2 layers62.6 × 38.8 mm
Preamp micro PCM2904
Totof34/Preamp_micro_USB
A small project to measure speaker with an electret via USB
25 parts1
2 layers62.5 × 38.8 mm
PCM2904
Totof34/Preamp_micro_USB1A small project to measure speaker with an electret via USB
- Size
- 62.5 × 38.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 29
- Pads
- 89
- Tracks, vias
- 120, 1
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 24 Jul 2013
- Updated
- 21 Dec 2013
Overview
PCM2904 is an open-source printed circuit board by Totof34, from the Totof34/Preamp_micro_USB repository on GitHub. It is a 2-layer board of 62.5 × 38.8 mm with 36 parts on 29 nets, routed with 120 tracks and 1 via.
It is built around the PCM2904DB. Its parts include 14 connectors, 11 capacitors, 7 resistors, 2 diodes and 1 IC. It belongs with the audio and music boards of this library.
Main components
1README
README.mdPreamp_micro_USB
A small project to measure speaker with an electret via USB
If you would have more information about this project please visit www.audiyofan.org
A link to the dedicated post http://www.audiyofan.org/forum/viewtopic.php?f=57&t=8948
It's just a box connected via USB , you don't need an external sound card to measure your speakers,
You can use REW or ARTA ( free demo version ) or an other program,
The project is based on a capsule electret, a microphone preamp, a loopback and a second channel with a secured probe to measure the voltage across the speaker ( for ARTA ) connected via a PCM2904 from BB/TI
Under Linux & Mac no drivers is required Under Windows you can find in the folder "Drivers_windows" all you need to run this box properly
PCB & schema are designed with Kicad
All comments are welcome
Totof
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 1µ | C2 | C6, C7, C8, C10, C11, C12, C14 |
| 4 | F | 1pin | P19, P20, P21, P22 |
| 2 | 1µ | CP_5x11mm | C9, C13 |
| 2 | 22 | R4-LARGE_PADS | R12, R13 |
| 2 | 22p | C1 | C15, C16 |
| 2 | Z_4V1 | D3 | D1, D2 |
| 1 | 1K5 | R4-LARGE_PADS | R10 |
| 1 | 1M | R4-LARGE_PADS | R14 |
| 1 | 2.2 | R4-LARGE_PADS | R11 |
| 1 | 8K2 | R4-LARGE_PADS | R17 |
| 1 | 910 | R4-LARGE_PADS | R16 |
| 1 | CH2_IN | PIN_ARRAY_1 | P15 |
| 1 | CH2_OUT | PIN_ARRAY_1 | P16 |
| 1 | CONN_GND | PIN_ARRAY_1 | P8 |
| 1 | CONN_V+ | PIN_ARRAY_1 | P9 |
| 1 | CRYSTAL_12Mhz | Crystal_HC49-U_Vertical_RevA_09Aug2010 | X1 |
| 1 | PCM2904 | SSOP28 | U2 |
| 1 | USB | USB_B | J1 |
| 1 | V_IN_L | PIN_ARRAY_1 | P11 |
| 1 | V_IN_R | PIN_ARRAY_1 | P12 |
| 1 | V_OUT | PIN_ARRAY_1 | P10 |
| 1 | V_OUT_L | PIN_ARRAY_1 | P13 |
| 1 | V_OUT_R | PIN_ARRAY_1 | P14 |
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Questions
How big is the PCM2904 PCB?
It measures 62.5 × 38.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PCM2904 use?
36 parts, built around the PCM2904DB. 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 PCM2904 KiCad files?
From the Totof34/Preamp_micro_USB repository on GitHub, at the commit this page was made from: the board is source_kicad/PCM2904/PCM2904.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the PCM2904 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Totof34 before reusing the design.