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chore: import upstream snapshot with attribution
2026-07-13 13:03:19 +08:00

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(export (version "E")
(design
(source "C:\\Users\\gayli\\Documents\\Work\\SnorkelAI\\Ohm Bench\\Review\\MicPreamp\\kicad_Mic PreampV2_circuit\\kicad_Mic PreampV2_circuit.kicad_sch")
(date "2026-03-25T21:22:22-1000")
(tool "Eeschema 9.0.7")
(sheet (number "1") (name "/") (tstamps "/")
(title_block
(title)
(company)
(rev)
(date)
(source "kicad_Mic PreampV2_circuit.kicad_sch")
(comment (number "1") (value ""))
(comment (number "2") (value ""))
(comment (number "3") (value ""))
(comment (number "4") (value ""))
(comment (number "5") (value ""))
(comment (number "6") (value ""))
(comment (number "7") (value ""))
(comment (number "8") (value ""))
(comment (number "9") (value "")))))
(components
(comp (ref "C1")
(value "4.7uF")
(datasheet "~")
(description "Polarized capacitor")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Polarized capacitor"))
(libsource (lib "Device") (part "C_Polarized") (description "Polarized capacitor"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "cap capacitor"))
(property (name "ki_fp_filters") (value "CP_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "19f15bfa-cb87-4746-b187-ee81eb8c2143"))
(comp (ref "C2")
(value "4.7uF")
(datasheet "~")
(description "Polarized capacitor")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Polarized capacitor"))
(libsource (lib "Device") (part "C_Polarized") (description "Polarized capacitor"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "cap capacitor"))
(property (name "ki_fp_filters") (value "CP_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "d02c14f3-eaac-46c5-ba80-dfed2604ea88"))
(comp (ref "C3")
(value "4.7uF")
(datasheet "~")
(description "Polarized capacitor")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Polarized capacitor"))
(libsource (lib "Device") (part "C_Polarized") (description "Polarized capacitor"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "cap capacitor"))
(property (name "ki_fp_filters") (value "CP_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "18504931-1bbb-41b9-bb76-b0048b3a2ee8"))
(comp (ref "D1")
(value "D_Schottky")
(datasheet "~")
(description "Schottky diode")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Schottky diode"))
(libsource (lib "Device") (part "D_Schottky") (description "Schottky diode"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "diode Schottky"))
(property (name "ki_fp_filters") (value "TO-???* *_Diode_* *SingleDiode* D_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "9c1f1bb2-9e9b-4b62-8e43-602749270454"))
(comp (ref "D2")
(value "D_Schottky")
(datasheet "~")
(description "Schottky diode")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Schottky diode"))
(libsource (lib "Device") (part "D_Schottky") (description "Schottky diode"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "diode Schottky"))
(property (name "ki_fp_filters") (value "TO-???* *_Diode_* *SingleDiode* D_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "56b7d90c-bbff-46a0-863e-ceee7a21842f"))
(comp (ref "J2")
(value "MIC_IN")
(datasheet "~")
(description "Audio Jack, 2 Poles (Mono / TS), Switched Pole (Normalling)")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Audio Jack, 2 Poles (Mono / TS), Switched Pole (Normalling)"))
(libsource (lib "Connector_Audio") (part "AudioJack2_Switch") (description "Audio Jack, 2 Poles (Mono / TS), Switched Pole (Normalling)"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "audio jack receptacle mono headphones phone TS connector"))
