HardLabs

LocketSound

Kreyl·LocketSound·SndLocket_hw/SndLocket.kicad_pcb

LocketSound PCB layout, top view — open source STM32 board by Kreyl

About the LocketSound PCB

LocketSound is an open source STM32 PCB design by Kreyl, published on GitHub. It is a 4-layer board measuring 53.2 × 138.8 mm, with 225 components from 73 distinct parts.

Its main chip is the STM32L476VET6, from the STM32 family. By type, the board carries 93 capacitors, 62 resistors, 9 transistors, 8 inductors, 5 switches and 4 test points.

LocketSound bill of materials (BOM)

225 components, 73 distinct parts.

QtyPartRefs
1
MOTOR_NO_CONTACTS
M1
5
IRLML6401
Q1, Q2, Q3, Q4, Q8
1
TEMT7000
Q5
1
TSOP4856
Q6
1
LED_RGB 5050
Q7
1
MMBT2222
Q9
1
ANT_GENERAL
ANT1
1
ANT_PCB_MONO_2PIN
ANT2
1
BAT
B1
1
BALUN868JOHANSON
BLN1
2
AP7331
DA1, DA4
1
TP4056
DA2
2
MCP1700
DA3, DA7
1
WM8960
DA5
1
OpAmp
DA6
1
STM32L476VET6
DD1
1
MFRC52202
DD2
1
CC256x
DD3
2
SN74LVC07
DD4, DD5
1
CC1101
DD6
Show 53 more
QtyPartRefs
1
LFB212G45SG8C341
FLT1
4
HOLE_METALLED
HOLE1, HOLE2, HOLE3, HOLE4
1
Microphone
MIC1
4
REFPOINT
RP1, RP2, RP3, RP4
1
SWITCH
SW1
1
DIPx8
SW2
3
BUTTON
SW3, SW4, SW5
4
TESTPOINT
TP1, TP2, TP9, TP10
1
CONN_4
XL1
1
USB_MICRO
XL2
1
CONN_6
XL3
1
CONN_MICROSD
XL4
1
AudioJackSimple
XL5
2
CONN_1
XL6, XL7
1
RJ12
XL8
1
CONN_2
XL9
1
12MHz
XTAL1
1
32768
XTAL2
1
27.12MHz
XTAL3
1
26MHz
XTAL4
1
27MHz
XTAL5
2
NSR0320
D1, D2
4
BLM15
L1, L2, L7, L8
2
560nH
L3, L4
1
BLM15AG102SN1
L5
1
*
L6
8
18pF
C1, C2, C27, C28, C29, C30, C34, C36
40
0.1u
C3, C6, C8, C9, C11, C12, C15, C19 +32
16
1u
C4, C13, C17, C18, C21, C23, C26, C31 +8
10
10u
C5, C14, C24, C35, C67, C70, C83, C85 +2
3
10n
C7, C10, C16
2
6.8pF
C20, C22
1
1nF
C32
2
220pF
C38, C39
6
*
C43, C44, C52, C53, C59, C60
1
22pF
C45
1
30pF
C71
2
*
C75, C78
1
100u
C84
17
10k
R1, R3, R5, R11, R21, R22, R25, R26 +9
10
100k
R2, R12, R13, R16, R17, R18, R41, R53 +2
16
1k
R4, R14, R23, R33, R35, R37, R39, R43 +8
1
150R
R6
1
1M
R7
1
0R2
R8
1
200k
R9
3
56k
R10, R24, R30
1
1.2k
R15
1
330k
R19
1
47k
R20
1
2.7k
R27
1
2k
R40
7
100R
R49, R50, R51, R55, R59, R60, R62

LocketSound design files

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

LocketSound: common questions

What microcontroller does the LocketSound use?

The LocketSound is built around the STM32L476VET6, from the STM32 family.

How big is the LocketSound PCB?

The LocketSound measures 53.2 × 138.8 mm, has 4 copper layers and is 1 mm thick.

How many components are on the LocketSound?

225 components, from 73 distinct parts. The full bill of materials is listed on this page.

Where can I download the LocketSound design files?

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

Can I use the LocketSound design in my own project?

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

Can I test firmware for the LocketSound 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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