property "ki_fp_filters" "SOIC*3.9x8.7mm*P1.27mm* DIP*W7.62mm* TSSOP*4.4x5mm*P0.65mm* SSOP*5.3x6.2mm*P0.65mm* MSOP*3x3mm*P0.5mm*" (id 7) (at 0 0 0))
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            (xy 5.08 0)
            (xy -5.08 -5.08)
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          (fill (type background))
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          (name "~")
          (number "1")
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        (pin input line (at -7.62 -2.54 0) (length 2.54)
          (name "-")
          (number "2")
        )
        (pin input line (at -7.62 2.54 0) (length 2.54)
          (name "+")
          (number "3")
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          (pts
            (xy -5.08 5.08)
            (xy 5.08 0)
            (xy -5.08 -5.08)
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          (fill (type background))
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          (name "+")
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          (name "-")
          (number "6")
        )
        (pin output line (at 7.62 0 180) (length 2.54)
          (name "~")
          (number "7")
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      (symbol "LM324A_3_1"
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            (xy 5.08 0)
            (xy -5.08 -5.08)
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          (fill (type background))
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        (pin input line (at -7.62 2.54 0) (length 2.54)
          (name "+")
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        (pin output line (at 7.62 0 180) (length 2.54)
          (name "~")
          (number "8")
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        (pin input line (at -7.62 -2.54 0) (length 2.54)
          (name "-")
          (number "9")
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      (symbol "LM324A_4_1"
        (polyline
          (pts
            (xy -5.08 5.08)
            (xy 5.08 0)
            (xy -5.08 -5.08)
            (xy -5.08 5.08)
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          (name "+")
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        )
        (pin input line (at -7.62 -2.54 0) (length 2.54)
          (name "-")
          (number "13")
        )
        (pin output line (at 7.62 0 180) (length 2.54)
          (name "~")
          (number "14")
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      )
      (symbol "LM324A_5_1"
        (pin power_in line (at -2.54 -7.62 90) (length 3.81)
          (name "V-")
          (number "11")
        )
        (pin power_in line (at -2.54 7.62 270) (length 3.81)
          (name "V+")
          (number "4")
        )
      )
    )
    (symbol "Amplifier_Operational:OPA188xxD" (pin_names (offset 0.127)) (in_bom yes) (on_board yes)
      (property "Reference" "U" (id 0) (at 0 6.35 0))
      (property "Value" "OPA188xxD" (id 1) (at 0 3.81 0))
      (property "Footprint" "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" (id 2) (at -2.54 -5.08 0))
      (property "Datasheet" "http://www.ti.com/lit/ds/symlink/opa188.pdf" (id 3) (at 3.81 3.81 0))
      (property "ki_keywords" "single opamp zero-drift" (id 4) (at 0 0 0))
      (property "ki_description" "Precision, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift Operational Amplifier, SOIC-8" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "SOIC*3.9x4.9mm*P1.27mm*" (id 6) (at 0 0 0))
      (symbol "OPA188xxD_0_1"
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      (symbol "OPA188xxD_1_1"
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          (number "1")
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          (name "-")
          (number "2")
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        (pin input line (at -7.62 2.54 0) (length 2.54)
          (name "+")
          (number "3")
        )
        (pin power_in line (at -2.54 -7.62 90) (length 3.81)
          (name "V-")
          (number "4")
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        (pin no_connect line (at 0 2.54 270) (length 2.54) hide
          (name "NC")
          (number "5")
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        (pin output line (at 7.62 0 180) (length 2.54)
          (name "~")
          (number "6")
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        (pin power_in line (at -2.54 7.62 270) (length 3.81)
          (name "V+")
          (number "7")
        )
        (pin no_connect line (at 0 -2.54 90) (length 2.54) hide
          (name "NC")
          (number "8")
        )
      )
    )
    (symbol "Amplifier_Operational:TL072" (pin_names (offset 0.127)) (in_bom yes) (on_board yes)
      (property "Reference" "U" (id 0) (at 0 5.08 0))
      (property "Value" "TL072" (id 1) (at 0 -5.08 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "http://www.ti.com/lit/ds/symlink/tl071.pdf" (id 3) (at 0 0 0))
      (property "ki_locked" "" (id 4) (at 0 0 0))
      (property "ki_keywords" "dual opamp" (id 5) (at 0 0 0))
      (property "ki_description" "Dual Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8" (id 6) (at 0 0 0))
