SomaExpander
About the SomaExpander PCB
SomaExpander is an open source PCB design by graysonarts, published on GitHub. It is a 2-layer board measuring 99.8 × 99.8 mm, with 20 components from 18 distinct parts.
Other key parts include the MCP23017_SP and ULN2801A. By type, the board carries 12 connectors, 4 ICs and 4 resistors.
It belongs with the audio designs in this gallery.
From the project
Society's Obedience through Managed Audio
Main components on the SomaExpander
SomaExpander bill of materials (BOM)
20 components, 18 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MCP23017_SP | DIP-28_W7.62mm | U1 |
| 1 | MCP23017_SP | DIP-28_W7.62mm | U2 |
| 2 | ULN2801A | SOIC-18W_7.5x11.6mm_P1.27mm | U3, U4 |
| 1 | Conn_01x04_Socket | JST_EH_S4B-EH_1x04_P2.50mm_Horizontal | J1 |
| 1 | ButtonPIN | Altech_AK100_1x16_P5.00mm | J2 |
| 1 | ButtonGND | Altech_AK100_1x16_P5.00mm | J3 |
| 1 | LEDS | Altech_AK100_1x16_P5.00mm | J4 |
| 1 | LEDS GND | Altech_AK100_1x16_P5.00mm | J5 |
| 1 | L-A2 | FanPinHeader_1x03_P2.54mm_Vertical | J6 |
| 1 | L-A1 | FanPinHeader_1x03_P2.54mm_Vertical | J7 |
| 1 | L-A0 | FanPinHeader_1x03_P2.54mm_Vertical | J8 |
| 1 | B-A2 | FanPinHeader_1x03_P2.54mm_Vertical | J9 |
| 1 | B-A1 | FanPinHeader_1x03_P2.54mm_Vertical | J10 |
| 1 | B-A0 | FanPinHeader_1x03_P2.54mm_Vertical | J11 |
| 1 | 12V IN | TerminalBlock_4Ucon_1x02_P3.50mm_Vertical | J12 |
| 1 | 4.7K | R_0201_0603Metric | R1 |
| 1 | 4.7K | R_0201_0603Metric | R2 |
| 2 | 440 | SOIC-16W_5.3x10.2mm_P1.27mm | RN1, RN2 |
SomaExpander design files
The KiCad project lives in the graysonarts/soma repository on GitHub; these links point at the commit this page was built from.
SomaExpander: common questions
How big is the SomaExpander PCB?
The SomaExpander measures 99.8 × 99.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the SomaExpander?
20 components, from 18 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the SomaExpander design files?
From the graysonarts/soma repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the SomaExpander design in my own project?
The repository has no license, so all rights stay with graysonarts. Use it as a reference, and ask the author before reusing the design.
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