2 layers148 × 84.5 mm
Panel daisy
ohmtech-rdi/eurorack-blocks
Software to Hardware Prototyping for Eurorack using C++, Max/Gen~ or Faust
259 parts410
2 layers45.3 × 34.2 mm
Stereo mic amplifier
CarlosGS/OpenBinaural72Low-cost 3D-printable binaural microphone
- Size
- 45.3 × 34.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 14
- Pads
- 63
- Tracks, vias
- 183, 0
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 10 May 2015
- Updated
- 19 Jan 2024
Overview
Stereo mic amplifier is an open-source printed circuit board by CarlosGS, from the CarlosGS/OpenBinaural repository on GitHub. It is a 2-layer board of 45.3 × 34.2 mm with 26 parts on 14 nets, routed with 183 tracks and 0 vias.
It is built around the TL072. Its parts include 9 capacitors, 9 resistors, 4 connectors, 2 diodes and 1 IC. It belongs with the audio and music boards of this library.
Main components
1README
Electronics/README.mdStereo microphone amplifier
Stereo microphone amplifier circuit with gain control.
The circuit has been tested with the POM-5238P-R microphone capsules:
http://www.puiaudio.com/product-detail.aspx?categoryId=4&partnumber=POM-5238P-R
CNC manufacture files (gerbers, FlatCAM project & gcodes) are available in the Gerber folder.
Assembly instructions
Click here for the full assembly instructions
Pictures
Aprox milling time for 0.8mm drill: 4 minutes
Aprox milling time for 1.2mm drill: 2 minutes
Aprox milling time for 0.3mm copper etching: 20 minutes
Aprox milling time for 2mm edges routing: 3 minutes
Acknowledgments
This circuit is a derivation from the following -very useful- Texas Instruments guide:
Single-Supply, Electret Microphone Preamplifier Reference Design by John Caldwell
Gain control is achieved by replacing R2 (75k) with a 100k dual potentiometer.
Author & license
Author: Carlos Garcia Saura (http://www.carlosgs.es)
License: CC-BY-SA (http://creativecommons.org/licenses/by-sa/4.0/)
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 2.2uF | Discret:C1V8 | C1, C2, C3, C8, C9 |
| 3 | 13.7k | Resistors_ThroughHole:Resistor_Horizontal_RM10mm | R1, R2, R7 |
| 2 | 100k | Resistors_ThroughHole:Resistor_Vertical_RM5mm | R8, R9 |
| 2 | 100k | Resistors_ThroughHole:Resistor_Horizontal_RM10mm | R3, R4 |
| 2 | 15pF | Capacitors_ThroughHole:C_Disc_D7.5_P5 | C4, C5 |
| 2 | 51 | Resistors_ThroughHole:Resistor_Vertical_RM5mm | R5, R6 |
| 1 | 100nF | Capacitors_ThroughHole:C_Disc_D7.5_P5 | C7 |
| 1 | 1N4001 | Discret:D3 | D1 |
| 1 | 22uF | Discret:C1V8 | C6 |
| 1 | CONN_01X03 | Pin_Headers:Pin_Header_Straight_1x03 | P4 |
| 1 | DUAL_POT_OK | Potentiometers:Potentiometer_Alps-RK163-double_15mm | RV1 |
| 1 | LED | LEDs:LED-5MM | D2 |
| 1 | TL072 | Sockets_DIP:DIP-8__300_ELL | U1 |
| 1 | batt | Pin_Headers:Pin_Header_Straight_1x02 | P3 |
| 1 | mic_L | Pin_Headers:Pin_Header_Straight_1x02 | P1 |
| 1 | mic_R | Pin_Headers:Pin_Header_Straight_1x02 | P2 |
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Questions
How big is the Stereo mic amplifier PCB?
It measures 45.3 × 34.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Stereo mic amplifier use?
26 parts, built around the TL072. 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 Stereo mic amplifier KiCad files?
From the CarlosGS/OpenBinaural repository on GitHub, at the commit this page was made from: the board is Electronics/stereo_mic_amplifier.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Stereo mic amplifier design in my own project?
Its repository states no licence, so its author keeps all rights: ask CarlosGS before reusing the design.