HardLabs

PBITzBackplaneMezzanine

dumaiss·pBITzPlatform·pBITzBackplaneMezzanine/pBITzBackplaneMezzanine.kicad_pcb

PBITzBackplaneMezzanine PCB layout, top view — open source board by dumaiss
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About the PBITzBackplaneMezzanine PCB

PBITzBackplaneMezzanine is an open source PCB design by dumaiss, published on GitHub under the SHL-2.1 license. It is a 4-layer board measuring 99.9 × 80.4 mm, with 38 components from 20 distinct parts.

Other key parts include the FE1.1S-BSOP28BCN, MAX3421EETJ+T and CD74HC4050M96. By type, the board carries 16 capacitors, 7 resistors, 5 connectors, 4 ICs, 4 fuses and 2 crystals.

It belongs with the retro computing designs in this gallery.

From the project

Code, documentation and schematics for the pBITz backplane and associated assets

pBITz is the shared hardware platform used by the Coffee Series of homebrew computers. It provides the common physical and electrical foundation — backplane, power control, service interfaces, reusable KiCad assets, test hardware, and platform tools — while leaving the personality of each machine to its CPU board and machine-specific peripherals.

The goal is not to define one rigid computer architecture. Instead, pBITz provides a practical common platform on which very different machines can be built: 8-bit, 16-bit, and eventually wider systems can share the same mechanical infrastructure…

Main components on the PBITzBackplaneMezzanine

FE1.1S-BSOP28BCNMAX3421EETJ+TCD74HC4050M96

PBITzBackplaneMezzanine bill of materials (BOM)

38 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
FE1.1S-BSOP28BCN
U1
1
MAX3421EETJ+T
MAX3421EETJ_T
U2
2
CD74HC4050M96
U3, U4
2
ABL-12.000MHZ-B2
Y1, Y2
1
0484060001
USB3_A_Stacked
J1
2
732-5301-ND
Conn_01x04
J2, J3
1
10067847-001RLF
J4
1
SBH11-PBPC-D10-ST-BK
Conn_02x10_Odd_Even
J5
4
1206L050YR
F1, F2, F3, F4
1
C0603C105K4RACTU
1u
C1
4
C0603C104K5RACTU
100n
C2, C3, C14, C15
2
CL10X106MO8NRNC
10u
C4, C8
4
ECA-1CHG101I
100u
C5, C11, C12, C13
2
22P
22p
C6, C7
2
KGM15ACG1C220KT
22p
C9, C10
1
CL10X106MO8NRNC
1u
C16
2
RMCF0603FT100K
100k
R1, R2
1
RC0603JR-072K7L
2k7
R3
2
RC0603FR-0733RL
33
R4, R5
2
RC0603FR-0710KL
10k
R6, R7

PBITzBackplaneMezzanine design files

The KiCad project lives in the dumaiss/pBITzPlatform repository on GitHub; these links point at the commit this page was built from.

PBITzBackplaneMezzanine: common questions

How big is the PBITzBackplaneMezzanine PCB?

The PBITzBackplaneMezzanine measures 99.9 × 80.4 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the PBITzBackplaneMezzanine?

38 components, from 20 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 PBITzBackplaneMezzanine design files?

From the dumaiss/pBITzPlatform 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 PBITzBackplaneMezzanine design in my own project?

It is published under SHL-2.1, which limits how it may be reused; read the license before building on it.

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