(property (name "ki_fp_filters") (value "Jack*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "cde6d4ae-e158-43af-bace-d30b692def80"))
(comp (ref "R1")
(value "56k")
(datasheet "~")
(description "Resistor, US symbol")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Resistor, US symbol"))
(libsource (lib "Device") (part "R_US") (description "Resistor, US symbol"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "R res resistor"))
(property (name "ki_fp_filters") (value "R_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "26c5ef79-8b3b-4e5f-9f39-acde522d705e"))
(comp (ref "R2")
(value "56k")
(datasheet "~")
(description "Resistor, US symbol")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Resistor, US symbol"))
(libsource (lib "Device") (part "R_US") (description "Resistor, US symbol"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "R res resistor"))
(property (name "ki_fp_filters") (value "R_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "d241578c-83a5-4f7d-8fdc-97ebd83c25c3"))
(comp (ref "R3")
(value "56k")
(datasheet "~")
(description "Resistor, US symbol")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Resistor, US symbol"))
(libsource (lib "Device") (part "R_US") (description "Resistor, US symbol"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "R res resistor"))
(property (name "ki_fp_filters") (value "R_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "5ad8773c-5d68-4d83-8153-32441b717ce7"))
(comp (ref "R4")
(value "1k1")
(datasheet "~")
(description "Resistor, US symbol")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Resistor, US symbol"))
(libsource (lib "Device") (part "R_US") (description "Resistor, US symbol"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "R res resistor"))
(property (name "ki_fp_filters") (value "R_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "07462a38-9026-4b01-8ea1-10cacd5ef1d0"))
(comp (ref "R6")
(value "1k1")
(datasheet "~")
(description "Resistor, US symbol")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Resistor, US symbol"))
(libsource (lib "Device") (part "R_US") (description "Resistor, US symbol"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "R res resistor"))
(property (name "ki_fp_filters") (value "R_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "4b428963-6f25-473c-a607-0658f4437f06"))
(comp (ref "R7")
(value "1k1")
(datasheet "~")
(description "Resistor, US symbol")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Resistor, US symbol"))
(libsource (lib "Device") (part "R_US") (description "Resistor, US symbol"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "R res resistor"))
(property (name "ki_fp_filters") (value "R_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "18daf6ba-4933-438f-ae83-acce98491d56"))
(comp (ref "R8")
(value "18k")
(datasheet "~")
(description "Resistor, US symbol")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Resistor, US symbol"))
(libsource (lib "Device") (part "R_US") (description "Resistor, US symbol"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "R res resistor"))
(property (name "ki_fp_filters") (value "R_*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "69dc0478-efd7-4b98-9315-b33b9fab144f"))
(comp (ref "RV1")
(value "50k")
(datasheet "~")
(description "Potentiometer, US symbol")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Potentiometer, US symbol"))
(libsource (lib "Device") (part "R_Potentiometer_US") (description "Potentiometer, US symbol"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "resistor variable"))
