2 layers143.5 × 71.5 mm
2 layers91 × 56.5 mm
Control board
whatwareweb/audio-receiverOSHW audio reciever and amplifier
- Size
- 91 × 56.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 14
- Pads
- 50
- Tracks, vias
- 75, 3
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Jun 2025
- Updated
- 13 Sep 2026
Overview
Control board is an open-source printed circuit board by whatwareweb, from the whatwareweb/audio-receiver repository on GitHub. It is a 2-layer board of 91 × 56.5 mm with 11 parts on 14 nets, routed with 75 tracks and 3 vias.
It is built around the ATTINY84A-SSF. Its parts include 5 switches, 4 connectors, 1 capacitor and 1 IC. It belongs with the audio and music boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
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
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2, SW3, SW4, SW5 |
| 1 | 100nF | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C1 |
| 1 | ATtiny84A-SS | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | OLED | KiCad-SSD1306-0.91-OLED-4pin-128x32:SSD1306-0.91-OLED-4pin-128x32 | J1 |
| 1 | PROGRAM | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_CUI:TerminalBlock_CUI_TB007-508-02_1x02_P5.08mm_Horizontal | J4 |
| 1 | Screw_Terminal_01x04 | Connector_Phoenix_MSTB:PhoenixContact_MSTBA_2,5_4-G-5,08_1x04_P5.08mm_Horizontal | J3 |
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Questions
How big is the Control board PCB?
It measures 91 × 56.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Control board use?
11 parts, built around the ATTINY84A-SSF. 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 Control board KiCad files?
From the whatwareweb/audio-receiver repository on GitHub, at the commit this page was made from: the board is PCB/control-board/control-board.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 Control board design in my own project?
Its repository states no licence, so its author keeps all rights: ask whatwareweb before reusing the design.