(kicad_sch (version 20211123) (generator eeschema)
  (paper "A4")
  (lib_symbols
    (symbol "Amplifier_Audio:LM386" (pin_names (offset 0.127)) (in_bom yes) (on_board yes)
      (property "Reference" "U" (id 0) (at 1.27 7.62 0))
      (property "Value" "LM386" (id 1) (at 1.27 5.08 0))
      (property "Footprint" "" (id 2) (at 2.54 2.54 0))
      (property "Datasheet" "http://www.ti.com/lit/ds/symlink/lm386.pdf" (id 3) (at 5.08 5.08 0))
      (property "ki_keywords" "single Power opamp" (id 4) (at 0 0 0))
      (property "ki_description" "Low Voltage Audio Power Amplifier, DIP-8/SOIC-8/SSOP-8" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "SOIC*3.9x4.9mm*P1.27mm* DIP*W7.62mm* MSSOP*P0.65mm* TSSOP*3x3mm*P0.5mm*" (id 6) (at 0 0 0))
      (symbol "LM386_0_1"
        (polyline
          (pts
            (xy 5.08 0)
            (xy -5.08 5.08)
            (xy -5.08 -5.08)
            (xy 5.08 0)
          )
          (fill (type background))
        )
      )
      (symbol "LM386_1_1"
        (pin input line (at 0 -7.62 90) (length 5.08)
          (name "GAIN")
          (number "1")
        )
        (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")
        )
        (pin power_in line (at -2.54 -7.62 90) (length 3.81)
          (name "GND")
          (number "4")
        )
        (pin output line (at 7.62 0 180) (length 2.54)
          (name "~")
          (number "5")
        )
        (pin power_in line (at -2.54 7.62 270) (length 3.81)
          (name "V+")
          (number "6")
        )
        (pin input line (at 0 7.62 270) (length 5.08)
          (name "BYPASS")
          (number "7")
        )
        (pin input line (at 2.54 -7.62 90) (length 6.35)
          (name "GAIN")
          (number "8")
        )
      )
    )
    (symbol "Connector:Conn_01x03_Male" (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_01x03_Male" (id 1) (at 0 -5.08 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, 01x03, 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_01x03_Male_1_1"
        (polyline
          (pts
            (xy 1.27 -2.54)
            (xy 0.8636 -2.54)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 1.27 0)
            (xy 0.8636 0)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 1.27 2.54)
            (xy 0.8636 2.54)
          )
          (fill (type none))
        )
        (rectangle (start 0.8636 -2.413) (end 0 -2.667)
          (fill (type outline))
        )
        (rectangle (start 0.8636 0.127) (end 0 -0.127)
          (fill (type outline))
        )
        (rectangle (start 0.8636 2.667) (end 0 2.413)
          (fill (type outline))
        )
        (pin passive line (at 5.08 2.54 180) (length 3.81)
          (name "Pin_1")
          (number "1")
        )
        (pin passive line (at 5.08 0 180) (length 3.81)
          (name "Pin_2")
          (number "2")
        )
        (pin passive line (at 5.08 -2.54 180) (length 3.81)
          (name "Pin_3")
          (number "3")
        )
      )
    )
    (symbol "Device:Battery" (pin_numbers hide) (pin_names (offset 0) hide) (in_bom yes) (on_board yes)
      (property "Reference" "BT" (id 0) (at 2.54 2.54 0))
      (property "Value" "Battery" (id 1) (at 2.54 0 0))
      (property "Footprint" "" (id 2) (at 0 1.524 90))
      (property "Datasheet" "~" (id 3) (at 0 1.524 90))
      (property "ki_keywords" "batt voltage-source cell" (id 4) (at 0 0 0))
      (property "ki_description" "Multiple-cell battery" (id 5) (at 0 0 0))
      (symbol "Battery_0_1"
        (rectangle (start -2.032 -1.397) (end 2.032 -1.651)
          (fill (type outline))
        )
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          (fill (type outline))
        )
        (rectangle (start -1.3208 -1.9812) (end 1.27 -2.4892)
          (fill (type outline))
        )
        (rectangle (start -1.3208 1.1938) (end 1.27 0.6858)
          (fill (type outline))
        )
        (polyline
          (pts
            (xy 0 -1.524)
            (xy 0 -1.27)
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          (fill (type none))
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        (polyline
          (pts
            (xy 0 -1.016)
            (xy 0 -0.762)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 -0.508)
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          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 0)
            (xy 0 0.254)
          )
          (fill (type none))
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        (polyline
