4 layers147.2 × 96.3 mm
ShieldPCB
AErbsloeh/stimulation_genv3
Hardware Design Files for Experimental Stimulation Platform (Gen 3)
142 partsMIT
2 layers69.5 × 47 mm
BackupECG2
namtu06/ecg-amplifierDesigning an ECG amplifier from scratch with KiCad (part of Biomedical Instrumentation coursework)
- Size
- 69.5 × 47 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 25
- Pads
- 101
- Tracks, vias
- 209, 23
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 20 Apr 2026
- Updated
- 20 Apr 2026
Overview
BackupECG2 is an open-source printed circuit board by namtu06, from the namtu06/ecg-amplifier repository on GitHub. It is a 2-layer board of 69.5 × 47 mm with 30 parts on 25 nets, routed with 209 tracks and 23 vias.
It is built around the ADR421ARMZ. Its parts include 13 resistors, 9 capacitors, 6 ICs and 2 connectors.
Main components
1README
README.mdECG Amplifier with a built-in Driven Right Leg circuit:
-
Powered by a 9-volt battery, reads ECG on human skin
-
3 probes needed, connected to their corresponding body parts: Right Arm, Left Arm, Right Leg
-
Disconnect any charging element from the laptop if using, e.g. MyDAQ, to read the signals. (I AM NOT RESPONSIBLE FOR ELECTRICAL SHOCK YOU EXPERIENCE T.T)
-
Circuit specificities:
- 5V regulator
- Instrumentation amplifier for DRL
- Instrumentation amp -> High-pass -> normal OpAmp -> Low-pass -> V_out => Total gain: 210 dB
- 7 ground sockets for plenty of circuit testing
- At least 100mV tolerance for half-cell potential differences (can be simulated with a DC current)
Note: Bodily resistance can be replaced with an equivalent circuit below for easier testing
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R4, R8, R13 |
| 5 | 1M | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R5, R6, R10, R11 |
| 3 | TLV6001DCK | Package_TO_SOT_SMD:SOT-23-5_HandSoldering | U1, U2, U3 |
| 2 | 0.1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C8, C9 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7, R9 |
| 2 | 4.7u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4, C5 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12 |
| 1 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C7 |
| 1 | 1n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C6 |
| 1 | 3.3u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | 320p | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3 |
| 1 | ADR421ARMZ | Package_SO:SOIC-8_5.3x6.2mm_P1.27mm | U5 |
| 1 | BD50GA3VEFJ | Package_SO:HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.4x3.2mm | U4 |
| 1 | Conn_01x03_Socket | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J1 |
| 1 | Conn_01x10_Socket | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J2 |
| 1 | INA326 | Package_SO:MSOP-8_3x3mm_P0.65mm | U7 |
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Questions
How big is the BackupECG2 PCB?
It measures 69.5 × 47 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BackupECG2 use?
30 parts, built around the ADR421ARMZ. 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 BackupECG2 KiCad files?
From the namtu06/ecg-amplifier repository on GitHub, at the commit this page was made from: the board is backupECG2.kicad_pcb and its schematic backupECG2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the BackupECG2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask namtu06 before reusing the design.