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SN-L00/hardware/kicad/SN-L00.kicad_sch
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florian.berthold f100eb23bf Add KiCad schematic and updated BOM 
Schematic includes:
- Power section: SS14 reverse protection, AMS1117-3.3 LDO
- RP2040-Zero and OLED module headers
- Trigger output: 74LVC1G17 Schmitt buffer
- Return input: voltage divider, BAT54 clamps, MCP6001 buffer
- Button with pull-up, power LED

BOM updated with correct parts and LCSC numbers.
ASCII schematic reference in hardware/kicad/README.md.
2026-01-23 03:30:30 +01:00

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(kicad_sch
(version 20231120)
(generator "eeschema")
(generator_version "8.0")
(uuid "a0e1b2c3-d4e5-f6a7-b8c9-d0e1f2a3b4c5")
(paper "A4")
(title_block
(title "SN-L00 Latency Tester")
(date "2026-01-23")
(rev "0.1")
(company "SubModular / Sub-Net e.U.")
)
;; Power symbols
(symbol
(lib_id "power:+12V")
(at 25.4 25.4 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "pwr-12v-1")
(property "Reference" "#PWR01" (at 25.4 29.21 0) (effects (font (size 1.27 1.27)) hide))
(property "Value" "+12V" (at 25.4 22.86 0) (effects (font (size 1.27 1.27))))
)
(symbol
(lib_id "power:GND")
(at 25.4 76.2 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "pwr-gnd-1")
(property "Reference" "#PWR02" (at 25.4 82.55 0) (effects (font (size 1.27 1.27)) hide))
(property "Value" "GND" (at 25.4 80.01 0) (effects (font (size 1.27 1.27))))
)
(symbol
(lib_id "power:+3.3V")
(at 63.5 25.4 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "pwr-3v3-1")
(property "Reference" "#PWR03" (at 63.5 29.21 0) (effects (font (size 1.27 1.27)) hide))
(property "Value" "+3.3V" (at 63.5 22.86 0) (effects (font (size 1.27 1.27))))
)
;; Eurorack Power Header J1
(symbol
(lib_id "Connector_Generic:Conn_02x05_Odd_Even")
(at 25.4 50.8 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "j1-euro-pwr")
(property "Reference" "J1" (at 25.4 40.64 0) (effects (font (size 1.27 1.27))))
(property "Value" "Eurorack_Power" (at 25.4 60.96 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical" (at 25.4 50.8 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C429954" (at 25.4 50.8 0) (effects (font (size 1.27 1.27)) hide))
)
;; Schottky Diode D1 - Reverse polarity protection
(symbol
(lib_id "Device:D_Schottky")
(at 38.1 30.48 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "d1-schottky")
(property "Reference" "D1" (at 38.1 27.94 0) (effects (font (size 1.27 1.27))))
(property "Value" "SS14" (at 38.1 33.02 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Diode_SMD:D_SMA" (at 38.1 30.48 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C2480" (at 38.1 30.48 0) (effects (font (size 1.27 1.27)) hide))
)
;; LDO Regulator U1
(symbol
(lib_id "Regulator_Linear:AMS1117-3.3")
(at 50.8 30.48 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "u1-ldo")
(property "Reference" "U1" (at 50.8 22.86 0) (effects (font (size 1.27 1.27))))
(property "Value" "AMS1117-3.3" (at 50.8 25.4 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Package_TO_SOT_SMD:SOT-223-3_TabPin2" (at 50.8 30.48 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C6186" (at 50.8 30.48 0) (effects (font (size 1.27 1.27)) hide))
)
;; Input capacitors
(symbol
(lib_id "Device:C")
(at 43.18 38.1 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c1-input")
(property "Reference" "C1" (at 45.72 36.83 0) (effects (font (size 1.27 1.27))))
(property "Value" "10uF" (at 45.72 39.37 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 43.18 38.1 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C15850" (at 43.18 38.1 0) (effects (font (size 1.27 1.27)) hide))
)
;; Output capacitors
(symbol
(lib_id "Device:C")
(at 58.42 38.1 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c2-output")
(property "Reference" "C2" (at 60.96 36.83 0) (effects (font (size 1.27 1.27))))
(property "Value" "10uF" (at 60.96 39.37 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 58.42 38.1 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C15850" (at 58.42 38.1 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Device:C")
(at 63.5 38.1 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c3-output")
(property "Reference" "C3" (at 66.04 36.83 0) (effects (font (size 1.27 1.27))))
(property "Value" "100nF" (at 66.04 39.37 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0603_1608Metric" (at 63.5 38.1 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C14663" (at 63.5 38.1 0) (effects (font (size 1.27 1.27)) hide))
)
;; RP2040-Zero Module MOD1
(symbol
(lib_id "Connector_Generic:Conn_01x09")
(at 101.6 50.8 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "mod1-rp2040-left")