(property (name "ki_fp_filters") (value "Potentiometer*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "70124630-435e-4828-bd81-3366f191df97"))
(comp (ref "U1")
(value "LM741")
(datasheet "http://www.ti.com/lit/ds/symlink/lm741.pdf")
(description "Operational Amplifier, DIP-8/TO-99-8")
(fields
(field (name "Footprint"))
(field (name "Datasheet") "http://www.ti.com/lit/ds/symlink/lm741.pdf")
(field (name "Description") "Operational Amplifier, DIP-8/TO-99-8"))
(libsource (lib "Amplifier_Operational") (part "LM741") (description "Operational Amplifier, DIP-8/TO-99-8"))
(property (name "Sheetname") (value "Root"))
(property (name "Sheetfile") (value "kicad_Mic PreampV2_circuit.kicad_sch"))
(property (name "ki_keywords") (value "single opamp"))
(property (name "ki_fp_filters") (value "SOIC*3.9x4.9mm*P1.27mm* DIP*W7.62mm* TSSOP*3x3mm*P0.65mm*"))
(sheetpath (names "/") (tstamps "/"))
(tstamps "bef4b309-8bbc-4a92-a50b-8818c4aa8af6")))
(libparts
(libpart (lib "Amplifier_Operational") (part "LM741")
(description "Operational Amplifier, DIP-8/TO-99-8")
(docs "http://www.ti.com/lit/ds/symlink/lm741.pdf")
(footprints
(fp "SOIC*3.9x4.9mm*P1.27mm*")
(fp "DIP*W7.62mm*")
(fp "TSSOP*3x3mm*P0.65mm*"))
(fields
(field (name "Reference") "U")
(field (name "Value") "LM741")
(field (name "Footprint"))
(field (name "Datasheet") "http://www.ti.com/lit/ds/symlink/lm741.pdf")
(field (name "Description") "Operational Amplifier, DIP-8/TO-99-8"))
(pins
(pin (num "1") (name "NULL") (type "input"))
(pin (num "2") (name "-") (type "input"))
(pin (num "3") (name "+") (type "input"))
(pin (num "4") (name "V-") (type "power_in"))
(pin (num "5") (name "NULL") (type "input"))
(pin (num "6") (name "") (type "output"))
(pin (num "7") (name "V+") (type "power_in"))
(pin (num "8") (name "NC") (type "no_connect"))))
(libpart (lib "Connector_Audio") (part "AudioJack2_Switch")
(description "Audio Jack, 2 Poles (Mono / TS), Switched Pole (Normalling)")
(docs "~")
(footprints
(fp "Jack*"))
(fields
(field (name "Reference") "J")
(field (name "Value") "AudioJack2_Switch")
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Audio Jack, 2 Poles (Mono / TS), Switched Pole (Normalling)"))
(pins
(pin (num "S") (name "") (type "passive"))
(pin (num "SN") (name "") (type "passive"))
(pin (num "T") (name "") (type "passive"))
(pin (num "TN") (name "") (type "passive"))))
(libpart (lib "Device") (part "C_Polarized")
(description "Polarized capacitor")
(docs "~")
(footprints
(fp "CP_*"))
(fields
(field (name "Reference") "C")
(field (name "Value") "C_Polarized")
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Polarized capacitor"))
(pins
(pin (num "1") (name "") (type "passive"))
(pin (num "2") (name "") (type "passive"))))
(libpart (lib "Device") (part "D_Schottky")
(description "Schottky diode")
(docs "~")
(footprints
(fp "TO-???*")
(fp "*_Diode_*")
(fp "*SingleDiode*")
(fp "D_*"))
(fields
(field (name "Reference") "D")
(field (name "Value") "D_Schottky")
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Schottky diode"))
(pins
(pin (num "1") (name "K") (type "passive"))
(pin (num "2") (name "A") (type "passive"))))
(libpart (lib "Device") (part "R_Potentiometer_US")
(description "Potentiometer, US symbol")
(docs "~")
(footprints
(fp "Potentiometer*"))
(fields
(field (name "Reference") "RV")
(field (name "Value") "R_Potentiometer_US")
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Potentiometer, US symbol"))
(pins
(pin (num "1") (name "1") (type "passive"))
(pin (num "2") (name "2") (type "passive"))
(pin (num "3") (name "3") (type "passive"))))
(libpart (lib "Device") (part "R_US")
(description "Resistor, US symbol")
(docs "~")
(footprints
(fp "R_*"))
(fields
