2 layers47 × 81.5 mm
2 layers71 × 48 mm
Extension of ECE5 PCB design extra credit.
- Size
- 71 × 48 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 47
- Nets
- 30
- Pads
- 104
- Tracks, vias
- 82, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 May 2026
- Updated
- 13 May 2026
Overview
Speaker is an open-source printed circuit board by ActuallyWorked, from the ActuallyWorked/Stereo_Speaker_V2 repository on GitHub. It is a 2-layer board of 71 × 48 mm with 47 parts on 30 nets, routed with 82 tracks and 0 vias.
It is built around the LM386 and L7809. Its parts include 20 capacitors, 10 resistors, 4 connectors, 3 ICs and 1 diode. It belongs with the audio and music boards of this library.
Main components
2
LM386
SOP-80.2% 0℃~+70℃ 4V~12V 4mA 50dB 700mWx1@8Ω Analog voltage gain SOP-8 Audio Amplifiers ROHSGcoreAudio Power OpAmps
L7809
TO-220-20℃~+125℃@(Tj) 1 1.5A 2V@(1.0A) 35V 58uV 5mA 66dB@(120Hz) 9V Fixed Positive TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSPUOLOPVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdStereo_Speaker_V2
ECE5 extra credit assignment tasked students with designing a PCB from a provided mono-amplifier schematic. This is an extended version with the following modifications:
Converted the mono circuit into stereo, added a band-pass filter (80Hz-16kHz), 9V regulator, LED power indicator, and integrated with a 100W USB-C PD module from Aliexpress to allow for 100W charging/discharging for mobile devices if needed.
Reasoning:
Band-pass filter was used to compensate for the extra-long audio cable
9V regulator was used to allow for other power sources besides the in-class 9V alkaline battery -- allowed for Li-ion battery pack to be used and for the use of the 100W USB-C module)
LED power indicator was used to reduce power loss on the LDO and was a nice-to-have feature
100W USB-C module was added because I wanted a battery bank, and I realized I could make a speaker and portable battery at the same time.
Parts
47| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 0.1uF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3, C4, C7, C8, C11, C12, C13, C14, C17, C18, C19, C20 |
| 4 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R7, R8 |
| 3 | 10 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6, R10 |
| 2 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4 |
| 2 | 1000uF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C15, C16 |
| 2 | 100uF | Capacitor_THT:CP_Radial_D8.0mm_P2.50mm | C5, C6 |
| 2 | 10K | Potentiometer_THT:Potentiometer_Bourns_3386C_Horizontal | RV1, RV2 |
| 2 | 10uF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C9, C10 |
| 2 | LM386 | Package_DIP:DIP-8_W7.62mm | U1, U2 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | Conn_01x03_Socket | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J3 |
| 1 | Jumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | 9V=CLOSE |
| 1 | L7809 | Package_TO_SOT_THT:TO-220-3_Vertical | U3 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | LOGO | LOGO | G*** |
| 1 | OUT_L | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J4 |
| 1 | OUT_R | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J5 |
| 1 | PWR | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J1 |
| 1 | SW_SPST | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | SW1 |
The 43 most common of 47 parts.
Questions
How big is the Speaker PCB?
It measures 71 × 48 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Speaker use?
47 parts, built around the LM386 and L7809. 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 Speaker KiCad files?
From the ActuallyWorked/Stereo_Speaker_V2 repository on GitHub, at the commit this page was made from: the board is Speaker/Speaker.kicad_pcb and its schematic Speaker/Speaker.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Speaker design in my own project?
Its repository states no licence, so its author keeps all rights: ask ActuallyWorked before reusing the design.
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