Econet standalone

google·myelin-acorn-electron-hardware·econet_from_scratch/pcb/econet_standalone.kicad_pcb

Econet standalone PCB layout, top view — open source board by google

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About the Econet standalone PCB

Econet standalone is an open source PCB design by google, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 48.5 × 48 mm, with 67 components from 30 distinct parts.

Other key parts include the Econet, C75561, LM319, XC9572XL and MCP1700T-3302E/MB. By type, the board carries 19 resistors, 12 capacitors, 5 ICs and 1 jumper.

It belongs with the retro computing designs in this gallery.

From the project

Phillip Pearson's retro hardware projects for the Acorn Electron

Can we implement an Econet interface from scratch, without having to use a BBC Master Econet module or MC68B54 chip?

I've built one of these, and am working on the RTL and firmware.

This board will allow a computer with a USB port to communicate on an Econet network. A CPLD handles the wire protocol and a microcontroller handles framing and communicating with the attached computer.

Econet standalone, from the project README — From the project README

Main components on the Econet standalone

Econet C75561 LM319 XC9572XL MCP1700T-3302E/MB

Econet standalone bill of materials (BOM)

67 components, 30 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	Econet	din_5_econet_pcb_mount	U1
1	C75561 SN65C1168	SOIC-16W_5.3x10.2mm_Pitch1.27mm	U2
1	LM319	SOIC-14_3.9x8.7mm_Pitch1.27mm	U3
1	XC9572XL	xilinx_vqg44	U4
1	MCP1700T-3302E/MB	SOT-89-3	U5
1	USB power	Pin_Header_Straight_1x02_Pitch2.54mm	JP1
30	—	via_single	staple_single1, staple_single2, staple_single3, staple_single4, staple_single5, staple_single6, staple_single7, staple_single8 +22
1	C28323 10u	R_0805_HandSoldering	C1
1	C28323 100n	C_0805_HandSoldering	C2
4	C49678 100n	C_0805_HandSoldering	C3, C8, C10, C11
2	C49678 1u	C_0805_HandSoldering	C4, C12
1	C28323 1u	C_0805_HandSoldering	C5
1	10n	C_0805_HandSoldering	C6
1	100n	C_0805_HandSoldering	C7
1	C49678 10u	C_0805_HandSoldering	C9
1	C17414 1k5	R_0805_HandSoldering	R1
1	C17513 1k	R_0805_HandSoldering	R2
1	C17630 100k	R_0805_HandSoldering	R3
1	C17673 100k	R_0805_HandSoldering	R4
1	C17673 10k	R_0805_HandSoldering	R5

Show 10 more

Qty	Part	Footprint	Refs
1	C17520 10k	R_0805_HandSoldering	R6
2	C17513 56k	R_0805_HandSoldering	R7, R8
2	C17414 56k	R_0805_HandSoldering	R9, R10
1	C17414 1M5	R_0805_HandSoldering	R11
2	1k	R_0805_HandSoldering	R12, R19
1	C17630 1k	R_0805_HandSoldering	R13
1	C17513 220R	R_0805_HandSoldering	R14
1	C17802 1k	R_0805_HandSoldering	R15
2	C17802 56R	R_0805_HandSoldering	R16, R17
1	10k	R_0805_HandSoldering	R18

Econet standalone design files

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

Econet standalone: common questions

How big is the Econet standalone PCB?

The Econet standalone measures 48.5 × 48 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Econet standalone?

67 components, from 30 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 Econet standalone design files?

From the 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 Econet standalone design in my own project?

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

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