2 layers152 × 88 mm
RFBitBangSMT
profdc9/RFBitBanger
A QRP digital transceiver created from readily available parts for off-the-grid maintenance
271 parts222
2 layers63 × 49 mm
AudioV2
SimasBar/Lm386AudioAmpSimple stereo audio amp using LM386 ICs
- Size
- 63 × 49 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 26
- Pads
- 83
- Tracks, vias
- 185, 0
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 29 Aug 2024
- Updated
- 5 Jun 2025
Overview
AudioV2 is an open-source printed circuit board by SimasBar, from the SimasBar/Lm386AudioAmp repository on GitHub. It is a 2-layer board of 63 × 49 mm with 24 parts on 26 nets, routed with 185 tracks and 0 vias.
It is built around the LM386. Its parts include 12 capacitors, 3 resistors, 3 ICs and 1 connector. It belongs with the audio and music boards of this library.
Main components
1README
README.mdStereo audio amp
Designed a simple audio amplifier using ICs that I had laying around. First version only used a single LM386 IC, after testing I realized that I like stereo sound better, thus additional 2 ICs were incorporated.
Works from 5-12V, although you need a clean power supply, or add some decoupling caps to the schematic.
I just soldered a RC filter on USB cable and it improved the sound by a lot lol
Schematic
In action
https://github.com/user-attachments/assets/e09e7879-84f1-4b41-a272-c4d77047949b
https://github.com/user-attachments/assets/d6cc784e-8589-41d5-b497-8c2914547d46
Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 0.1uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C4, C5, C6 |
| 3 | 10 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3 |
| 3 | 1000uF | Capacitor_THT:CP_Radial_D10.0mm_P3.50mm | C1, C2, C3 |
| 3 | 10uF | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C10, C11, C12 |
| 3 | LM386 | Package_DIP:DIP-8_W7.62mm | U1, U2, U3 |
| 2 | 47pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C7, C8 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C9 |
| 1 | AudioJack3 | Connector_Audio:Jack_3.5mm_CUI_SJ1-3525N_Horizontal | J1 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_Wuerth_6941xx301002 | 9V |
| 1 | Left | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | Left |
| 1 | PotLog10K | Potentiometer_THT:Potentiometer_Alps_RK163_Dual_Horizontal | RV1 |
| 1 | Right | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | Right |
| 1 | USB_A | Connector_USB:USB_A_CONNFLY_DS1095-WNR0 | 5V |
Questions
How big is the AudioV2 PCB?
It measures 63 × 49 mm and has 2 copper layers, 1.6 mm thick.
What parts does the AudioV2 use?
24 parts, built around the LM386. 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 AudioV2 KiCad files?
From the SimasBar/Lm386AudioAmp repository on GitHub, at the commit this page was made from: the board is AudioV2.kicad_pcb and its schematic AudioV2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the AudioV2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask SimasBar before reusing the design.
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