4 layers128 × 79 mm
4 layers44.1 × 50 mm
USB Mic
ConfusedHello/USB-Mic19A DIY USB-C Microphone!
- Size
- 44.1 × 50 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 71
- Nets
- 53
- Pads
- 219
- Tracks, vias
- 415, 100
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 10 Jun 2025
- Updated
- 20 Aug 2025
Overview
USB Mic is an open-source printed circuit board by ConfusedHello, from the ConfusedHello/USB-Mic repository on GitHub. It is a 4-layer board of 44.1 × 50 mm with 71 parts on 53 nets, routed with 415 tracks and 100 vias.
It is built around the B0505S-3WR2, PCM2912APJTR and ADUM3160BRWZ-RL, with the TPS7A8901RTJR and GT-USB-7010ASV among its other parts. Its parts include 31 capacitors, 21 resistors, 4 ICs, 3 connectors and 2 diodes.
Main components
5
B0505S-3WR2
SIP,19.7x7mm-40℃~+85℃ 1 1.5kV 10.16mm 19.65mm 2400uF 250kHz 3W 4.5V~5.5V 5V 600mA 6mA 7mm 80mVp-p 87% Short Circuit Protection SIP,19.7x7mm Isolated Power Modules ROHSEVISUNIsolated 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
ADUM3160BRWZ-RL
SOIC-16-300mil12Mbps 2500 USB 2.0 USB rate adaptation、USB transparent isolation、Low-Power Consumption、Integrated isolated power supply SOIC-16-300mil Isolated USB ICs ROHSAnalog DevicesIsolated USB ICs
TPS7A8901RTJR
QFN-20-EP(4x4)-40℃~+125℃@(Tj) 180mV@(2A) 2 2A 3.5mA 3.8uVrms 40dB@(1MHz) 6.5V 800mV~5.2V Adjustable Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection、Soft Start、Enable QFN-20-EP(4x4) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
GT-USB-7010ASV
SMD-40℃~+85℃ 1 1.68mm 10,000 Cycles 16P 24V 3A 7.35mm Black Female Surface Mount, Right Angle Type-C USB 2.0 SMD USB Connectors ROHSG-SwitchUSB Connectors
README
README.mdVOXMIC - A DIY Studio-Quality USB-C Microphone
Film lights shouldn't be so insanely expensive, but you know what else shouldn't be either? A quality microphone. VoxMic is a completely DIY mic I've designed for the Hack Club Highway to Hardware program!
QUICK WARNING: This WILL NOT WORK without the bodged fixes more information here
This is definitely the largest project I've ever worked on - Version 1 along has gone though 6 entire revisions just to get to where it is now. V2 is in the works!!!
For details about the design process or other information, check out the development journal. A local copy is available in JOURNAL.md.
The Design
Here's a quick diagram of the main components on the PCB~
As well as the design for the PCB!
And a quick image of the case-
Click to expand/collapse
Bill of Materials
Also available in .csv format in BOM.csv!
Total (USD): $174.57
Notes for v2
- Capacitive touch button for muting
- Better status signalling to user
- Upgrade ADC/DAC
Made with ❤️ by @ConfusedHello
Parts
71| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 1µF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C15, C16, C17, C26, C27 |
| 5 | LOGO | LOGO | G***, G***, G***, G***, G*** |
| 4 | 22µF | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C8, C9, C12, C13 |
| 4 | 24Ω | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R4, R5, R6 |
| 4 | 3.3kΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R19, R20, R21, R22 |
| 3 | 1µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C7, C23 |
| 3 | 3.3µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C18, C21, C22 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C5, C6 |
| 2 | 100pF | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C19, C20 |
| 2 | 10nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C10, C11 |
| 2 | 16Ω | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R17, R18 |
| 2 | 22nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C28, C29 |
| 2 | 22pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C24, C25 |
| 2 | 4.7µF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2 |
| 2 | 470µF | footprints:CAP-SMD_BD10.0-L10.3-W10.3-LS11.0-FD-1 | C30, C31 |
| 2 | 5.1kΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2 |
| 2 | 91Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R14, R15 |
| 1 | 1.5kΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13 |
| 1 | 10.7kΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R9 |
| 1 | 10kΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7 |
| 1 | 10µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | 1MΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R16 |
| 1 | 2.2µF | footprints:CAP-TH_L17.5-W10.0-P15.00-D1.2 | C14 |
| 1 | 33.2kΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R10 |
| 1 | 400Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12 |
| 1 | 47.5kΩ | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8 |
| 1 | 6.8µH | footprints:IND-SMD_L4.0-W4.0_YHNR4020 | L1 |
| 1 | 6MHz | footprints:ABLS | Y1 |
| 1 | ADUM3160BRWZ-RL | footprints:SOIC127P1032X265-16N | IC1 |
| 1 | B0505S-3WR2 | footprints:B0505S-3WR2 | U1 |
| 1 | GT-USB-7010ASV | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J1 |
| 1 | LED B | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | LED G | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
| 1 | PCM2912APJTR | footprints:QFP80P900X900X120-32N | IC3 |
| 1 | PJ-313 5JCJ | footprints:AUDIO-TH_PJ-313_5JCJ | J2 |
| 1 | TPS7A8901RTJR | footprints:QFN50P400X400X80-21N-D | IC2 |
| 1 | Wires | Connector_Wire:SolderWire-0.1sqmm_1x02_P3.6mm_D0.4mm_OD1mm | J3 |
The 68 most common of 71 parts.
Questions
How big is the USB Mic PCB?
It measures 44.1 × 50 mm and has 4 copper layers, 1.6 mm thick.
What parts does the USB Mic use?
71 parts, built around the B0505S-3WR2, PCM2912APJTR, ADUM3160BRWZ-RL and TPS7A8901RTJR. 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 USB Mic KiCad files?
From the ConfusedHello/USB-Mic repository on GitHub, at the commit this page was made from: the board is src/PCB/USB Mic.kicad_pcb and its schematic src/PCB/USB Mic.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the USB Mic design in my own project?
Its repository states no licence, so its author keeps all rights: ask ConfusedHello before reusing the design.
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