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2 layers86.4 × 58.4 mmHackableDelay, the printed circuit board in 3D

A hackable delay circuit for eurorack modular synthesizers, designed in KiCad.

Size
86.4 × 58.4 mm
Copper layers
2
Thickness
1.6 mm
Parts
65
Nets
41
Pads
161
Tracks, vias
178, 0
Pours
1
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
30 Jun 2026
Updated
27 Aug 2026

Overview

HackableDelay is an open-source printed circuit board by benjiaomodular, from the benjiaomodular/HackableDelay repository on GitHub. It is a 2-layer board of 86.4 × 58.4 mm with 65 parts on 41 nets, routed with 178 tracks and 0 vias.

It is built around the PT2399, TL072 and LM1117T-5.0. Its parts include 23 capacitors, 20 resistors, 5 connectors, 3 ICs and 1 diode.

Main components

3

README

README.md

Hackable Delay

A hackable delay circuit for eurorack modular synthesizers, designed in KiCad.

HackableDelay HackableDelay

Files

  • HackableDelay.kicad_sch — schematic
  • HackableDelay.kicad_pcb — PCB layout
  • HackableDelay.kicad_pro — KiCad project file

Schematic

HackableDelay Schematic

Tools

Fabrication

The Fabrication folder contains ready-to-order Gerber/drill packages (e.g. HackableDelay v1.1.zip) for the PCB itself. To get a working module you'll also need panel graphics and a parts order.

Ordering the PCB

  1. Download the zip for the version you want to build from Fabrication/.
  2. Upload it as-is to your fab of choice (e.g. JLCPCB, PCBWay) — no need to unzip, most fab houses accept the zip directly.
  3. Recommended settings: 2 layers, 1.6mm thickness, HASL or ENIG finish. Silkscreen/soldermask color is up to you.
  4. The zip includes:
    • *-F_Cu.gbr / *-B_Cu.gbr — copper layers
    • *-F_Mask.gbr / *-B_Mask.gbr — soldermask
    • *-F_Silkscreen.gbr / *-B_Silkscreen.gbr — silkscreen
    • *-Edge_Cuts.gbr — board outline
    • *-PTH.drl / *-NPTH.drl — plated/non-plated drill files
    • *-job.gbrjob — job file describing the stackup

Panel graphics

HackableDelay - Front Graphics.svg and HackableDelay - Back Graphics.svg are the faceplate/panel artwork. Individual layer previews (copper, mask, paste, silkscreen, edge cuts) are also available as SVGs in SVG/ if you want to inspect or edit specific layers.

Bill of materials

HackableDelay - BOM.csv lists all components with references, values, footprints, and quantities. HackableDelay - BOM with Shopee Links.xlsx is the same BOM with sourcing links (Philippines/Shopee-specific — substitute equivalents from your preferred supplier). An HTML version is available in bom/.

Older versions

Previous board revisions are kept under Legacy Versions/ for reference; use the files in the repo root and Fabrication/ for the current version unless you specifically need an older layout.

License

Creative Commons Attribution 4.0 International (CC BY 4.0)

You are free to share and adapt this design for any purpose, including commercially, as long as you give appropriate credit.

© Benjie Jiao x SOMATOSONIC / benjiaomodular

Parts

65
QtyValueFootprintReferences
910kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR2, R3, R5, R6, R7, R9, R10, R11, R17
4100nFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC2, C4, C8, C9
41uFCapacitor_THT:CP_Radial_D6.3mm_P2.50mmC13, C17, C19, C23
4MountingHole_PadMountingHole:MountingHole_3.2mm_M3_Pad_TopBottomH1, H2, H3, H4
31kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR1, R13, R19
320kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR8, R14, R15
3B100Kbenjiaomodular:PinHeader_1x03_P2.54mm_VerticalLEVEL1, REPEATS1, TIME1
3SolderJumper_2_BridgedJumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mmJP1, JP2, JP3
210nFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC15, C18
210uFCapacitor_THT:CP_Radial_D6.3mm_P2.50mmC6, C12
22.2nFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC10, C11
24.7nFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC14, C16
247uFCapacitor_THT:CP_Radial_D6.3mm_P2.50mmC1, C5
2Conn_01x02_Pinbenjiaomodular:SolderPads_1x02_P2.54mmMOD1, MOD2
2Conn_01x03_Pinbenjiaomodular:SolderPads_1x03_P2.54mmJ4, J5
1100kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR20
1100pFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC20
11MResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR4
12.7kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR12
122nFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC21
122pFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC7
12kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR18
14.7uFCapacitor_THT:CP_Radial_D6.3mm_P2.50mmC3
147nFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC22
15.1kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR16
1B1Mbenjiaomodular:PinHeader_1x03_P2.54mm_VerticalGAIN1
1INPUTbenjiaomodular:PinHeader_1x02_P2.54mm_VerticalJ2
1Jack-DCbenjiaomodular:PinHeader_1x02_P2.54mm_VerticalJ1
1LEDLED_THT:LED_D5.0mmD1
1LM1117T-5.0Package_TO_SOT_THT:TO-220-3_VerticalU3
1OUTPUTbenjiaomodular:PinHeader_1x02_P2.54mm_VerticalJ3
1PT2399Package_DIP:DIP-16_W7.62mm_Socket_LongPadsU2
1TL072Package_DIP:DIP-8_W7.62mm_Socket_LongPadsU1

Questions

How big is the HackableDelay PCB?

It measures 86.4 × 58.4 mm and has 2 copper layers, 1.6 mm thick.

What parts does the HackableDelay use?

65 parts, built around the PT2399, TL072 and LM1117T-5.0. 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 HackableDelay KiCad files?

From the benjiaomodular/HackableDelay repository on GitHub, at the commit this page was made from: the board is Legacy Versions/v1.0/HackableDelay.kicad_pcb and its schematic HackableDelay.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the HackableDelay design in my own project?

Its repository states no licence, so its author keeps all rights: ask benjiaomodular before reusing the design.

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