2 layers59.1 × 55.9 mm
Arduino Uno STIM ShieldII v4
zeph-bit/EMGStimCombo
Stackable sEMG and TENS combination device.
40 parts
2 layers57.2 × 114.3 mm
Stimbox emg combo
zeph-bit/EMGStimComboStackable sEMG and TENS combination device.
- Size
- 57.2 × 114.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 90
- Pads
- 220
- Tracks, vias
- 597, 67
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 7 May 2026
- Updated
- 9 May 2026
Overview
Stimbox emg combo is an open-source printed circuit board by zeph-bit, from the zeph-bit/EMGStimCombo repository on GitHub. It is a 2-layer board of 57.2 × 114.3 mm with 62 parts on 90 nets, routed with 597 tracks and 67 vias.
It is built around the INA818ID, OPA140AID and AD5204BRZ10, with the MJD340T4, MJD350T4 and S2B-XH-A(LF)(SN) among its other parts. Its parts include 16 resistors, 10 capacitors, 8 ICs, 6 diodes and 2 connectors.
Main components
6
INA818ID
SOIC-8-18V~-2.25V、2.25V~18V -40℃~+125℃ 0.025% 0.9V/us 1 105dB 10uV 120dB 12us 150pA 150pA 20mA 350uA 4.5V~36V 400nV/℃ 8nV/√Hz@1kHz External resistor gain、Overvoltage protection、EMI filtering/RF suppression SOIC-8 Instrumentation Amplifiers ROHSTexas InstrumentsInstrumentation AmplifiersOPA140AID
SOIC-8-18V~-2.25V、2.25V~18V -40℃~+125℃ 1 1.8mA 10pA 10pA 11MHz 120uV 140dB 1uV/℃ 20V/us 36mA 4.5V~36V 5.1nV/√Hz@1kHz Rail-to-rail output Reverse-phase input protection SOIC-8 Precision Op Amps ROHSTexas InstrumentsPrecision Op Amps
AD5204BRZ10
SOIC-24-300mil-40℃~+85℃ 10kΩ 2.7V~5.5V 256 4 50Ω、100Ω 700ppm/℃ 721kHz Linear SPI Soft reset、Power-on reset ±30% SOIC-24-300mil Digital Potentiometers ROHSAnalog DevicesDigital Potentiometers
MJD340T4
TO-252-65℃~+150℃ 1 NPN 100uA 15W 30 300V 3V 500mA NPN TO-252 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)
MJD350T4
TO-252-65℃~+150℃ 1 PNP 100uA 15W 30 300V 3V 500mA PNP TO-252 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)
S2B-XH-A(LF)(SN)
弯插,P=2.5mm-25℃~+85℃ 1 11.5mm 1x2P 2 2.5mm 250V 2P 3A 6.1mm 7.4mm Brass K Pin PA66 Right Angle Tin UL94V-0 White XH 弯插,P=2.5mm Wire To Board Connector ROHSJSTWire To Board Connector
README
README.mdEMGStimCombo
Stackable sEMG and TENS combination device.
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | OPA140AID | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2, U3, U4, U5, U8 |
| 4 | 10uF | Capacitor_SMD:C_2220_5750Metric | C9, C10, C11, C13 |
| 4 | 1N5400 | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D1, D2, D3, D4 |
| 4 | 1uF | Capacitor_SMD:C_2220_5750Metric | C5, C6, C7, C8 |
| 4 | 50K | Resistor_SMD:R_1206_3216Metric | R3, R5, R7, R8 |
| 4 | PINHD-1X3 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP10, JP11, JP12, JP13 |
| 3 | MJD340T4 | MJD340T4:TO-252_6P6X6P2X2P25_STM | U$1, U$3, U$6 |
| 3 | MJD350T4 | MJD350T4:TO-252_6P6X6P2X2P25_STM | U$2, U$4, U$7 |
| 2 | 100K | Resistor_SMD:R_1206_3216Metric | R9, R10 |
| 2 | 10K | Resistor_SMD:R_1206_3216Metric | R4, R6 |
| 2 | 10k | Resistor_SMD:R_1206_3216Metric | R12, R13 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric | R1, R15 |
| 2 | 333 | Resistor_SMD:R_1206_3216Metric | R2, R11 |
| 2 | LEDCHIPLED_1206 | LED_SMD:LED_1206_3216Metric | LED1, LED2 |
| 2 | PINHD-1X1 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | BATT-1, BATT+1 |
| 2 | PINHD-1X3-STACK | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | JP2, JP14 |
| 2 | PINHD-1X6 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | JP4, JP7 |
| 2 | PINHD-1X6-STACK | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | JP3, JP5 |
| 2 | S2B-XH-A(LF)(SN) | Connector_JST:JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | P1, P2 |
| 1 | .1uF | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | 220k | Resistor_SMD:R_1206_3216Metric | R16 |
| 1 | 33k | Resistor_SMD:R_1206_3216Metric | R14 |
| 1 | 4.7nF | Capacitor_SMD:C_2220_5750Metric | C12 |
| 1 | AD5204BRZ10 | AD5204BRZ10:RW_24_ADI | U6 |
| 1 | INA149AIDR | INA149AID:D0008A_L | U1 |
| 1 | INA818 | INA818:SOIC-8_TEX | U7 |
| 1 | IPBT-102-H1-XX-S-RA | IPBT-102-H1-XX-S-RA:IPBT-102-H1-XX-S-RA | U$5 |
| 1 | PINHD-1X8-STACK | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | JP6 |
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Questions
How big is the Stimbox emg combo PCB?
It measures 57.2 × 114.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Stimbox emg combo use?
62 parts, built around the INA818ID, OPA140AID, AD5204BRZ10 and MJD340T4. 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 Stimbox emg combo KiCad files?
From the zeph-bit/EMGStimCombo repository on GitHub, at the commit this page was made from: the board is Circuit_Design/stimbox_emg_combo.kicad_pcb and its schematic Circuit_Design/stimbox_emg_combo.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Stimbox emg combo design in my own project?
Its repository states no licence, so its author keeps all rights: ask zeph-bit before reusing the design.