USB-Mic

ConfusedHello·USB-Mic·src/PCB/USB Mic.kicad_pcb

About the USB-Mic PCB

USB-Mic is an open source PCB design by ConfusedHello, published on GitHub. It is a 4-layer board measuring 44.1 × 50 mm, with 63 components from 36 distinct parts.

Other key parts include the ADUM3160BRWZ-RL, TPS7A8901RTJR, PCM2912APJTR and B0505S-3WR2. By type, the board carries 31 capacitors, 21 resistors, 4 ICs, 3 connectors, 2 diodes and 1 crystal.

From the project

A DIY USB-C Microphone!

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.

USB-Mic, from the project README — From the project README

Main components on the USB-Mic

ADUM3160BRWZ-RL TPS7A8901RTJR PCM2912APJTR B0505S-3WR2

USB-Mic bill of materials (BOM)

63 components, 36 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	ADUM3160BRWZ-RL	SOIC127P1032X265-16N	IC1
1	TPS7A8901RTJR	QFN50P400X400X80-21N-D	IC2
1	PCM2912APJTR	QFP80P900X900X120-32N	IC3
1	B0505S-3WR2	B0505S-3WR2	U1
1	6MHz	ABLS	Y1
1	GT-USB-7010ASV	USB_C_Receptacle_G-Switch_GT-USB-7010ASV	J1
1	PJ-313 5JCJ	AUDIO-TH_PJ-313_5JCJ	J2
1	Wires	SolderWire-0.1sqmm_1x02_P3.6mm_D0.4mm_OD1mm	J3
1	LED B	LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D1
1	LED G	LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D2
1	6.8µH	IND-SMD_L4.0-W4.0_YHNR4020	L1
2	4.7µF	C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C1, C2
1	10µF	C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C3
3	1µF	C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C4, C7, C23
2	100nF	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C5, C6
4	22µF	C_1210_3225Metric_Pad1.33x2.70mm_HandSolder	C8, C9, C12, C13
2	10nF	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C10, C11
1	2.2µF	CAP-TH_L17.5-W10.0-P15.00-D1.2	C14
5	1µF	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C15, C16, C17, C26, C27
3	3.3µF	C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C18, C21, C22

Show 16 more

Qty	Part	Footprint	Refs
2	100pF	C_0402_1005Metric_Pad0.74x0.62mm_HandSolder	C19, C20
2	22pF	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C24, C25
2	22nF	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C28, C29
2	470µF	CAP-SMD_BD10.0-L10.3-W10.3-LS11.0-FD-1	C30, C31
2	5.1kΩ	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R1, R2
4	24Ω	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R3, R4, R5, R6
1	10kΩ	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R7
1	47.5kΩ	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R8
1	10.7kΩ	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R9
1	33.2kΩ	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R10
1	400Ω	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R12
1	1.5kΩ	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R13
2	91Ω	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R14, R15
1	1MΩ	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R16
2	16Ω	R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R17, R18
4	3.3kΩ	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R19, R20, R21, R22

USB-Mic design files

The KiCad project lives in the ConfusedHello/USB-Mic repository on GitHub; these links point at the commit this page was built from.

USB-Mic: common questions

How big is the USB-Mic PCB?

The USB-Mic measures 44.1 × 50 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the USB-Mic?

63 components, from 36 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the USB-Mic design files?

From the ConfusedHello/USB-Mic repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the USB-Mic design in my own project?

The repository has no license, so all rights stay with ConfusedHello. Use it as a reference, and ask the author before reusing the design.