      (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))
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        (pin input line (at -7.62 2.54 0) (length 2.54)
          (name "+")
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          (name "+")
          (number "5")
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          (name "-")
          (number "6")
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        (pin output line (at 7.62 0 180) (length 2.54)
          (name "~")
          (number "7")
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      (symbol "TL072_3_1"
        (pin power_in line (at -2.54 -7.62 90) (length 3.81)
          (name "V-")
          (number "4")
        )
        (pin power_in line (at -2.54 7.62 270) (length 3.81)
          (name "V+")
          (number "8")
        )
      )
    )
    (symbol "Analog_DAC:LTC1664IGN" (pin_names (offset 1.016)) (in_bom yes) (on_board yes)
      (property "Reference" "U" (id 0) (at -8.89 12.7 0))
      (property "Value" "LTC1664IGN" (id 1) (at 2.54 12.7 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "https://www.analog.com/media/en/technical-documentation/data-sheets/1664fa.pdf" (id 3) (at 0 0 0))
      (property "ki_keywords" "Quad DAC Micropower 10bit 4ch" (id 4) (at 0 0 0))
      (property "ki_description" "Quad Micropower 10-bit DAC, Industrial, SSOP-16" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "*SSOP*" (id 6) (at 0 0 0))
      (symbol "LTC1664IGN_0_1"
        (rectangle (start -8.89 11.43) (end 8.89 -11.43)
          (fill (type background))
        )
      )
      (symbol "LTC1664IGN_1_1"
        (pin power_in line (at 0 -15.24 90) (length 3.81)
          (name "GND")
          (number "1")
        )
        (pin output line (at -12.7 5.08 0) (length 3.81)
          (name "DOUT")
          (number "10")
        )
        (pin input line (at -12.7 -7.62 0) (length 3.81)
          (name "~{CLR}")
          (number "11")
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        (pin no_connect line (at -5.08 -15.24 90) (length 3.81) hide
          (name "NC")
          (number "12")
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        (pin no_connect line (at -2.54 -15.24 90) (length 3.81) hide
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          (number "13")
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        (pin no_connect line (at 2.54 -15.24 90) (length 3.81) hide
          (name "NC")
          (number "14")
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        (pin no_connect line (at 5.08 -15.24 90) (length 3.81) hide
          (name "NC")
          (number "15")
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        (pin power_in line (at 0 15.24 270) (length 3.81)
          (name "VCC")
          (number "16")
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        (pin output line (at 12.7 7.62 180) (length 3.81)
          (name "OUTA")
          (number "2")
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        (pin output line (at 12.7 5.08 180) (length 3.81)
          (name "OUTB")
          (number "3")
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        (pin output line (at 12.7 2.54 180) (length 3.81)
          (name "OUTC")
          (number "4")
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        (pin output line (at 12.7 0 180) (length 3.81)
          (name "OUTD")
          (number "5")
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        (pin input line (at 12.7 -7.62 180) (length 3.81)
          (name "REF")
          (number "6")
        )
        (pin input line (at -12.7 0 0) (length 3.81)
          (name "~{CS}/LD")
          (number "7")
        )
        (pin input line (at -12.7 2.54 0) (length 3.81)
          (name "SCK")
          (number "8")
        )
        (pin input line (at -12.7 7.62 0) (length 3.81)
          (name "DIN")
          (number "9")
        )
      )
    )
    (symbol "Connector:TestPoint" (pin_numbers hide) (pin_names (offset 0.762) hide) (in_bom yes) (on_board yes)
      (property "Reference" "TP" (id 0) (at 0 6.858 0))
      (property "Value" "TestPoint" (id 1) (at 0 5.08 0))
      (property "Footprint" "" (id 2) (at 5.08 0 0))
      (property "Datasheet" "~" (id 3) (at 5.08 0 0))
      (property "ki_keywords" "test point tp" (id 4) (at 0 0 0))
      (property "ki_description" "test point" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "Pin* Test*" (id 6) (at 0 0 0))
      (symbol "TestPoint_0_1"
        (circle (center 0 3.302) (radius 0.762)
          (fill (type none))
        )
      )
      (symbol "TestPoint_1_1"
        (pin passive line (at 0 0 90) (length 2.54)
          (name "1")
          (number "1")
        )
      )
    )
    (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))
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      (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"
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          (fill (type none))
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          (name "~")
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