(field (name "Reference") "R")
(field (name "Value") "R_US")
(field (name "Footprint"))
(field (name "Datasheet") "~")
(field (name "Description") "Resistor, US symbol"))
(pins
(pin (num "1") (name "") (type "passive"))
(pin (num "2") (name "") (type "passive")))))
(libraries
(library (logical "Amplifier_Operational")
(uri "C:\\Program Files\\KiCad\\9.0\\share\\kicad\\symbols\\/Amplifier_Operational.kicad_sym"))
(library (logical "Connector_Audio")
(uri "C:\\Program Files\\KiCad\\9.0\\share\\kicad\\symbols\\/Connector_Audio.kicad_sym"))
(library (logical "Device")
(uri "C:\\Program Files\\KiCad\\9.0\\share\\kicad\\symbols\\/Device.kicad_sym")))
(nets
(net (code "1") (name "+3.3VADC") (class "Default")
(node (ref "D1") (pin "1") (pinfunction "K") (pintype "passive"))
(node (ref "R8") (pin "1") (pintype "passive")))
(net (code "2") (name "+12V") (class "Default")
(node (ref "R1") (pin "1") (pintype "passive"))
(node (ref "R2") (pin "1") (pintype "passive"))
(node (ref "U1") (pin "7") (pinfunction "V+") (pintype "power_in")))
(net (code "3") (name "GND") (class "Default")
(node (ref "C2") (pin "2") (pintype "passive"))
(node (ref "D2") (pin "2") (pinfunction "A") (pintype "passive"))
(node (ref "J2") (pin "S") (pintype "passive"))
(node (ref "R3") (pin "2") (pintype "passive"))
(node (ref "R6") (pin "2") (pintype "passive"))
(node (ref "R7") (pin "2") (pintype "passive"))
(node (ref "U1") (pin "4") (pinfunction "V-") (pintype "power_in")))
(net (code "4") (name "Net-(C1-Pad1)") (class "Default")
(node (ref "C1") (pin "1") (pintype "passive"))
(node (ref "J2") (pin "T") (pintype "passive"))
(node (ref "R1") (pin "2") (pintype "passive")))
(net (code "5") (name "Net-(C2-Pad1)") (class "Default")
(node (ref "C2") (pin "1") (pintype "passive"))
(node (ref "R4") (pin "2") (pintype "passive")))
(net (code "6") (name "Net-(C3-Pad1)") (class "Default")
(node (ref "C3") (pin "1") (pintype "passive"))
(node (ref "R6") (pin "1") (pintype "passive"))
(node (ref "RV1") (pin "1") (pinfunction "1") (pintype "passive"))
(node (ref "U1") (pin "6") (pintype "output")))
(net (code "7") (name "Net-(J2-PadSN)") (class "Default")
(node (ref "J2") (pin "SN") (pintype "passive"))
(node (ref "J2") (pin "TN") (pintype "passive")))
(net (code "8") (name "Net-(U1-+)") (class "Default")
(node (ref "C1") (pin "2") (pintype "passive"))
(node (ref "R2") (pin "2") (pintype "passive"))
(node (ref "R3") (pin "1") (pintype "passive"))
(node (ref "U1") (pin "3") (pinfunction "+") (pintype "input")))
(net (code "9") (name "Net-(U1--)") (class "Default")
(node (ref "R4") (pin "1") (pintype "passive"))
(node (ref "RV1") (pin "2") (pinfunction "2") (pintype "passive"))
(node (ref "U1") (pin "2") (pinfunction "-") (pintype "input")))
(net (code "10") (name "Vout") (class "Default")
(node (ref "C3") (pin "2") (pintype "passive"))
(node (ref "D1") (pin "2") (pinfunction "A") (pintype "passive"))
(node (ref "D2") (pin "1") (pinfunction "K") (pintype "passive"))
(node (ref "R7") (pin "1") (pintype "passive"))
(node (ref "R8") (pin "2") (pintype "passive")))
(net (code "11") (name "unconnected-(RV1-Pad3)") (class "Default")
(node (ref "RV1") (pin "3") (pinfunction "3") (pintype "passive+no_connect")))
(net (code "12") (name "unconnected-(U1-NC-Pad8)") (class "Default")
(node (ref "U1") (pin "8") (pinfunction "NC") (pintype "no_connect")))
(net (code "13") (name "unconnected-(U1-NULL-Pad1)") (class "Default")
(node (ref "U1") (pin "1") (pinfunction "NULL") (pintype "input+no_connect")))
(net (code "14") (name "unconnected-(U1-NULL-Pad5)") (class "Default")
(node (ref "U1") (pin "5") (pinfunction "NULL") (pintype "input+no_connect")))))