HardLabs

A1-4RD

mkol-ME·A1-4RD·hardware/cad/pcb/rev-e/Alfred.kicad_pcb

A1-4RD PCB layout, top view — open source board by mkol-ME

About the A1-4RD PCB

A1-4RD is an open source PCB design by mkol-ME, published on GitHub under the MIT license. It is a 4-layer board measuring 120 × 94 mm, with 93 components from 50 distinct parts.

Other key parts include the CYPD3177-24LQXQ, TPS259470LRPWR, TPS389001DSET, SN74LVC1G08DBVR and ICS-43434. By type, the board carries 39 resistors, 29 capacitors, 11 ICs, 4 connectors, 4 diodes and 3 transistors.

It belongs with the audio designs in this gallery.

From the project

Local voice assistant with a character: Whisper and a 26B LLM on a reflashed datacenter GPU, a custom voice, a 3D-printed body and a KiCad PCB

Native KiCad 10 project for Pi Zero 2 W, ICS-43434 microphone, MAX98357A amplifier and one FS90 servo. Revision E replaces D for the next prototype evaluation. Purchasing is deferred.

- R107: verified 32.0k 0.1% part, with recalculated supervisor thresholds. - R101: Pi/audio current limit lowered from about3.33A to2.02A nominal. - C101:10nF; slower Pi/audio startup reduces nominal reservoir charging surge from0.94A to0.44A. - External requirements now include the Pi, microSD, stencil/assembly and enclosure/linkage.

Main components on the A1-4RD

CYPD3177-24LQXQTPS259470LRPWRTPS389001DSETSN74LVC1G08DBVRICS-43434MAX98357AETE+TSN74LVC1G07DBVRTL431AIDBZRSN74LVC1G17DBVR74AUP1G74DC,125

A1-4RD bill of materials (BOM)

93 components, 50 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CYPD3177-24LQXQ
U1
2
TPS259470LRPWR
U2, U3
1
TPS389001DSET
U4
1
SN74LVC1G08DBVR
U5
1
ICS-43434
U6
1
MAX98357AETE+T
U7
1
SN74LVC1G07DBVR
U8
1
TL431AIDBZR
U9
1
SN74LVC1G17DBVR
U10
1
74AUP1G74DC,125
74AUP1G74DC
U11
2
SI4459BDY-T1-GE3
Si4459BDY
Q1, Q2
1
AO3401A
Q3
1
USB4105-GF-A
USB-C 5V/5A PD
J1
1
SSW-120-01-G-D
Pi Zero 2 W carrier socket
J2
1
282834-2
Speaker 4ohm 3W
J3
1
TSW-103-07-G-S
Jaw: GND +5V SIG
J4
1
B3F-1000
Momentary button
SW1
1
BZT52C10-7-F
10V gate zener
D1
1
SMAJ15A-13-F
15V transient suppressor
D2
1
WP710A10SGC
Green status LED
D3
Show 30 more
QtyPartRefs
1
MMSZ5V1T1G
5.1V EN clamp
D101
2
SRN6045TA-100M
10uH 3.2A
L1, L2
5
C0805C105K5RACTU
1u
C1, C2, C5, C6, C301
13
C0805C104K5RACTU
100n
C3, C4, C103, C104, C109, C110, C111, C112 +5
1
C0805C103J5GACTU
10n
C101
1
C0805C472J5GACTU
4.7n
C102
1
EEU-FR1A222L
2200u 10V
C105
1
EEU-FR1A102L
1000u 10V
C106
3
C1206C106K4RACTU
10u
C107, C108, C304
1
EEU-FR1A101
100u 10V
C305
1
C0805C224K5RACTU
220n
C306
2
C0805C102J5GACTU
1n
C307, C308
4
RC0805FR-071KL
1k 1%
R1, R305, R403, R409
7
RC0805FR-07100KL
100k 1%
R2, R110, R111, R303, R306, R401, R410
1
RC0805FR-0749K9L
49.9k 1%
R3
5
RC0805FR-0710KL
10k 1%
R4, R112, R113, R114, R115
1
RT0805BRD071K65L
1.65k 0.1%
R101
1
RT0805BRD073K32L
3.32k 0.1%
R102
2
RT0805BRD0734KL
34.0k 0.1%
R103, R105
4
RT0805BRD0710KL
10k 0.1%
R104, R106, R108, R405
1
RT0805BRD0732KL
32.0k 0.1%
R107
2
RC0805FR-072K2L
2.2k 1%
R109, R406
4
RC0805FR-0733RL
33 1%
R201, R202, R203, R302
1
RC0805FR-0747RL
47 1%
R301
1
RC0805FR-07100KL
100k 1%
R304
1
RC0805FR-074K7L
4.7k 1%
R402
1
RT0805BRD0712K4L
12.4k 0.1%
R404
1
RC0805FR-07100RL
100 1%
R407
1
SQP500JB-10R
10ohm 5W
R408
1
RC0805FR-07680RL
680 1%
R411

A1-4RD design files

The KiCad project lives in the mkol-ME/A1-4RD repository on GitHub; these links point at the commit this page was built from.

A1-4RD: common questions

How big is the A1-4RD PCB?

The A1-4RD measures 120 × 94 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the A1-4RD?

93 components, from 50 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 A1-4RD design files?

From the mkol-ME/A1-4RD 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 A1-4RD design in my own project?

Yes, under the terms of its MIT license, which mkol-ME chose for the repository.

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