VoxEMG
About the VoxEMG PCB
VoxEMG is an open source PCB design by courtcourtaney, published on GitHub. It is a 2-layer board measuring 37.6 × 32.1 mm, with 40 components from 18 distinct parts.
Other key parts include the OPA1612AID. By type, the board carries 18 resistors, 8 capacitors, 6 connectors, 2 ICs and 2 diodes.
From the project
VoxEMG circuit and schematics, plus example code for further digital filtering with Bela, etc.
The VoxEMG circuit is an extension of the open-source EMG Circuit v7.1 (Advancer Technologies), from which other EMG platforms such as the Myoware are derived. VoxEMG is specifically aimed to detect activation of the extrinsic laryngeal muscles in both vocalised and subvocalised singing. High-precision and trimmable resistors are used to ensure noise reduction and the circuit is flexible to be used with different types of electrodes for desired implementation. The EMG signals can then be used in a variety of manners, for instance to relay feedback about the singer's movements during practice.
Main components on the VoxEMG
VoxEMG bill of materials (BOM)
40 components, 18 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | OPA1612AID | OPA1612AID | U1, U2 |
| 2 | Conn_01x03_Female | JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J1, J3 |
| 1 | Conn_01x03_Female | Thread_CastellationHoles_1x3 | J1B1 |
| 1 | Conn_01x02_Female | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J2 |
| 1 | Conn_01x02_Female | Thread_CastellationHoles_1x2 | J2B1 |
| 1 | Conn_01x04_Female | JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J4 |
| 2 | 500Ω | Potentiometer_Bourns_3314J_Vertical | RV5, RV16 |
| 2 | 100kΩ | Potentiometer_Bourns_3314J_Vertical | RV11, RV22 |
| 2 | D_Schottky_x2_Serial_AKC | BAS40-04W | D1, D2 |
| 1 | 2nF | C_0402_1005Metric | C1 |
| 4 | 10uF | C_0402_1005Metric | C2, C3, C6, C7 |
| 2 | 0.1uF | C_0402_1005Metric | C4, C8 |
| 1 | 2.2nF | C_0402_1005Metric | C5 |
| 6 | 10kΩ | R_0402_1005Metric | R1, R2, R7, R12, R13, R18 |
| 6 | 100kΩ | R_0402_1005Metric | R3, R4, R10, R14, R15, R21 |
| 2 | 100Ω | R_0402_1005Metric | R6, R17 |
| 2 | 150kΩ | R_0402_1005Metric | R8, R19 |
| 2 | 1kΩ | R_0402_1005Metric | R9, R20 |
VoxEMG design files
The KiCad project lives in the courtcourtaney/voxEMG repository on GitHub; these links point at the commit this page was built from.
VoxEMG: common questions
How big is the VoxEMG PCB?
The VoxEMG measures 37.6 × 32.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the VoxEMG?
40 components, from 18 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 VoxEMG design files?
From the courtcourtaney/voxEMG repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the VoxEMG design in my own project?
The repository has no license, so all rights stay with courtcourtaney. Use it as a reference, and ask the author before reusing the design.