          (pts
            (xy 0 0.508)
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          )
          (fill (type none))
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        (polyline
          (pts
            (xy 0 1.778)
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          (fill (type none))
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        (polyline
          (pts
            (xy 0.254 2.667)
            (xy 1.27 2.667)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0.762 3.175)
            (xy 0.762 2.159)
          )
          (fill (type none))
        )
      )
      (symbol "Battery_1_1"
        (pin passive line (at 0 5.08 270) (length 2.54)
          (name "+")
          (number "1")
        )
        (pin passive line (at 0 -5.08 90) (length 2.54)
          (name "-")
          (number "2")
        )
      )
    )
    (symbol "Device:C_Polarized" (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_Polarized" (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" "Polarized capacitor" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "CP_*" (id 6) (at 0 0 0))
      (symbol "C_Polarized_0_1"
        (rectangle (start -2.286 0.508) (end 2.286 1.016)
          (fill (type none))
        )
        (polyline
          (pts
            (xy -1.778 2.286)
            (xy -0.762 2.286)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy -1.27 2.794)
            (xy -1.27 1.778)
          )
          (fill (type none))
        )
        (rectangle (start 2.286 -0.508) (end -2.286 -1.016)
          (fill (type outline))
        )
      )
      (symbol "C_Polarized_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:C_Small" (pin_numbers hide) (pin_names (offset 0.254) hide) (in_bom yes) (on_board yes)
      (property "Reference" "C" (id 0) (at 0.254 1.778 0))
      (property "Value" "C_Small" (id 1) (at 0.254 -2.032 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "ki_keywords" "capacitor cap" (id 4) (at 0 0 0))
      (property "ki_description" "Unpolarized capacitor, small symbol" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "C_*" (id 6) (at 0 0 0))
      (symbol "C_Small_0_1"
        (polyline
          (pts
            (xy -1.524 -0.508)
            (xy 1.524 -0.508)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy -1.524 0.508)
            (xy 1.524 0.508)
          )
          (fill (type none))
        )
      )
      (symbol "C_Small_1_1"
        (pin passive line (at 0 2.54 270) (length 2.032)
          (name "~")
          (number "1")
        )
        (pin passive line (at 0 -2.54 90) (length 2.032)
          (name "~")
          (number "2")
        )
      )
    )
    (symbol "Device:Microphone_Condenser" (pin_names (offset 0.0254) hide) (in_bom yes) (on_board yes)
      (property "Reference" "MK" (id 0) (at -3.302 1.27 0))
      (property "Value" "Microphone_Condenser" (id 1) (at -3.302 -0.635 0))
      (property "Footprint" "" (id 2) (at 0 2.54 90))
      (property "Datasheet" "~" (id 3) (at 0 2.54 90))
      (property "ki_keywords" "capacitance condenser microphone" (id 4) (at 0 0 0))
      (property "ki_description" "Condenser microphone" (id 5) (at 0 0 0))
      (symbol "Microphone_Condenser_0_1"
        (polyline
          (pts
            (xy -2.54 2.54)
            (xy -2.54 -2.54)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 -0.762)
            (xy 0 -1.524)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 0.762)
            (xy 0 1.524)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0.254 3.81)
            (xy 0.762 3.81)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0.508 4.064)
            (xy 0.508 3.556)
          )
          (fill (type none))
        )
        (circle (center 0 0) (radius 2.54)
          (fill (type none))
        )
        (rectangle (start 1.016 -0.254) (end -1.016 -0.762)
          (fill (type outline))
        )
        (rectangle (start 1.016 0.762) (end -1.016 0.254)
          (fill (type outline))
        )
      )
      (symbol "Microphone_Condenser_1_1"
        (pin passive line (at 0 -5.08 90) (length 2.54)
          (name "-")
          (number "1")
        )
        (pin passive line (at 0 5.08 270) (length 2.54)
          (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 "Device:R_Potentiometer" (pin_names (offset 1.016) hide) (in_bom yes) (on_board yes)
      (property "Reference" "RV" (id 0) (at -4.445 0 90))
