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2 layers30 × 100 mmAttenuverter, the printed circuit board in 3D

Attenuverter

Schenktronics/ST03-attenuverter

A 4 channel eurorack attenuverter

Full screenGitHub.kicad_pcb
Size
30 × 100 mm
Copper layers
2
Thickness
1.6 mm
Parts
73
Nets
39
Pads
192
Tracks, vias
454, 61
Pours
2
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
25 Nov 2019
Updated
1 Nov 2026

Overview

Attenuverter is an open-source printed circuit board by Schenktronics, from the Schenktronics/ST03-attenuverter repository on GitHub. It is a 2-layer board of 30 × 100 mm with 73 parts on 39 nets, routed with 454 tracks and 61 vias.

It is built around the TL074HID, LM4040D50IDBZR and 1N4148WS-7-F-CN. Its parts include 29 resistors, 13 capacitors, 11 diodes, 9 connectors and 2 ICs. It belongs with the audio and music boards of this library.

Main components

3

README

README.md
Schenktronics

ST-03 Attenuverter

A 6HP Eurorack quad attenuverter from Schenktronics. Each of its four channels scales a signal anywhere from x1, through zero, to x-1 (inverted). Every input is normalled to +5 V, so with nothing plugged in, each channel is a manual offset from -5 V to +5 V.

Attenuverter front panel

Features

  • 6HP, 20 mm deep. 16 mA on +12 V and 9 mA on -12 V.
  • Four channels, each turning a signal down, off, or inverting it
  • Knobs with a printed zero mark at the top of their travel
  • Inputs normalled to +5 V: four manual offset voltages when nothing's plugged in
  • Reverse-power protection on both rails
  • Kits come with the surface-mount parts already soldered and tested: 54 through-hole joints to build

Documentation

DocumentForPDF
User ManualUsing the modulePDF
Assembly GuideBuilding the kitPDF
Bill of Materials (CSV)Parts and sourcing

Repository layout

text
hardware/
  ST-03_Attenuverter.step          3D model of the assembled module
  attenuverter/                    Main PCB (KiCad 10)
    Attenuverter.kicad_sch           Schematic
    Attenuverter.kicad_pcb           PCB layout
    Attenuverter.step                3D model
    attenuverter BOM.xlsx            Original BOM spreadsheet
  panel/                           Faceplate (KiCad 10, made as an aluminum PCB)
    AttenuverterFaceplate.kicad_pcb  Faceplate layout
    AttenuverterFaceplate.step       3D model
docs/                              Manual, assembly guide, BOM, images
  pdf/                               PDF versions of the manual and assembly guide

The .github/ folder holds the automation that builds the PDFs. You can ignore it.

Fabrication

BoardSizeLayersThicknessNotes
Main PCB30 x 100 mm21.6 mmStandard green is fine. Surface-mount parts on the back.
Faceplate30 x 128.5 mm11.6 mmAluminum PCB, white solder mask, black silkscreen. Only the front copper layer is used, so FR4 works too.

Sourcing your own parts

The BOM lists every part, including the surface-mount ones the kits ship with already soldered. The jack pads are oval so the board can also take panel-mount style jacks, which may be easier to source. The CUI MJ-3507 is one example: its sleeve is a solder lug rather than a pin, so each one needs a short wire from that lug to the jack's square pad.

License

This hardware design and its documentation are licensed under CC BY-NC-SA 4.0. See LICENSE.

The Schenktronics name and logo are trademarks of Schenktronics LLC and are not covered by the CC BY-NC-SA 4.0 license.

Links

Parts

73
QtyValueFootprintReferences
16100kResistor_SMD:R_0805_2012MetricR1, R2, R4, R5, R6, R7, R9, R10, R12, R13, R15, R16, R17, R18, R20, R21
131kResistor_SMD:R_0805_2012MetricR3, R8, R11, R14, R19, R22, R23, R24, R25, R26, R27, R28, R29
91N4148WS-7-FDiode_SMD:D_SOD-323D3, D4, D5, D6, D7, D8, D9, D10, D11
810pFCapacitor_SMD:C_0805_2012MetricC1, C2, C3, C7, C10, C11, C12, C13
8AudioJack2_SwitchT_NTSFootprints:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CenterHole_OvalPadsJ1, J2, J3, J4, J5, J6, J8, J9
4100k_NTSFootprints:Potentiometer_Alps_RK09L_Plated_Mount_HolesRV1, RV2, RV3, RV4
3100nFCapacitor_SMD:C_0805_2012MetricC4, C6, C9
3Fiducial_1mm_Mask2mmFiducial:Fiducial_1mm_Mask2mmFID1, FID2, FID3
210uFCapacitor_SMD:C_0805_2012MetricC5, C8
2DDiode_SMD:D_SMAD1, D2
2PolyfuseFuse:Fuse_1206_3216MetricF1, F2
1Conn_02x05_Odd_Even_NTSFootprints:PinHeader_2x05_P2.54mm_Vertical_ShroudedJ7
1LM4040D50IDBZRPackage_TO_SOT_SMD:SOT-23U2
1TL074HPackage_SO:SOIC-14_3.9x8.7mm_P1.27mmU1

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Questions

How big is the Attenuverter PCB?

It measures 30 × 100 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Attenuverter use?

73 parts, built around the TL074HID, LM4040D50IDBZR and 1N4148WS-7-F-CN. 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 Attenuverter KiCad files?

From the Schenktronics/ST03-attenuverter repository on GitHub, at the commit this page was made from: the board is hardware/attenuverter/Attenuverter.kicad_pcb and its schematic hardware/attenuverter/Attenuverter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Attenuverter design in my own project?

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