2 layers
TransducerDriver
WPIRoboticsProjects/Lionfish-AcousticLink
This is the repo for acoustic modem and localization from acoustic modem
25 parts1
2 layers47.5 × 67.5 mm
Microphone preamp
polykit/microphone-preamp16Schematics and PCB for a microphone preamp with phantom power
- Size
- 47.5 × 67.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 47
- Nets
- 23
- Pads
- 91
- Tracks, vias
- 127, 4
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 21 Sep 2021
- Updated
- 21 Sep 2021
Overview
Microphone preamp is an open-source printed circuit board by polykit, from the polykit/microphone-preamp repository on GitHub. It is a 2-layer board of 47.5 × 67.5 mm with 47 parts on 23 nets, routed with 127 tracks and 4 vias.
It is built around the INA217AIP. Its parts include 11 resistors, 10 capacitors, 7 connectors, 4 diodes and 2 ICs. It belongs with the audio and music boards of this library.
Main components
1README
README.mdMicrophone preamp with phantom power
This repository contains schematics and PCB of a microphone preamp with switchable phantom power. It is based on the INA217 low-noise instrumentation amplifier. An additional buck-boost converter is needed for a phantom power higher than 12V.
BOM
| Reference | Quantity | Value | Note |
|---|---|---|---|
| C1 C3 C6 C7 C8 | 5 | 100n | Ceramic caps |
| C9 C10 | 2 | 10u | |
| C2 | 1 | 47u/50 | |
| C4 C5 | 2 | 47u/50** | Bipolar caps |
| D1 D2 D3 D4 | 4 | 1N4148 | |
| J1 | 1 | LED | Molex KK 2.54mm 2-pin connector |
| J2 | 1 | PHANTOM POWER | Molex KK 2.54mm 3-pin connector |
| J3 | 1 | MIC XLR | Molex KK 2.54mm 3-pin connector |
| J4 | 1 | PHANTOM POWER SW | Molex KK 2.54mm 3-pin connector |
| J5 | 1 | GAIN 10k | Molex KK 2.54mm 2-pin connector |
| J6 | 1 | OUT | Molex KK 2.54mm 2-pin connector |
| J7 | 1 | POWER | 10-pin IDC connector |
| R1 | 1 | 10k* | |
| R10 R11 | 2 | 10 | |
| R2 R3 | 2 | 6k8 | |
| R4 | 1 | 47k | |
| R5 R6 | 2 | 2k2 | |
| R7 | 1 | 100*** | |
| R8 | 1 | 1M | |
| R9 | 1 | 1k | |
| U1 | 1 | INA217 | DIP-8 package |
| U2 | 1 | TL071 | |
| 1 | XLR socket | Microphone input socket | |
| 1 | Output jack | ||
| 1 | 10k pot | ||
| 1 | Switch SPDT | ON-ON | |
| 1 | LED |
* LED current limiting resistor, change value according to used phantom power, 10k is for 48V
** use bipolar caps
*** adjust to change max. gain, smaller is more gain
Reference
Parts
47| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | LOGO | Polykit:star-silk-tiny | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** |
| 5 | 100n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C3, C6, C7, C8 |
| 4 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4 |
| 2 | 10 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R11 |
| 2 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C9, C10 |
| 2 | 2k2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6 |
| 2 | 47u/50** | Capacitor_THT:C_Radial_D10.0mm_H12.5mm_P5.00mm | C4, C5 |
| 2 | 6k8 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3 |
| 1 | 100*** | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 10k* | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 47u/50 | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C2 |
| 1 | GAIN 10k | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J5 |
| 1 | INA217 | Package_DIP:DIP-8_W7.62mm_Socket_LongPads | U1 |
| 1 | LED | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J1 |
| 1 | LOGO | Polykit:bär-small | G*** |
| 1 | MIC XLR | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J3 |
| 1 | OUT | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J6 |
| 1 | PHANTOM POWER | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J2 |
| 1 | PHANTOM POWER SW | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J4 |
| 1 | POWER | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J7 |
| 1 | TL071 | Package_DIP:DIP-8_W7.62mm_Socket_LongPads | U2 |
Questions
How big is the Microphone preamp PCB?
It measures 47.5 × 67.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Microphone preamp use?
47 parts, built around the INA217AIP. 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 Microphone preamp KiCad files?
From the polykit/microphone-preamp repository on GitHub, at the commit this page was made from: the board is microphone-preamp.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Microphone preamp design in my own project?
Its repository states no licence, so its author keeps all rights: ask polykit before reusing the design.
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