(property "Reference" "MOD1A" (at 101.6 35.56 0) (effects (font (size 1.27 1.27))))
(property "Value" "RP2040-Zero_Left" (at 101.6 68.58 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_Vertical" (at 101.6 50.8 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Connector_Generic:Conn_01x09")
(at 116.84 50.8 180)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "mod1-rp2040-right")
(property "Reference" "MOD1B" (at 116.84 35.56 0) (effects (font (size 1.27 1.27))))
(property "Value" "RP2040-Zero_Right" (at 116.84 68.58 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_Vertical" (at 116.84 50.8 0) (effects (font (size 1.27 1.27)) hide))
)
;; OLED Module MOD2
(symbol
(lib_id "Connector_Generic:Conn_01x04")
(at 139.7 50.8 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "mod2-oled")
(property "Reference" "MOD2" (at 139.7 43.18 0) (effects (font (size 1.27 1.27))))
(property "Value" "OLED_SSD1306" (at 139.7 60.96 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical" (at 139.7 50.8 0) (effects (font (size 1.27 1.27)) hide))
)
;; 74LVC1G17 Schmitt Trigger Buffer U2
(symbol
(lib_id "74xx_IEEE:74LVC1G17")
(at 152.4 101.6 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "u2-schmitt")
(property "Reference" "U2" (at 152.4 93.98 0) (effects (font (size 1.27 1.27))))
(property "Value" "74LVC1G17" (at 152.4 96.52 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Package_TO_SOT_SMD:SOT-23-5" (at 152.4 101.6 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C388628" (at 152.4 101.6 0) (effects (font (size 1.27 1.27)) hide))
)
;; MCP6001 Op-Amp U3
(symbol
(lib_id "Amplifier_Operational:MCP6001-OT")
(at 152.4 139.7 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "u3-opamp")
(property "Reference" "U3" (at 152.4 129.54 0) (effects (font (size 1.27 1.27))))
(property "Value" "MCP6001" (at 152.4 132.08 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Package_TO_SOT_SMD:SOT-23-5" (at 152.4 139.7 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C93025" (at 152.4 139.7 0) (effects (font (size 1.27 1.27)) hide))
)
;; Trigger Output Jack J2
(symbol
(lib_id "Connector:AudioJack2_Ground_Switch")
(at 177.8 101.6 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "j2-trig-out")
(property "Reference" "J2" (at 177.8 93.98 0) (effects (font (size 1.27 1.27))))
(property "Value" "TRIG_OUT" (at 177.8 109.22 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles" (at 177.8 101.6 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C2935955" (at 177.8 101.6 0) (effects (font (size 1.27 1.27)) hide))
)
;; Return Input Jack J3
(symbol
(lib_id "Connector:AudioJack2_Ground_Switch")
(at 177.8 139.7 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "j3-return-in")
(property "Reference" "J3" (at 177.8 132.08 0) (effects (font (size 1.27 1.27))))
(property "Value" "RETURN_IN" (at 177.8 147.32 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles" (at 177.8 139.7 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C2935955" (at 177.8 139.7 0) (effects (font (size 1.27 1.27)) hide))
)
;; Tactile Button SW1
(symbol
(lib_id "Switch:SW_Push")
(at 101.6 101.6 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "sw1-button")
(property "Reference" "SW1" (at 101.6 93.98 0) (effects (font (size 1.27 1.27))))
(property "Value" "BTN" (at 101.6 96.52 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Button_Switch_SMD:SW_Push_1P1T_NO_6x6mm_H9.5mm" (at 101.6 101.6 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C127509" (at 101.6 101.6 0) (effects (font (size 1.27 1.27)) hide))
)
;; Pull-up resistor for button
(symbol
(lib_id "Device:R")
(at 88.9 93.98 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r1-pullup")
(property "Reference" "R1" (at 91.44 92.71 0) (effects (font (size 1.27 1.27))))
(property "Value" "10K" (at 91.44 95.25 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 88.9 93.98 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C25804" (at 88.9 93.98 0) (effects (font (size 1.27 1.27)) hide))
)
;; Power LED D2
(symbol
(lib_id "Device:LED")
(at 76.2 55.88 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "d2-led")
(property "Reference" "D2" (at 80.01 54.61 0) (effects (font (size 1.27 1.27))))
(property "Value" "PWR_LED" (at 80.01 57.15 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "LED_SMD:LED_0603_1608Metric" (at 76.2 55.88 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C72043" (at 76.2 55.88 0) (effects (font (size 1.27 1.27)) hide))
)
;; LED current limiting resistor
(symbol
(lib_id "Device:R")
(at 76.2 45.72 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r2-led")
(property "Reference" "R2" (at 78.74 44.45 0) (effects (font (size 1.27 1.27))))
