HardLabs

Pdmbrd

jaycordaro·pdmbrd

Pdmbrd PCB layout, top view — open source board by jaycordaro
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About the Pdmbrd PCB

Pdmbrd is an open source PCB design by jaycordaro, published on GitHub under the TAPR-OHL-1.0 license. It is a 4-layer board measuring 35.2 × 52 mm, with 43 components from 32 distinct parts.

Other key parts include the LT3042XMSE and FAN3852. By type, the board carries 16 connectors, 9 capacitors, 9 resistors, 3 ICs, 3 test points and 2 inductors.

It belongs with the audio designs in this gallery.

From the project

Analog audio to Pulse Density Modulation (PDM) using OnSemi FAN3852 ICs

Converts analog audio and ultrasound signals into digital Pulse Density Modulation (PDM) format Jumper selection for different options Accepts analog input signals from SMA connectors, jumper wire, or 3.5mm (1/8") stereo jack On-board low noise LT3042 voltage regulator (U1) powered from USB Micro provides 3.3V or 1.8V to the ADCs

Board can be (mostly) assembled by JLCPCB (only U2 and UJ3 FAN3852 and J16 CUI SJ-3523-SMT audio jack need hand soldering) Much cheaper than OnSemi FAN3852 EVB

Pdmbrd, from the project README
From the project README

Main components on the Pdmbrd

LT3042XMSEFAN3852

Pdmbrd bill of materials (BOM)

43 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LT3042XMSE
LT3042xMSE
U1
2
FAN3852
U2, U3
1
C5116481
V_SET_JMP
J1
1
C505111
USB_B_Micro
J2
1
C530661
CLOCK_SMA
J3
1
C530661
PDAT_SMA
J4
1
C5116481
PDAT_SMA_JMP
J5
1
C5116481
PDAT_L_JMP
J6
1
C5116481
PDAT_R_JMP
J7
1
C5116481
CLK_JMP_L
J8
1
C5116481
CLK_JMP_R
J9
1
C5116481
LEFT_BIAS_JMP
J10
1
C5116481
RIGHT_BIAS_JMP
J11
1
C2894926
RT_IN_SEL
J12
1
C2894926
LEFT_IN_SEL
J13
1
C530661
RIGHT_SMA
J14
1
C530661
LEFT_SMA
J15
1
AUDIOJACK3
AudioJack3
J16
1
C238123
V_IN
TP1
1
C238122
GND
TP2
Show 12 more
QtyPartRefs
1
C238124
VDDA
TP3
1
C434423
ON
D1
2
C19330
FerriteBead
FB1, FB2
3
4.7U
4.7u
C1, C2, C3
1
0.1U
0.1u
C4
3
4.7U
0.1u
C5, C8, C9
2
1n
C6, C7
1
15K
1.5k
R1
1
18K
1.78k
R2
1
1k
R3
2
33
R4, R5
4
0.1U
2.2k
R6, R7, R8, R9

Pdmbrd design files

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

Pdmbrd: common questions

How big is the Pdmbrd PCB?

The Pdmbrd measures 35.2 × 52 mm, has 4 copper layers and is 4.69 mm thick.

How many components are on the Pdmbrd?

43 components, from 32 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 Pdmbrd design files?

From the jaycordaro/pdmbrd 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 Pdmbrd design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which jaycordaro chose for the repository.

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