2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers75 × 33.5 mm
Low pass filter board
- Size
- 75 × 33.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 6
- Pads
- 50
- Tracks, vias
- 14, 61
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 26 Jun 2025
- Updated
- 8 Jul 2025
Overview
LPF is an open-source printed circuit board by SatcomRadio, from the SatcomRadio/LPF repository on GitHub, published under the MIT licence. It is a 2-layer board of 75 × 33.5 mm with 11 parts on 6 nets, routed with 14 tracks and 61 vias.
Its parts include 4 inductors and 3 capacitors.
README
README.mdLow pass filter board
This repo consists of a board for making a low pass filter (LPF).
You can use it with your own coils and RF capacitors for your desired frequency.
You can use a metal box like this one of size 92x38x31mm to store it.
In order to make it work on satcom frequencies you will need:
3x 11pF RF capacitors (https://aliexpress.com/item/1005006664008969.html)
0.8mm enameled copper wire
Optional: Storage box (https://www.aliexpress.com/item/1005001849603652.html)Schema:
Side coils instructions:
0.8mm enameled wire, 3.5mm diameter, 2 turns spreadedMiddle coils instructions:
0.8mm enameled wire, 4mm diameter, 5 turns spreadedAfter adjusting with the nanovna you should be able to get this graph:
Ordering the PCB:
Download the Gerber file from this repo and order it a jlcpcb with the default options.
The only option I've changed is to remove the manufacture code mark
Please make sure to visit the satcom radio website for more information
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | 11p | Footprints:RFCap_S | C1, C2, C3 |
| 1 | 23n | Footprints:Wound_Inductor_S | L4 |
| 1 | 26n | Footprints:Wound_Inductor_S | L1 |
| 1 | 56n | Footprints:Wound_Inductor_S | L3 |
| 1 | 58n | Footprints:Wound_Inductor_S | L2 |
Questions
How big is the LPF PCB?
It measures 75 × 33.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LPF 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 LPF KiCad files?
From the SatcomRadio/LPF repository on GitHub, at the commit this page was made from: the board is kicad/LPF.kicad_pcb and its schematic kicad/LPF.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LPF design in my own project?
Its repository publishes it under the MIT 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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