(property "Value" "1K" (at 78.74 46.99 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 76.2 45.72 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C21190" (at 76.2 45.72 0) (effects (font (size 1.27 1.27)) hide))
)
;; Series resistor for trigger output
(symbol
(lib_id "Device:R")
(at 165.1 101.6 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r3-trig")
(property "Reference" "R3" (at 165.1 99.06 0) (effects (font (size 1.27 1.27))))
(property "Value" "100R" (at 165.1 104.14 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 165.1 101.6 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C22775" (at 165.1 101.6 0) (effects (font (size 1.27 1.27)) hide))
)
;; Input protection resistor
(symbol
(lib_id "Device:R")
(at 127 139.7 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r4-input")
(property "Reference" "R4" (at 127 137.16 0) (effects (font (size 1.27 1.27))))
(property "Value" "10K" (at 127 142.24 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 127 139.7 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C25804" (at 127 139.7 0) (effects (font (size 1.27 1.27)) hide))
)
;; Voltage divider resistors for input (5V to 3.3V)
(symbol
(lib_id "Device:R")
(at 134.62 132.08 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r5-divider-top")
(property "Reference" "R5" (at 137.16 130.81 0) (effects (font (size 1.27 1.27))))
(property "Value" "10K" (at 137.16 133.35 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 134.62 132.08 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C25804" (at 134.62 132.08 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Device:R")
(at 134.62 149.86 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "r6-divider-bot")
(property "Reference" "R6" (at 137.16 148.59 0) (effects (font (size 1.27 1.27))))
(property "Value" "22K" (at 137.16 151.13 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Resistor_SMD:R_0603_1608Metric" (at 134.62 149.86 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C25774" (at 134.62 149.86 0) (effects (font (size 1.27 1.27)) hide))
)
;; Input protection diodes
(symbol
(lib_id "Device:D_Schottky")
(at 139.7 124.46 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "d3-clamp-high")
(property "Reference" "D3" (at 143.51 123.19 0) (effects (font (size 1.27 1.27))))
(property "Value" "BAT54" (at 143.51 125.73 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Diode_SMD:D_SOD-323" (at 139.7 124.46 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C181104" (at 139.7 124.46 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Device:D_Schottky")
(at 139.7 157.48 90)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "d4-clamp-low")
(property "Reference" "D4" (at 143.51 156.21 0) (effects (font (size 1.27 1.27))))
(property "Value" "BAT54" (at 143.51 158.75 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Diode_SMD:D_SOD-323" (at 139.7 157.48 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C181104" (at 139.7 157.48 0) (effects (font (size 1.27 1.27)) hide))
)
;; Decoupling caps for ICs
(symbol
(lib_id "Device:C")
(at 152.4 88.9 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c4-u2-decoup")
(property "Reference" "C4" (at 154.94 87.63 0) (effects (font (size 1.27 1.27))))
(property "Value" "100nF" (at 154.94 90.17 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0603_1608Metric" (at 152.4 88.9 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C14663" (at 152.4 88.9 0) (effects (font (size 1.27 1.27)) hide))
)
(symbol
(lib_id "Device:C")
(at 152.4 152.4 0)
(unit 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(uuid "c5-u3-decoup")
(property "Reference" "C5" (at 154.94 151.13 0) (effects (font (size 1.27 1.27))))
(property "Value" "100nF" (at 154.94 153.67 0) (effects (font (size 1.27 1.27))))
(property "Footprint" "Capacitor_SMD:C_0603_1608Metric" (at 152.4 152.4 0) (effects (font (size 1.27 1.27)) hide))
(property "LCSC" "C14663" (at 152.4 152.4 0) (effects (font (size 1.27 1.27)) hide))
)
;; Text annotations
(text "POWER SECTION" (at 40.64 15.24 0) (effects (font (size 2.54 2.54))))
(text "MCU & DISPLAY" (at 114.3 25.4 0) (effects (font (size 2.54 2.54))))
(text "TRIGGER OUTPUT" (at 152.4 78.74 0) (effects (font (size 2.54 2.54))))
(text "RETURN INPUT" (at 152.4 116.84 0) (effects (font (size 2.54 2.54))))
(text "BUTTON" (at 101.6 78.74 0) (effects (font (size 2.54 2.54))))
;; Net labels
(label "TRIG_OUT_MCU" (at 134.62 101.6 0) (effects (font (size 1.27 1.27))))
(label "RETURN_IN_MCU" (at 170.18 139.7 180) (effects (font (size 1.27 1.27))))
(label "BTN" (at 109.22 101.6 0) (effects (font (size 1.27 1.27))))
(label "SDA" (at 132.08 48.26 0) (effects (font (size 1.27 1.27))))
(label "SCL" (at 132.08 50.8 0) (effects (font (size 1.27 1.27))))
)
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