HardLabs

ALU

DutchMaker·TTL-computer·Circuits/KiCad/ALU/ALU.kicad_pcb

ALU PCB layout, top view — open source board by DutchMaker
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About the ALU PCB

ALU is an open source PCB design by DutchMaker, published on GitHub. It is a 2-layer board measuring 132.1 × 86.4 mm, with 30 components from 16 distinct parts.

Other key parts include the 74x377, 74x04, 74x181, 74x245 and 74x08. By type, the board carries 12 ICs, 8 resistors, 5 diodes and 2 connectors.

From the project

Building a computer from scratch using 74xx logic chips

- Add ./Libraries/74xx-Computer-Symbols.lib as global Symbol library to KiCad (Eeschema) - Add ./Libraries as global Footprint library to KiCad (Pcbnew) - PCBs are initially autorouted using ./Libraries/freeRouting.jar and traces are enhanced manually

There are a number of deviations and errors that were found in schematic/PCB designs after PCB production. They are listed here if they were not fixed in the schematic/PCB design files.

Main components on the ALU

74x37774x0474x18174x24574x0874x3274x27

ALU bill of materials (BOM)

30 components, 16 distinct parts.

QtyPartRefs
2
74x377
U1, U2
1
74x04
U3
2
74x181
U4, U5
2
74x245
U6, U12
2
74x08
U7, U10
1
74x32
U8
2
74x27
U9, U11
2
Conn_01x13_Male
J1, J2
3
HDSP-4830_2
BAR1, BAR2, BAR3
1
Flt
D1
1
Feq
D2
1
Fgt
D3
1
Fc
D4
1
Fz
D5
5
470
R1, R2, R3, R4, R5
3
470
RN1, RN2, RN3

ALU design files

The KiCad project lives in the DutchMaker/TTL-computer repository on GitHub; these links point at the commit this page was built from.

ALU: common questions

How big is the ALU PCB?

The ALU measures 132.1 × 86.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ALU?

30 components, from 16 distinct parts. The full bill of materials is listed on this page.

Where can I download the ALU design files?

From the DutchMaker/TTL-computer repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the ALU design in my own project?

The repository has no license, so all rights stay with DutchMaker. Use it as a reference, and ask the author before reusing the design.

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