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Expander

plinkysynth·plinky-expander

Expander PCB layout, top view — open source board by plinkysynth
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About the Expander PCB

Expander is an open source PCB design by plinkysynth, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 43.2 × 128.3 mm, with 68 components from 22 distinct parts.

Other key parts include the LM4040DBZ-2.5, SN74LVC1G17DBV, HCPL-0631, DAC7554IDGS and TL072. By type, the board carries 29 resistors, 12 capacitors, 11 connectors, 8 ICs and 8 diodes.

It belongs with the audio designs in this gallery.

From the project

hardware design of a small expander for the plinky synth

if you want to get some of these made, I recommend the gerbers in the folders gerbersjustfront (the front panels, no SMT assembly required) and gerbersjustback (one sided SMT assembly required, JLCPCB compatible subject to stock) the BOM files for the SMT assembly are in the main folder, and then the hardware BOM file is the set of thruhole parts you will need to order to assemble. in summary: - get black PCB only boards using the gerber zip file in gerbersjustfront - get any-color PCB boards with SMT assembly using gerber zip and placement file in gerbersjustback, and using the BOM in…

Main components on the Expander

LM4040DBZ-2.5SN74LVC1G17DBVHCPL-0631DAC7554IDGSTL072

Expander bill of materials (BOM)

68 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LM4040DBZ-2.5
U1
1
SN74LVC1G17DBV
U2
1
HCPL-0631
U3
1
DAC7554IDGS
U4
4
TL072
U5, U6, U7, U8
1
Conn_02x08_Odd_Even
J1
2
AudioJack2_SwitchT
J2, J3
1
Conn_02x05_Odd_Even
J4
4
AudioJack3
J5, J6, J7, J8
1
USB_B_noshield
J9
1
Conn_02x04_Odd_Even
J10
1
Conn_02x04_Odd_Even
J11
4
WHITE
D1, D3, D5, D7
4
BLUE
D2, D4, D6, D8
8
100n
C1, C3, C4, C5, C6, C7, C8, C9
4
10n
C10, C11, C12, C13
1
3k
R1
9
220R
R2, R3, R6, R9, R21, R22, R23, R24 +1
9
10k
R4, R13, R14, R15, R16, R25, R26, R27 +1
1
7.5k
R5
Show 2 more
QtyPartRefs
5
10R
R7, R8, R10, R11, R12
4
56k
R17, R18, R19, R20

Expander design files

The KiCad project lives in the plinkysynth/plinky-expander repository on GitHub; these links point at the commit this page was built from.

Expander: common questions

How big is the Expander PCB?

The Expander measures 43.2 × 128.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Expander?

68 components, from 22 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 Expander design files?

From the plinkysynth/plinky-expander repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Expander design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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