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2 layers160.4 × 386.8 mmNote sequencer, the printed circuit board in 3D

Note sequencer

gridbugs/modular2
Open in PCBKitView on GitHub.kicad_pcb
Size
160.4 × 386.8 mm
Copper layers
2
Thickness
1.6 mm
Parts
128
Nets
115
Pads
422
Tracks, vias
596, 0
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
22 Nov 2025
Updated
7 Nov 2026

Overview

Note sequencer is an open-source printed circuit board by gridbugs, from the gridbugs/modular2 repository on GitHub, published under the MIT licence. It is a 2-layer board of 160.4 × 386.8 mm with 128 parts on 115 nets, routed with 596 tracks and 0 vias.

It is built around the TL072. Its parts include 35 switches, 32 diodes, 14 connectors, 9 resistors and 4 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.

Main components

1

README

low-pass-filter/README.md

Low-pass Filter

Quirks

V1

  • The "Cutoff" potentiometer is reversed.

Parts

128
QtyValueFootprintReferences
311N4148Diode_THT:D_DO-35_SOD27_P7.62mm_HorizontalD2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24 +15
51KResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR2, R3, R5, R6, R7
3PowerConnector_IDC:IDC-Header_2x03_P2.54mm_VerticalJ3, J4, J5
2100nFCapacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mmC1, C2
210KPotentiometer_THT:Potentiometer_Bourns_3296W_VerticalRV1, RV2
24.7KResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR8, R9
25.1KResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR1, R4
2Arduino_Nano_v3.xModule:Arduino_NanoA1, A2
2C2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW22, SW28
2Clockmodular2:banana-jackJ8, J12
2Gatemodular2:banana-jackJ2, J10
2Pitchmodular2:banana-jackJ1, J9
2SW_DIP_x01Button_Switch_THT:SW_DIP_SPSTx01_Slide_9.78x4.72mm_W7.62mm_P2.54mmSW1, SW2
2Velocitymodular2:banana-jackJ7, J11
2~modular2:mcp4725_breakoutU2, U4
1100nfCapacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mmC3
1A#1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW14
1A#2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW27
1A1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW20
1A2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW33
1B1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW21
1B2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW34
1C#1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW10
1C#2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW23
1C1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW15
1C3Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW35
1Clock Sourcemodular2:switch1SW9
1Conn_01x06_PinConnector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_VerticalJ14
1Conn_01x06_SocketConnector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_VerticalJ6
1D#1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW11
1D#2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW24
1D1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW16
1D2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW29
1E1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW18
1E2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW30
1F#1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW12
1F#2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW25
1F1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW17
1F2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW31
1G#1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW13
1G#2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW26
1G1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW19
1G2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW32
1LEDLED_THT:LED_D5.0mmD1
1LED SocketConnector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_VerticalJ13
1LOGOmodular2:ibis-smallG***
1Modemodular2:switch1SW8
1RotaryEncoder_SwitchRotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mmSW7
1TL072Package_DIP:DIP-8_W7.62mm_SocketU1
1X1Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW3
1X2Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW4
1X3Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW6
1X4Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCBSW5
1~modular2:st7735U3

The 102 most common of 128 parts.

Questions

How big is the Note sequencer PCB?

It measures 160.4 × 386.8 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Note sequencer use?

128 parts, built around the TL072. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Note sequencer KiCad files?

From the gridbugs/modular2 repository on GitHub, at the commit this page was made from: the board is note-sequencer/note-sequencer.kicad_pcb and its schematic arduino-delay/arduino-delay.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Note sequencer design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

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