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Acorn electron expansion

ep-infosec·50_google_myelin-acorn-electron-hardware·expansion_minispartan_breakout/pcb/acorn-electron-expansion.kicad_pcb

Acorn electron expansion PCB layout, top view — open source board by ep-infosec

About the Acorn electron expansion PCB

Acorn electron expansion is an open source PCB design by ep-infosec, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 100 × 100 mm, with 21 components from 17 distinct parts.

Other key parts include the 74hct125d, C75561, 74LVC245 A0-7, 74LVC245 A8-15 and 74LVC245. By type, the board carries 7 resistors, 6 ICs, 5 capacitors and 3 connectors.

From the project

expansionminispartanbreakout ==============================

expansionminispartanbreakout ==============================

Superseded by cpusocketexpansion and cpusocketminispartandaughterboard._

This board breaks out the expansion connector to 0.1" holes, and provides the necessary level conversion and buffering to allow a Scarab miniSpartan6+ board to interface with the Electron's expansion connector.

I've assembled and tested one rev 1 board, with the miniSpartan6+ configured to provide a few ROM banks, and it works pretty nicely. I made some changes for rev 2 to allow switching the direction of the address buffers, which would make it possible to…

Acorn electron expansion, from the project README
From the project README

Main components on the Acorn electron expansion

74hct125dC7556174LVC245 A0-774LVC245 A8-1574LVC245scarab_mini_spartan_6_lx25

Acorn electron expansion bill of materials (BOM)

21 components, 17 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74hct125d
U1
1
C75561
74LVC245 D0-7
U2
1
74LVC245 A0-7
U3
1
74LVC245 A8-15
U4
1
74LVC245
U5
1
scarab_mini_spartan_6_lx25
U6
1
Acorn Electron Expansion Connector (fit connector underneath PCB)
P1
1
CONN_02X24
P2
1
5V / 5V0
P3
3
C28323
100n
C1, C2, C5
2
C49678
100n
C3, C4
1
C17414
10k
R1
1
C17513
10k
R2
1
C17630
10k
R3
2
C17673
10k
R4, R5
1
C17520
10k
R6
1
C17513
10k
R7

Acorn electron expansion design files

The KiCad project lives in the ep-infosec/50_google_myelin-acorn-electron-hardware repository on GitHub; these links point at the commit this page was built from.

Acorn electron expansion: common questions

How big is the Acorn electron expansion PCB?

The Acorn electron expansion measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Acorn electron expansion?

21 components, from 17 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 Acorn electron expansion design files?

From the ep-infosec/50_google_myelin-acorn-electron-hardware repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Acorn electron expansion design in my own project?

Yes, under the terms of its Apache-2.0 license, which ep-infosec chose for the repository.

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