HardLabs

GCM

JonathSpirit·GCM

GCM PCB layout, top view — open source board by JonathSpirit

About the GCM PCB

GCM is an open source PCB design by JonathSpirit, published on GitHub under the CERN-OHL-W-2.0 license. It is a 4-layer board measuring 203 × 116 mm, with 123 components from 33 distinct parts.

Other key parts include the LM810, LTC6994xS6-1, 74AHC1G32, 74AHC273 and 74AHC1G04. By type, the board carries 57 capacitors, 42 ICs, 13 connectors, 9 resistors and 1 crystal.

It belongs with the wearables and retro computing designs in this gallery.

From the project

G_CardMother a homemade without any microcontroller motherboard for 8bits processor like "GP8B"

Copyright (C) 2021 Guillaume Guillet\ Licensed under CERN-OHL-W v2 or later

- A max frequency of 50Mhz divisible by multiples of two (up to a division of 65536). For the processor and a seperated line for peripherals.

- 2 MM1 memory slot with address extension.

- Code execution from the memory slot 1 and switchable with the memory slot 2.

- Redirection of the writing buses (can be used as buffer).

GCM, from the project README
From the project README

Main components on the GCM

LM810LTC6994xS6-174AHC1G3274AHC27374AHC1G04CD74AC23874AHC13874AHC24474LVC1G74CD74AC161M74AHCT1G0474AHCT24474CBTLV16212SN74LV393ACD74AC151

GCM bill of materials (BOM)

123 components, 33 distinct parts.

QtyPartRefs
1
LM810
U1
1
LTC6994xS6-1
U2
3
74AHC1G32
U3, U25, U30
6
74AHC273
U4, U32, U40, U42, U43, U44
4
74AHC1G04
U5, U11, U18, U41
1
CD74AC238
U6
1
74AHC138
U7
3
74AHC244
U8, U9, U12
1
74LVC1G74
U10
6
CD74AC161M
U13, U14, U16, U17, U19, U20
1
74AHCT1G04
U15
1
74AHCT244
U21
3
74CBTLV16212
U22, U23, U24
4
SN74LV393A
U26, U27, U33, U34
6
CD74AC151
U28, U29, U31, U35, U36, U37
1
ECS-2200BX-500
X1
1
Molex_1053102116
J1
4
PP1_receptacle_TE_5-5530843-4
J2, J3, J4, J5
1
TE_Eurocard_96pole
J6
1
3-641124-6
J7
Show 13 more
QtyPartRefs
2
MM1_receptacle_5530843-2
J8, J11
1
Conn_01x02
J9
2
MM1_addressExtension
J10, J13
1
DEBUG_BUSES
J12
1
LOGO
GQR1
33
10nF
C1, C6, C7, C8, C12, C13, C16, C17 +25
4
1uF
C2, C51, C56, C57
20
100nF
C3, C4, C5, C9, C10, C11, C14, C15 +12
1
523k
R1
1
1M
R2
1
305k
R3
3
10k
R4, R5, R6
3
8x10k
RN1, RN2, RN3

GCM design files

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

GCM: common questions

How big is the GCM PCB?

The GCM measures 203 × 116 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the GCM?

123 components, from 33 distinct parts. The full bill of materials is listed on this page.

Where can I download the GCM design files?

From the JonathSpirit/GCM repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the GCM design in my own project?

Yes, under the terms of its CERN-OHL-W-2.0 license, which JonathSpirit chose for the repository.

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