      (property "Value" "R_Potentiometer" (id 1) (at -2.54 0 90))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "ki_keywords" "resistor variable" (id 4) (at 0 0 0))
      (property "ki_description" "Potentiometer" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "Potentiometer*" (id 6) (at 0 0 0))
      (symbol "R_Potentiometer_0_1"
        (polyline
          (pts
            (xy 2.54 0)
            (xy 1.524 0)
          )
          (fill (type none))
        )
        (polyline
          (pts
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            (xy 2.286 -0.508)
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          (fill (type outline))
        )
        (rectangle (start 1.016 2.54) (end -1.016 -2.54)
          (fill (type none))
        )
      )
      (symbol "R_Potentiometer_1_1"
        (pin passive line (at 0 3.81 270) (length 1.27)
          (name "1")
          (number "1")
        )
        (pin passive line (at 3.81 0 180) (length 1.27)
          (name "2")
          (number "2")
        )
        (pin passive line (at 0 -3.81 90) (length 1.27)
          (name "3")
          (number "3")
        )
      )
    )
    (symbol "Regulator_Linear:L78L05_TO92" (pin_names (offset 0.254)) (in_bom yes) (on_board yes)
      (property "Reference" "U" (id 0) (at -3.81 3.175 0))
      (property "Value" "L78L05_TO92" (id 1) (at 0 3.175 0))
      (property "Footprint" "Package_TO_SOT_THT:TO-92_Inline" (id 2) (at 0 5.715 0))
      (property "Datasheet" "http://www.st.com/content/ccc/resource/technical/document/datasheet/15/55/e5/aa/23/5b/43/fd/CD00000446.pdf/files/CD00000446.pdf/jcr:content/translations/en.CD00000446.pdf" (id 3) (at 0 -1.27 0))
      (property "ki_keywords" "Voltage Regulator 100mA Positive" (id 4) (at 0 0 0))
      (property "ki_description" "Positive 100mA 30V Linear Regulator, Fixed Output 5V, TO-92" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "TO?92*" (id 6) (at 0 0 0))
      (symbol "L78L05_TO92_0_1"
        (rectangle (start -5.08 -5.08) (end 5.08 1.905)
          (fill (type background))
        )
      )
      (symbol "L78L05_TO92_1_1"
        (pin power_out line (at 7.62 0 180) (length 2.54)
          (name "VO")
          (number "1")
        )
        (pin power_in line (at 0 -7.62 90) (length 2.54)
          (name "GND")
          (number "2")
        )
        (pin power_in line (at -7.62 0 0) (length 2.54)
          (name "VI")
          (number "3")
        )
      )
    )
    (symbol "Regulator_Switching:NMA0515SC" (in_bom yes) (on_board yes)
      (property "Reference" "U4" (id 0) (at 0 12.7 0))
      (property "Value" "NMA0515SC" (id 1) (at 0 10.16 0))
      (property "Footprint" "" (id 2) (at 0 -8.89 0))
      (property "Datasheet" "" (id 3) (at 0 0 0))
      (property "ki_keywords" "Murata isolated isolation dc-dc converter" (id 4) (at 0 0 0))
      (property "ki_description" "+/-33mA Isolated 1W Dual output DC/DC Converter Module, 5V Input Voltage, +/-15V Output Voltage, SIP3" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "Converter*DCDC*Murata*NMAxxxxSC*" (id 6) (at 0 0 0))
      (symbol "NMA0515SC_0_1"
        (rectangle (start -10.16 -7.62) (end 10.16 7.62)
          (fill (type background))
        )
        (polyline
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          (number "1")
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          (name "VIN-")
          (number "2")
        )
        (pin power_out line (at -12.7 -5.08 0) (length 2.54)
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          (number "4")
        )
        (pin power_out line (at -12.7 0 0) (length 2.54)
          (name "0V")
          (number "5")
        )
        (pin power_out line (at -12.7 5.08 0) (length 2.54)
          (name "VOUT+")
          (number "6")
        )
      )
    )
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      (property "ki_keywords" "NPN low noise transistor" (id 4) (at 0 0 0))
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          (number "1")
        )
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    )
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      (property "Datasheet" "" (id 3) (at 0 0 0))
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      (property "ki_description" "Power symbol creates a global label with name \"-15V\"" (id 5) (at 0 0 0))
      (symbol "-15V_0_0"
        (pin power_in line (at 0 0 90) (length 0) hide
          (name "-15V")
          (number "1")
        )
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