2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers28.1 × 11.2 mm
Acadapter
skot/acadapter2AC Infinity fan adapter board
- Size
- 28.1 × 11.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 17
- Pads
- 49
- Tracks, vias
- 47, 3
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 Mar 2026
- Updated
- 13 Mar 2026
Overview
Acadapter is an open-source printed circuit board by skot, from the skot/acadapter repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 28.1 × 11.2 mm with 11 parts on 17 nets, routed with 47 tracks and 3 vias.
Its parts include 4 resistors, 2 capacitors, 2 transistors, 2 connectors and 1 IC. It belongs with the interfaces and adapters boards of this library.
README
README.mdAC Infinity Fan Adapter
This project is a small KiCad adapter board for controlling an AC Infinity Cloudline fan from a controller fan header that provides an open-drain PWM output.
The current design is aimed at controllers such as Antminer and Bitaxe boards. The adapter translates the controller-side PWM signal into the Cloudline UIS PWM input without exposing the controller PWM node to the fan's internal 10 V pull-up.
Project files
acadapter.kicad_pro: KiCad project fileacadapter.kicad_sch: schematicacadapter.kicad_pcb: PCB layoutdoc/acinfinity-usbc.md: Cloudline connector pinout and interface notesdoc/render.png: PCB render
Design summary
The Cloudline fan uses a proprietary UIS connector on USB-C pins. Based on measurement so far:
- Cloudline PWM is pulled up internally to +10 V through about 10 kOhm
- direct connection to an unknown controller PWM output is not assumed safe
- the adapter uses the Cloudline +10 V rail to generate a local +5 V rail
- a two-transistor buffer recreates an open-drain PWM output for the fan side
The current design note and rationale are documented in doc/acinfinity-usbc.md.
Status
This is an in-progress hardware project. The PCB and interface notes are in the repository, but the design assumptions should still be validated against real hardware before treating the board as production-ready.
License
This project is licensed under the CERN Open Hardware Licence Version 2 - Strongly Reciprocal (CERN-OHL-S v2).
See the LICENSE file for the full license text.
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R3 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 2N3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 1 | 4.7k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | AP7380-50W5-7 | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | Conn_01x04 | acadapter:PinSocket_1x04_P2.54mm_Horizontal | J1 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J2 |
Questions
How big is the Acadapter PCB?
It measures 28.1 × 11.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Acadapter 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 Acadapter KiCad files?
From the skot/acadapter repository on GitHub, at the commit this page was made from: the board is acadapter.kicad_pcb and its schematic acadapter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Acadapter 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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