2 layers86 × 54 mm
4 layers80 × 40 mm
Echowawa
moonbeeper/echowawaYour typical DAC with bluetooth audio (with possible upgrades to use WiFi sources) and a USB C as an AUX port. It can output to either RCA jacks or a headphone jack.
- Size
- 80 × 40 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 145
- Nets
- 99
- Pads
- 401
- Tracks, vias
- 764, 78
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 28 Jul 2025
- Updated
- 28 Jul 2025
Overview
Echowawa is an open-source printed circuit board by moonbeeper, from the moonbeeper/echowawa repository on GitHub. It is a 4-layer board of 80 × 40 mm with 145 parts on 99 nets, routed with 764 tracks and 78 vias.
It is built around the F0505S-3WR2, PCM2912APJTR and XC6220B331MR, with the ADUM3160BRW, PCM5100APW and WS2812B-2020 among its other parts. Its parts include 50 capacitors, 23 resistors, 10 ICs, 7 connectors and 3 diodes. It belongs with the audio and music and radio and wireless boards and the ESP32 boards of this library.
Main components
6
F0505S-3WR2
SIP,19.5x7mm-40℃~+85℃ 1 100kHz 10mm 15mA 19.5mm 220uF 30mVp-p 3W 3kV 4.5V~5.5V 5V 600mA 7mm 84% Short Circuit Protection SIP,19.5x7mm Isolated Power Modules ROHSYLPTECIsolated Power Modules
PCM2912APJTR
TQFP-32_7x7-25℃~+70℃ 5V 8kHz、10.025kHz、16kHz、22.05kHz、32kHz、44.1kHz、48kHz Encoder/decoder USB TQFP-32(7x7) Audio Interface ICs ROHSTexas InstrumentsAudio Interface ICs
XC6220B331MR
SOT-23-5-40℃~+85℃@(Ta) 1 25uA 3.3V 400mV@(800mA) 5.5V 50dB@(10kHz) 900mA Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
ADUM3160BRW
SOIC16WFull/Low Speed 2.5 kV USB Digital IsolatorAnalog DevicesUncategorised
PCM5100APW
TSSOP-20-40℃~+130℃ 1.8V~3.3V 2 32 384kHz 50MHz Audio Decoder I2S TSSOP-20 ADCs/DACs - Special Purpose ROHSTexas InstrumentsADCs/DACs - Special Purpose
WS2812B-2020
SMD,2.2x2mm0.6mA 0.84mm 120us 160mcd 200mcd 2kHz 2mm 2mm 300ns 470.4nm 515.6nm 520mcd 5V 622.5nm 800Kbit/s Built-in power-on reset circuit、Built-in power-on reset circuit、Integrated intelligent reverse connection protection function Top-mount SMD,2.2x2mm RGB LEDs(Built-in IC) ROHSWorldsemiRGB LEDs(Built-In IC)
README
README.mdechowawa
[!NOTE] This project is still in progress and not even close to being finished. Not even built yet.
Your typical DAC with bluetooth audio (with possible upgrades to use WiFi sources) and a USB C as an AUX port. It can output to either RCA jacks or a headphone jack. It also features a pretty fancy oled screen with its cool menu navigated via the knob.
The reason I made this was because of the fact that I am no longer a fan of using cheap bluetooth magic boxes with bad audio output when I can make my own magic box with probably better audio quality and a better design.
Images
The echowawa pcb
The echowawa case
The echowawa root schematic
The echowawa power schematic
The echowawa audio schematic
BOM
NOTE: This is a copy of the BOM.csv file. The shipping cost might be actually higher than the price listed here.
Parts
145| Qty | Value | Footprint | References |
|---|---|---|---|
| 41 | LOGO | LOGO | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** +25 |
| 26 | 1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2, C3, C4, C10, C11, C13, C15, C16, C17, C18, C19, C20, C26, C28, C37 +10 |
| 5 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C24, C25, C27, C35, C38 |
| 4 | 10uF | Capacitor_SMD:CP_Elec_4x5.4 | C21, C29, C32, C39 |
| 4 | 2.2nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C41, C42, C45, C46 |
| 4 | 24k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6, R8, R11, R12 |
| 4 | 3.3K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R20, R21, R22, R23 |
| 4 | 5.1K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5, R7, R9, R10 |
| 4 | MountingHole | MountingHole:MountingHole_2.7mm_M2.5 | H1, H2, H3, H4 |
| 3 | 4.7k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R4 |
| 3 | 470 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R18, R19 |
| 2 | 100pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C31, C34 |
| 2 | 100uF | Capacitor_SMD:CP_Elec_6.3x7.7 | C47, C48 |
| 2 | 2.2uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C30, C33 |
| 2 | 27pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C22, C23 |
| 2 | 4.7uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C12, C14 |
| 2 | Conn_Coaxial | kicad_why:CONN-TH_AV-5 | J6, J7 |
| 2 | TS5A22364DGSR | Package_SO:VSSOP-10_3x3mm_P0.5mm | U9, U10 |
| 2 | Transformer_Audio | kicad_why:XFMR-SMD_4P-L7.1-W5.2-P2.54-LS9.2-BL | T1, T2 |
| 2 | WS2812B-2020 | LED_SMD:LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1, D2 |
| 2 | XC6220B331MR | Package_TO_SOT_SMD:SOT-23-5 | U3, U6 |
| 1 | 0 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13 |
| 1 | 1.5k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15 |
| 1 | 100 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R17 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R14 |
| 1 | 128x64 OLED | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R16 |
| 1 | 3.3uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C36 |
| 1 | 6.8uH | Inductor_SMD:L_6.3x6.3_H3 | L1 |
| 1 | 6MHz | Crystal:Crystal_SMD_HC49-SD_HandSoldering | Y1 |
| 1 | ADUM3160 | Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm | U4 |
| 1 | AudioJack3 | kicad_why:AUDIO-TH_PJ-3136-B | J5 |
| 1 | BOOT | kicad_why:SW-SMD_L3.9-W3.0-P4.45 | BOOT |
| 1 | ESP32-WROOM-32E-R2 | RF_Module:ESP32-WROOM-32D | U1 |
| 1 | F0505S-3WR2 | kicad_why:PWRM-TH_4P-L19.7-W6.0-P2.54_F2403S-1WR3 | U5 |
| 1 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3 |
| 1 | PCM2912APJTR | Package_QFP:TQFP-32_7x7mm_P0.8mm | U8 |
| 1 | PCM5100A | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U7 |
| 1 | Reset | kicad_why:SW-SMD_L3.9-W3.0-P4.45 | RESET |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW1 |
| 1 | TLP185xSE | Package_SO:SOIC-4_4.55x3.7mm_P2.54mm | U2 |
| 1 | UART | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | kicad_why:TYPE-C-SMD_TYPE-C-6P-073 | J3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J4 |
Questions
How big is the Echowawa PCB?
It measures 80 × 40 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Echowawa use?
145 parts, built around the F0505S-3WR2, PCM2912APJTR, XC6220B331MR and ADUM3160BRW. 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 Echowawa KiCad files?
From the moonbeeper/echowawa repository on GitHub, at the commit this page was made from: the board is PCB/echowawa.kicad_pcb and its schematic PCB/audio.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Echowawa design in my own project?
Its repository states no licence, so its author keeps all rights: ask moonbeeper before reusing the design.
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