HardLabs

LowerBoard1v2

hsetlik·PolySynth·LowerBoard1v2/LowerBoard1v2.kicad_pcb

LowerBoard1v2 PCB layout, top view — open source STM32 board by hsetlik

About the LowerBoard1v2 PCB

LowerBoard1v2 is an open source STM32 PCB design by hsetlik, published on GitHub. It is a 4-layer board measuring 310 × 110 mm, with 284 components from 64 distinct parts.

Its main chip is the STM32F411RET6, from the STM32 family. Other key parts include the TL074, DAC7578xPW, TMUX4051, TPS56528DDA and 74HC04. By type, the board carries 140 capacitors, 69 resistors, 37 ICs, 20 connectors, 8 diodes and 3 transistors.

It belongs with the audio designs in this gallery.

From the project

Analog polyphonic synth powered by STM32F4

Main components on the LowerBoard1v2

TL074DAC7578xPWTMUX4051STM32F411RET6TPS56528DDA74HC046N138L7805L7905TCA9548APWR74HC7474HC59574HC14

LowerBoard1v2 bill of materials (BOM)

284 components, 64 distinct parts.

QtyPartRefs
16
TL074
U201, U302, U303, U304, U305, U307, U309, U310 +8
1
DAC7578xPW
U301
7
TMUX4051
U306, U308, U313, U314, U321, U322, U323
1
STM32F411RET6
U401
1
TPS56528DDA
U402
1
74HC04
U404
1
6N138
U405
1
L7805
U501
1
L7905
U502
1
TCA9548APWR
U503
2
74HC74
U1001, U1003
2
74HC595
U1002, U1005
2
74HC14
U1006, U1007
2
2N7002H
Q401, Q402
1
BSH205G2A
Q403
1
16MHz
Y401
1
32.768kHZ
Y402
1
AUDIO_OUT
J201
1
Conn_01x02_Pin
J401
1
SWD Header
J403
Show 44 more
QtyPartRefs
1
MIDI_In
J404
1
Micro_SD_Card_Det2
J405
1
MIDI_Out
J406
1
MIDI_Thru
J407
1
POWER
J408
8
VoiceBoardConn_20P_200P
J501, J502, J503, J504, J505, J506, J507, J508
1
A_LOWER
J901
1
B_LOWER
J902
1
C_LOWER
J903
1
D_LOWER
J904
1
RST
SW401
1
BOOT
SW402
1
1N4148
D401
2
LED_RED
D402, D406
3
PMEG3030
D403, D404, D408
1
LED_GRN
D405
1
MMSZ5227C
D407
1
90R
FB401
1
21R
FB402
1
2.2uH
L401
65
100n
C201, C202, C302, C303, C304, C305, C306, C307 +57
5
1u
C203, C501, C502, C503, C504
2
4u7
C301, C410
57
470n
C317, C318, C319, C320, C321, C322, C323, C324 +49
4
6p
C401, C402, C403, C407
3
10u
C405, C418, C419
2
2u2
C413, C414
2
22u
C422, C423
18
100k
R201, R202, R203, R204, R205, R206, R208, R209 +10
4
47k
R207, R305, R413, R442
2
470
R212, R213
2
3k3
R301, R302
6
10k
R303, R304, R403, R404, R406, R502
2
27k
R308, R310
6
LOOP
R311, R427, R445, R446, R504, R1017
2
33R
R405, R438
3
680
R423, R428, R429
1
12k
R425
1
2k7
R426
6
220
R436, R437, R440, R441, R443, R444
1
4k7
R439
2
2k2
R501, R503
9
33R
RN401, RN402, RN403, RN404, RN405, RN701, RN702, RN703 +1
4
2k2
RN501, RN502, RN503, RN504

LowerBoard1v2 design files

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

LowerBoard1v2: common questions

What microcontroller does the LowerBoard1v2 use?

The LowerBoard1v2 is built around the STM32F411RET6, from the STM32 family.

How big is the LowerBoard1v2 PCB?

The LowerBoard1v2 measures 310 × 110 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the LowerBoard1v2?

284 components, from 64 distinct parts. The full bill of materials is listed on this page.

Where can I download the LowerBoard1v2 design files?

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

Can I use the LowerBoard1v2 design in my own project?

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

Can I test firmware for the LowerBoard1v2 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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