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C-Audio-BHOA

Stustup·C-Audio-BHOA·Hardware/KiCAD/BHOA/BHOA.kicad_pcb

C-Audio-BHOA PCB layout, top view — open source board by Stustup

About the C-Audio-BHOA PCB

C-Audio-BHOA is an open source PCB design by Stustup, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 100 × 100 mm, with 143 components from 25 distinct parts.

Other key parts include the OPA1688 and LME49724. By type, the board carries 56 capacitors, 54 resistors, 20 ICs, 11 connectors and 2 diodes.

It belongs with the audio designs in this gallery.

From the project

A fully balanced headphone amp from paralleling multiple opamps. With inspiration from the Schiit Magni Heresy

A high powered differential headphone amp with a focus on modularity and prototyping. Inspired by the Schiit Audio Magni Heresy.

- All sections of the amp should be modular (Filter, VA, CA, Output protection) - All sections should be accessable via pin headers - Output power >1W per channel

The Amp consists of a simple differential input filter for very high frequency noise, an instrumential amplifier input stage for differential voltage amplification and 8 paralelled opamp sections in buffer topology per channel (of which there are 4 for differential amplification for a total of 16…

C-Audio-BHOA, from the project README
From the project README

Main components on the C-Audio-BHOA

OPA1688LME49724

C-Audio-BHOA bill of materials (BOM)

143 components, 25 distinct parts.

QtyPartRefs
18
OPA1688
U100, U101, U102, U103, U200, U201, U202, U203 +10
2
LME49724
U602, U702
1
Bal Input
J1
1
Prestage SW R
J2
1
PWR
J4
1
Prestage SW L
J5
1
Output Stage Out
J6
1
~
J7
2
SW Conn
J8, J9
1
Input SW L
J10
1
UnBal Input
J11
1
Input SW R
J12
2
Grn
D400, D401
4
220u
C7, C9, C10, C11
6
100p
C16, C17, C801, C803, C901, C903
36
100n
C100, C101, C102, C103, C104, C105, C106, C107 +28
4
220p
C601, C606, C701, C706
4
10u
C602, C605, C702, C705
2
4n7
C802, C902
2
1k
R19, R20
Show 5 more
QtyPartRefs
32
1R
R100, R101, R102, R103, R104, R105, R106, R107 +24
6
4k7
R408, R409, R602, R607, R702, R707
8
2k49
R601, R603, R605, R606, R701, R703, R705, R706
2
4k7
R604, R704
4
200R
R801, R802, R901, R902

C-Audio-BHOA design files

The KiCad project lives in the Stustup/C-Audio-BHOA repository on GitHub; these links point at the commit this page was built from.

C-Audio-BHOA: common questions

How big is the C-Audio-BHOA PCB?

The C-Audio-BHOA measures 100 × 100 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the C-Audio-BHOA?

143 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the C-Audio-BHOA design files?

From the Stustup/C-Audio-BHOA repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the C-Audio-BHOA design in my own project?

Yes, under the terms of its GPL-3.0 license, which Stustup chose for the repository.

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