2 layers20.5 × 24.8 mm
2 layers19.5 × 16 mm
PWM2STPCLK
RetroLoom/PWM2STPCLK1Vintage CPU throttle adapter.
- Size
- 19.5 × 16 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 8
- Nets
- 7
- Pads
- 17
- Tracks, vias
- 16, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 30 Jan 2025
- Updated
- 26 Feb 2025
Overview
PWM2STPCLK is an open-source printed circuit board by RetroLoom, from the RetroLoom/PWM2STPCLK repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 19.5 × 16 mm with 8 parts on 7 nets, routed with 16 tracks and 0 vias.
Its parts include 3 resistors, 3 connectors and 1 transistor.
README
README.mdPWM2STPCLK
Vintage CPU throttle adapter designed for use with interchangable PWM controllers.
This project is inspired from the ThrottleBlaster project from Scrap Computing.
https://github.com/scrapcomputing/ThrottleBlaster
The PWM2STPCLK can mount directly to an ATX motherboard stand-off for direct chassis grounding and securing. This allows placement of the STPCLK pin wiring to be close to CPU and guarded from strain. A standard PWM fan controller can be used for simplicity, but plans for developing dedicated controllers and adapting the ThrottleBlaster is on-going.
Build of Materials
https://github.com/RetroLoom/PWM2STPCLK/blob/master/KiCad/PWM2STPCLK.csv
Example PWM Controller - https://www.aliexpress.us/item/3256805787442361.html?spm=a2g0o.order_list.order_list_main.71.628f1802pm9FhH&gatewayAdapt=glo2usa
Example PWM Cables - https://www.aliexpress.us/item/3256805588566722.html?spm=a2g0o.order_list.order_list_main.77.628f1802pm9FhH&gatewayAdapt=glo2usa
Support the Developer
This project is brought to you free and open source, but it is not free to develop. If you like this project please consider supporting this and future developments.
Parts
8| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | STPCLK | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Horizontal | J2, J3 |
| 1 | 100 Ohms | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | MountingHole_3.2mm_M3_Pad | MountingHole:MountingHole_3.2mm_M3_Pad | H1 |
| 1 | PWM | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J1 |
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Questions
How big is the PWM2STPCLK PCB?
It measures 19.5 × 16 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PWM2STPCLK use?
8 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 PWM2STPCLK KiCad files?
From the RetroLoom/PWM2STPCLK repository on GitHub, at the commit this page was made from: the board is KiCad/PWM2STPCLK.kicad_pcb and its schematic KiCad/PWM2STPCLK.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PWM2STPCLK 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).