2 layers91 × 56.5 mm
2 layers143.5 × 71.5 mm
Audio receiver
whatwareweb/audio-receiverOSHW audio reciever and amplifier
- Size
- 143.5 × 71.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 74
- Nets
- 41
- Pads
- 165
- Tracks, vias
- 226, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Jun 2025
- Updated
- 13 Sep 2026
Overview
Audio receiver is an open-source printed circuit board by whatwareweb, from the whatwareweb/audio-receiver repository on GitHub. It is a 2-layer board of 143.5 × 71.5 mm with 74 parts on 41 nets, routed with 226 tracks and 0 vias.
It is built around the UF4004, BD139 and BC559, with the BD140, MJE2955 and MJE3055 among its other parts. Its parts include 26 resistors, 16 capacitors, 16 diodes, 12 transistors and 3 connectors. It belongs with the audio and music boards of this library.
Main components
6
UF4004
DO-41-55℃~+175℃ 10uA@400V 1A 1V@1A 30A 400V Independent DO-41 Diodes - General Purpose ROHSLGEDiodes - General Purpose
BD139
TO-126-65℃~+150℃ 1 NPN 1.5A 10uA 12.5W 500mV 5V 63 80V NPN TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)
BC559
TO-92-31 PNP 100mA 110 150MHz 15nA 30V 500mW 5V 650mV PNP Standalone TO-92-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)BD140
TO-126-65℃~+150℃ 1 PNP 1.25W 1.5A 100nA 500mV 5V 63 80V PNP TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)
MJE2955
TO-220-3L-55℃~+150℃ 1 PNP 10A 1mA 20 2MHz 2W 5V 60V 8V PNP TO-220-3L Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
MJE3055
TO-220C1 NPN 100 10A 1mA 2MHz 2W 5V 60V 8V NPN Standalone TO-220C Bipolar (BJT) ROHSSPTECHBipolar (BJT)
README
README.mdaudio-receiver
OSHW audio reciever and amplifier
What is it
This is an audio receiver and amplifier with a classic design. I built it because I wanted to learn more about Class AB amplifier design and analog circuitry in general.
Why use it
Class-D amplifiers, as used in receivers these days, offer lots of power, but the sound quality can be lacking.
Class-AB amplifiers, while less efficient and therefore harder to get high power output, have overall less distortion and can offer a better signal-to-noise ratio if designed properly.
The design of the amplifier portion is similar to amplifiers built in the so-called "Golden age" of Hi-fi audio, in the 70s and 80s. I wanted a Class-AB amplifier that had the great sound quality of products from times gone by, but with modern features such as digital screens, and without the clunky mechanical interfaces of older receivers.
Goals
My goals for this project were to have good sound quality with modern features, and also to use industry standard practices for receiver assembly to make it easy to assemble.
Features
- Stereo audio amplifier
- 4 input channels
- Volume control
- Digitally selectable inputs
- OLED display with renamable inputs
- 15w per channel output
- All-analog signal path
- 3 separate PCBs for low noise
Usage
It is super simple, just hook up a line level signal to the RCA jacks on the back, and select your input and you're good to go!
Wiring
To wire up the internal parts, simply connect the +/-5v line from the first power supply to the input board, the +5v line to the control board, and the +36v line from the 2nd power supply to the amplifier board, as shown in the PCB silkscreen. Then, using the Phoenix cables in the BOM, connect the Phoenix connectors together.
PCB screenshots
BOM
Parts
74| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D9, D10, D11, D12 |
| 8 | 2k2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R6, R7, R12, R16, R19, R20, R25 |
| 8 | UF4004 | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D5, D6, D7, D8, D13, D14, D15, D16 |
| 6 | 100uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C2, C4, C8, C11, C12, C14 |
| 4 | 2R7 | Resistor_THT:R_Axial_Power_L25.0mm_W9.0mm_P27.94mm | R9, R10, R22, R23 |
| 4 | 33k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R14, R15 |
| 4 | BD139 | Package_TO_SOT_THT:TO-126-3_Vertical | Q2, Q3, Q8, Q9 |
| 2 | 100R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R4, R17 |
| 2 | 100nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C7, C16 |
| 2 | 100pF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C3, C13 |
| 2 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C9 |
| 2 | 12k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11, R24 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R18 |
| 2 | 2200uF | Capacitor_THT:CP_Radial_D16.0mm_P7.50mm | C5, C15 |
| 2 | 2R7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13, R26 |
| 2 | 33uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C6, C10 |
| 2 | 560 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R8, R21 |
| 2 | BC559 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q7 |
| 2 | BD140 | Package_TO_SOT_THT:TO-126-3_Vertical | Q4, Q10 |
| 2 | MJE2955 | Package_TO_SOT_THT:TO-220-3_Vertical | Q6, Q12 |
| 2 | MJE3055 | Package_TO_SOT_THT:TO-220-3_Vertical | Q5, Q11 |
| 1 | Fuse Holder | Fuse:Fuseholder_Clip-5x20mm_Eaton_1A5601-01_Inline_P20.80x6.76mm_D1.70mm_Horizontal | F1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_CUI:TerminalBlock_CUI_TB007-508-02_1x02_P5.08mm_Horizontal | J3 |
| 1 | Screw_Terminal_01x03 | Connector_Phoenix_MSTB:PhoenixContact_MSTBA_2,5_3-G-5,08_1x03_P5.08mm_Horizontal | J1 |
| 1 | Screw_Terminal_01x04 | TerminalBlock_CUI:TerminalBlock_CUI_TB007-508-04_1x04_P5.08mm_Horizontal | J2 |
More from whatwareweb/audio-receiver
2- 2 layers77.5 × 49.5 mm
Similar boards
- 2 layers421.8 × 132.1 mm
- 2 layers43.2 × 29.1 mm
- 2 layers88.8 × 76 mm
- 2 layers83.1 × 40.6 mm
12v autocut charger
ANSHUMANDOCX/AutoCut-Charger
Its a Autocut charger to charge a 12v Lead Acid Battery
23 parts - 2 layers301.9 × 194.8 mm
TRS80 Model I EI RevD
RetroStack/TRS-80-Model-I-Expansion-Interface-Rev-D
Hardware Replica of the TRS-80 Model I Expansion Interface - Revision D
185 partsMIT - 2 layers100 × 100 mm
- 2 layers84.5 × 82.6 mm
- 2 layers40 × 99 mm
Questions
How big is the Audio receiver PCB?
It measures 143.5 × 71.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Audio receiver use?
74 parts, built around the UF4004, BD139, BC559 and BD140. 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 Audio receiver KiCad files?
From the whatwareweb/audio-receiver repository on GitHub, at the commit this page was made from: the board is PCB/audio-receiver/audio-receiver.kicad_pcb and its schematic PCB/audio-receiver/amp-channel.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Audio receiver design in my own project?
Its repository states no licence, so its author keeps all rights: ask whatwareweb before reusing the design.