HardLabs

Dac

sambazley·dac·pcb/project.kicad_pcb

Dac PCB layout, top view — open source STM32 board by sambazley

About the Dac PCB

Dac is an open source STM32 PCB design by sambazley, published on GitHub. It is a 2-layer board measuring 100 × 64.9 mm, with 86 components from 36 distinct parts.

Its main chip is the STM32F042F4Px, from the STM32 family. Other key parts include the AP7335, CS4350, LTC1983, LM4562 and PLR135. By type, the board carries 28 capacitors, 23 resistors, 10 ICs, 4 connectors, 3 transistors and 3 switches.

It belongs with the audio designs in this gallery.

From the project

STM32 USB headphone DAC

Dac, from the project README
From the project README

Main components on the Dac

AP7335CS4350LTC1983LM4562PLR135DIR9001‎SN74LVC157ADR‎STM32F042F4Px

Dac bill of materials (BOM)

86 components, 36 distinct parts.

QtyPartRefs
1
AP7335
U1
1
CS4350
U2
2
LTC1983
U3, U4
2
LM4562
U5, U6
1
PLR135
U7
1
DIR9001
U8
1
‎SN74LVC157ADR‎
U9
1
STM32F042F4Px
U10
3
MMBTA06
Q1, Q2, Q3
1
AudioJack3
J1
1
USB_B
J2
2
Conn_01x03
J3, J4
1
3u3
E1
8
10u
E2, E3, E4, E5, E6, E7, E8, E9
1
EC2-4.5NU
K1
1
R_POT_Dual 10k
RV1
2
SW_SPDT
SW1, SW2
1
SW_Push
SW3
2
LED
D1, D2
1
D
D3
Show 16 more
QtyPartRefs
1
47u
L1
5
1u
C1, C4, C7, C10, C22
8
100n
C2, C3, C6, C8, C15, C23, C25, C26
5
10u
C5, C9, C11, C12, C13
6
1n
C14, C16, C17, C18, C19, C20
1
4u7
C21
1
10n
C24
1
4n7
C27
1
68n
C28
1
15k
R1
2
4k7
R2, R21
11
1k
R3, R4, R6, R9, R10, R11, R12, R13 +3
4
10k
R5, R19, R20, R22
2
100k
R7, R8
2
68
R17, R18
1
680
R23

Dac design files

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

Dac: common questions

What microcontroller does the Dac use?

The Dac is built around the STM32F042F4Px, from the STM32 family.

How big is the Dac PCB?

The Dac measures 100 × 64.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Dac?

86 components, from 36 distinct parts. The full bill of materials is listed on this page.

Where can I download the Dac design files?

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

Can I use the Dac design in my own project?

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

Can I test firmware for the Dac 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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