2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers58 × 18 mm
Audio level shifter
mcqn/audio-level-shifterA simple analogue attenuator circuit to connect line-level audio to mic-level audio
- Size
- 58 × 18 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 9
- Pads
- 28
- Tracks, vias
- 34, 2
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Aug 2024
- Updated
- 8 Aug 2025
Overview
Audio level shifter is an open-source printed circuit board by mcqn, from the mcqn/audio-level-shifter repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 58 × 18 mm with 11 parts on 9 nets, routed with 34 tracks and 2 vias.
Its parts include 2 capacitors and 2 connectors. It belongs with the audio and music and interfaces and adapters boards of this library.
README
README.mdaudio-level-shifter
A simple analogue attenuator circuit to connect line-level audio to mic-level audio.
The Rode Wireless GO is a nice wireless microphone. We've also been using it, in combination with the audio-level-shifter board to act as a wireless relay for a remote speaker.
Aux out -> audio-level-shifter -> mic input on the Wireless GO transmitter -> Wireless GO receiver -> Aux in on speaker
We've been using this setup to run a second speaker on our group bike rides. The key to getting reliable audio relay across a group of cyclists is to get the radio setup up above everyone's heads. For that we've been repurposing action camera accessories—mostly clamps and selfie sticks. To make it easier to securely mount everything we've designed some 3D-printed sleeves for the Wireless GO with GoPro-compatible fastenings.
Files
- audio-level-shifter/ - Kicad design files for the PCB
- audio-level-shifter-electronics.FCStd - FreeCAD project to wrap the STEP 3D design file generated by Kicad for the electronics
- assembled-audio-level-shifter.FCStd - FreeCAD project (needs v1.0 or later) for the case design
- extras/ - FreeCAD project and output STL file for the Wireless GO sleeve
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H1, H2, H3, H4 |
| 2 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2 |
| 1 | IN | project_libraries:CUI_SJ2-35813B-SMT-TR | J1 |
| 1 | OUT | project_libraries:CUI_SJ2-35813B-SMT-TR | J2 |
| 1 | R_Potentiometer_Dual | Potentiometer_THT:Potentiometer_Alps_RK09L_Double_Horizontal | RV1 |
The 9 most common of 11 parts.
Questions
How big is the Audio level shifter PCB?
It measures 58 × 18 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Audio level shifter use?
11 parts. 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 Audio level shifter KiCad files?
From the mcqn/audio-level-shifter repository on GitHub, at the commit this page was made from: the board is audio-level-shifter/audio-level-shifter.kicad_pcb and its schematic audio-level-shifter/audio-level-shifter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Audio level shifter design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 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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