4 layers70 × 76 mm Balanced receiver, the printed circuit board in 3D

Balanced receiver

Balanced Audio Receiver

Size: 70 × 76 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 139
Nets: 84
Pads: 395
Tracks, vias: 794, 117
Pours: 10
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 1 Feb 2025
Updated: 4 May 2025

Overview

Balanced receiver is an open-source printed circuit board by brbcza, from the brbcza/balanced-receiver repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 70 × 76 mm with 139 parts on 84 nets, routed with 794 tracks and 117 vias.

It is built around the TPS5430DDA, 24LC256-I/P and LM1117DT-3.3, with the B340A among its other parts. Its parts include 60 capacitors, 42 resistors, 11 connectors, 8 ICs and 4 diodes. It belongs with the audio and music boards of this library.

Main components

README

README.md

Balanced Audio Receiver

The Balanced Audio Receiver is a versatile, compact PCB (Printed Circuit Board) designed for DIY audio enthusiasts, particularly for use as an input stage in custom speaker projects. The design integrates a balanced XLR 3-pin input and includes an onboard 5V buck converter to provide power for additional components, making it a comprehensive solution for audio applications that require both signal processing and power management.

This board is ideal for anyone looking to build high-quality audio systems, such as home audio setups or custom speaker projects, with a focus on clean, balanced audio signal processing.

[!NOTE]
The latest production files for the Balanced Audio Receiver can be downloaded from the latest release.
The Interactive BOM is also available in the latest release for easier component sourcing.

PCB image

Key Futures

The Balanced Audio Receiver board incorporates several essential features to ensure high performance and flexibility:

Fully balanced XLR input
Diferencial THAT1240 amplifier to process incoming audio signal
Integrated 5V buck converter to power onboard ICs and additional external electronics
Integraded charge pump to generate -5V to power signal amplifier
Optional 5V output to power external FAN

Board Design and Component Sourcing

The Balanced Audio Receiver PCB is designed to be as modular and flexible as possible. It is intended for use in various custom audio systems where space, signal integrity, and power efficiency are important considerations. The generated Bill of Materials from latest release will help to guide you in sourcing the components for assembly.

Interactive BOM
The interactive BOM can be found at the following link: Interactive BOM.

Contributing

I welcome any contributions to the project. If you have suggestions for improvements, bug fixes, or want to add new features, feel free to submit pull requests or open issues.

License

The Balanced Audio Receiver is open-source hardware, licensed under the GPLv3 License. Feel free to modify and adapt the design for your own use, but please attribute the original project if you distribute it.

Parts

139

Qty	Value	Footprint	References
18	100nF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C20, C21, C27, C28, C30, C32, C33, C34, C35, C37, C38, C39, C41, C49, C50, C53 +2
16	10kΩ	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R2, R4, R7, R16, R21, R22, R23, R24, R25, R26, R31, R32, R33, R34, R35, R36
13	10uF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C1, C2, C3, C4, C15, C16, C31, C36, C40, C48, C51, C52, C55
5	10k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R10, R42, R43, R45, R46
5	1uF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C22, C46, C47, C60, C61
4	22pF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C11, C12, C23, C24
4	6.2kΩ	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R17, R18, R27, R28
4	680pF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C44, C45, C58, C59
4	8.2kΩ	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R19, R20, R29, R30
4	820pF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C42, C43, C56, C57
4	MountingHole_Pad_MP	MountingHole:MountingHole_2.2mm_M2_DIN965_Pad_TopBottom	H1, H2, H3, H4
3	18kΩ	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R11, R12, R37
3	2.2kΩ	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R6, R13, R15
3	Conn_01x03_Pin	Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical	J3, J9, J10
3	Conn_01x04_Pin	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J6, J7, J8
2	10nF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C5, C6
2	1uH	Inductor_SMD:L_APV_APH0420	L3, L4
2	220uF	Capacitor_SMD:CP_Elec_6.3x7.7	C7, C8
2	22uF	Capacitor_SMD:CP_Elec_4x5.4	C13, C14
2	22uH	Inductor_SMD:L_APV_ANR6028	L1, L2
2	470pF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C18, C19
2	B340A	Diode_SMD:D_SMA_Handsoldering	D2, D3
2	OPA1612AxD	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U7, U8
2	PMOS	Package_TO_SOT_SMD:SOT-23	Q5, Q6
2	TPS5430DDA	Package_SO:TI_SO-PowerPAD-8	U1, U2
1	100kΩ	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1
1	100Ω	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R8
1	12.288MHz	Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm	Y2
1	1kΩ	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R14
1	24LC256	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U6
1	3.3k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R3
1	3.3kΩ	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R5
1	3.3nF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C25
1	475Ω	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R9
1	47k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R44
1	47pF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C17
1	47uF	Capacitor_SMD:CP_Elec_5x5.4	C9
1	56nF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C26
1	600mA	balanced-receiver:Fuse_1812_4532Metric_Pad1.30x3.40mm_HandSolder	F1
1	9V	Diode_SMD:D_SOD-123	D1
1	ADAU1701	Package_QFP:LQFP-48_7x7mm_P0.5mm	U5
1	Conn_01x02_Pin	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J12
1	Conn_01x02_Pin	Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical	J4
1	Conn_02x04_Odd_Even	Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical	J5
1	LED	LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	D4
1	LM1117DT-3.3	Package_TO_SOT_SMD:SOT-223-3_TabPin2	U3
1	PNP	Package_TO_SOT_SMD:SOT-23	Q2
1	Power	Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical	J1
1	Q_PMOS_GDS	Package_TO_SOT_SMD:SOT-23	Q1
1	Screw_Terminal_01x02	balanced-receiver:JST_XH_B2B-XH-AM_1x02_P2.50mm_Vertical	J2
1	THAT1240	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U4

Questions

How big is the Balanced receiver PCB?

It measures 70 × 76 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Balanced receiver use?

139 parts, built around the TPS5430DDA, 24LC256-I/P, LM1117DT-3.3 and B340A. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Balanced receiver KiCad files?

From the brbcza/balanced-receiver repository on GitHub, at the commit this page was made from: the board is balanced-receiver.kicad_pcb and its schematic adau_1701.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Balanced receiver design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Audio and music

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/brbcza-balanced-receiver" title="Balanced receiver in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/brbcza-balanced-receiver.jpg" alt="Balanced receiver" width="1200" height="900">

A picture that opens the board, for a README

[![Balanced receiver](https://pcbkit.io/embed/boards/brbcza-balanced-receiver.jpg?size=s)](https://pcbkit.io/boards/brbcza-balanced-receiver)

Source

Repository: brbcza/balanced-receiver
Board file: balanced-receiver.kicad_pcb
Commit: d1e457d
Licence: GPL-3.0

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