

Code
- Size
- 116.8 × 162.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 23
- Pads
- 85
- Tracks, vias
- 242, 1
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 9 Dec 2011
- Updated
- 24 Aug 2026
Overview
LPAD is an open-source printed circuit board by Ehryk, from the Ehryk/ehryk.github.com repository on GitHub. It is a 2-layer board of 116.8 × 162.6 mm with 33 parts on 23 nets, routed with 242 tracks and 1 via.
Its parts include 13 switches, 6 capacitors, 4 resistors, 4 connectors and 3 inductors.
README
README.mdehryk.github.com
This is my github pages repo, viewable at ehryk.github.io. It also has some setup files that I sync between various computers, most notably git and bash aliases.
Github Pages (/, /js, /css, /img)
- xkcd 1288 Substitutions Bookmarklet
/linux && /git
These are the settings I sync between various computers. Update Config.bat for windows, update-config.sh for linux.
/rainmeter
Custom Rainmeter skins for GPU and CPU temps, etc.
/brian
Brian's Stuff. See more at Dr. Bird.org
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | #6 | Footprints:6-32UNC_Screw_Hole | S1, S2, S3, S4, S5, S6, S7 |
| 3 | Footprints:Thermal_Via_NoRing | , , | |
| 3 | Phase | Footprints:SW_DPDT_RED | SW2, SW4, SW6 |
| 2 | 2.2 μF | Footprints:C_AXIAL_15x24 | C2, C6 |
| 2 | Attenuation | Footprints:SW_DPDT_RED | SW1, SW3 |
| 1 | 0.25 mH | Footprints:ED110-2 | L3 |
| 1 | 0.38 mH | Footprints:ED110-2 | L1 |
| 1 | 0.78 mH | Footprints:ED110-2 | L2 |
| 1 | 10 μF | Footprints:C_AXIAL_25x36 | C3 |
| 1 | 24Ω | Footprints:R_WIREWOUND_100W | R4 |
| 1 | 25Ω | Footprints:R_WIREWOUND_25W | R2 |
| 1 | 2Ω | Footprints:R_WIREWOUND_25W | R1 |
| 1 | 2Ω | Footprints:R_WIREWOUND_100W | R3 |
| 1 | 3.3 μF | Footprints:C_AXIAL_15x36 | C1 |
| 1 | 5.6 μF | Footprints:C_AXIAL_19x36 | C4 |
| 1 | 8.2 μF | Footprints:C_AXIAL_23x36 | C5 |
| 1 | Bypass | Footprints:SW_SPDT_RED | SW5 |
| 1 | INPUT | Footprints:ED110-2 | P1 |
| 1 | TWEETER | Footprints:ED110-2 | P2 |
| 1 | WOOFER_A | Footprints:ED110-2 | P3 |
| 1 | WOOFER_B | Footprints:ED110-2 | P4 |
Questions
How big is the LPAD PCB?
It measures 116.8 × 162.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LPAD use?
33 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 LPAD KiCad files?
From the Ehryk/ehryk.github.com repository on GitHub, at the commit this page was made from: the board is Circuits/3rd Order Butterworth LPAD/LPAD.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the LPAD design in my own project?
Its repository states no licence, so its author keeps all rights: ask Ehryk before reusing the design.
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