HardLabs

Q2

joewing·q2·hardware/q2/pcb/q2/q2.kicad_pcb

Q2 PCB layout, top view — open source Raspberry Pi board by joewing

About the Q2 PCB

Q2 is an open source Raspberry Pi PCB design by joewing, published on GitHub. It is a 2-layer board measuring 198 × 278 mm, with 1653 components from 26 distinct parts.

Its main chip is the C9138, from the Raspberry Pi family. Other key parts include the LY6264SL-70LLI and CAT809JTBI-GT3. By type, the board carries 1016 transistors, 463 resistors, 96 diodes, 44 capacitors, 23 switches and 3 ICs.

From the project

12-bit single-board discrete transistor computer

Hardware for the Q2 12-bit bit-serial single-board discrete transistor computer.

The Q2 is a dual-layer PCB about the size of a sheet of paper allowing it to be fabricated just about anywhere. For assembly, the BOM is stored with the schematic to reference the necessary surface-mount components. Due to the large number of components, I use a turn-key assembly service. Although numerous, all of the components are fairly standard making them cheap and widely available.

Q2, from the project README
From the project README

Main components on the Q2

LY6264SL-70LLICAT809JTBI-GT3

Q2 bill of materials (BOM)

1653 components, 26 distinct parts.

QtyPartRefs
2
LY6264SL-70LLI
6264
Lyontek Inc.
U1, U2
1
CAT809JTBI-GT3
CAT809J
onsemi
U3
940
2N7002
Guangdong Hottech
Q1, Q3, Q4, Q5, Q6, Q7, Q8, Q9 +932
76
2N7002K
Guangdong Hottech
Q2, Q44, Q46, Q47, Q48, Q72, Q114, Q116 +68
1
C9138
Programmer
BOOMELE(Boom Precision Elec)
J1
1
USB_B
J2
1
I2C
J3
1
Battery
BT1
1
WC1602A
DS1
2
3386P-1-103LF
10k
BOURNS
RV1, RV3
13
TA-3524S-A2
Switch
Yuandi
SW1, SW7, SW8, SW9, SW10, SW11, SW12, SW13 +5
10
UK-B0228-G5-160-JZ
Button
USAKRO
SW2, SW3, SW4, SW5, SW6, SW19, SW20, SW21 +2
1
CLK
TP1
75
17-21SUYC/TR8
Yellow
Hubei KENTO Elec
D1, D2, D3, D4, D5, D6, D7, D8 +67
21
BAT43W
Changjiang Electronics Tech (CJ)
D38, D39, D40, D41, D42, D43, D44, D45 +13
33
CC0805KRX7R9BB104
0.1u
YAGEO
C1, C2, C3, C4, C5, C6, C7, C8 +25
8
CL21B105KBFNNNE
1u
Samsung Electro-Mechanics
C10, C14, C18, C19, C20, C21, C26, C29
2
0805B471K500NT
470p
FH
C11, C24
1
CL21A106KAYNNNE
10u
Samsung Electro-Mechanics
C27
244
0603WAF1002T5E
10k
UNI-ROYAL(Uniroyal Elec)
R1, R2, R4, R6, R9, R10, R11, R12 +236
Show 6 more
QtyPartRefs
31
0603WAF1003T5E
100k
UNI-ROYAL(Uniroyal Elec)
R3, R18, R33, R48, R63, R78, R93, R108 +23
48
0603WAF6801T5E
6.8k
UNI-ROYAL(Uniroyal Elec)
R5, R13, R20, R26, R35, R43, R50, R56 +40
48
0603WAF2202T5E
22k
UNI-ROYAL(Uniroyal Elec)
R7, R15, R22, R28, R37, R45, R52, R58 +40
81
0603WAF1001T5E
1k
UNI-ROYAL(Uniroyal Elec)
R8, R16, R23, R29, R38, R46, R53, R59 +73
1
1206W4F1000T5E
100
UNI-ROYAL(Uniroyal Elec)
R274
10
0603WAF4701T5E
4.7k
UNI-ROYAL(Uniroyal Elec)
R275, R276, R277, R301, R302, R305, R306, R308 +2

Q2 design files

The KiCad project lives in the joewing/q2 repository on GitHub; these links point at the commit this page was built from.

Q2: common questions

What microcontroller does the Q2 use?

The Q2 is built around the C9138, from the Raspberry Pi family.

How big is the Q2 PCB?

The Q2 measures 198 × 278 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Q2?

1653 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Q2 design files?

From the joewing/q2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Q2 design in my own project?

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

Can I test firmware for the Q2 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.

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