2 layers67.7 × 49.8 mm
2 layers138 × 70 mm
BioPotAmp.v2
apn14/Bio_Potential_Amplifier_ISIndependent Study Taken with Dr. Aaron Kyle where I designed, tested and made a multimodal biopotential amplifier.
- Size
- 138 × 70 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 79
- Nets
- 63
- Pads
- 196
- Tracks, vias
- 225, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 May 2026
- Updated
- 1 May 2026
Overview
BioPotAmp.v2 is an open-source printed circuit board by apn14, from the apn14/Bio_Potential_Amplifier_IS repository on GitHub. It is a 2-layer board of 138 × 70 mm with 79 parts on 63 nets, routed with 225 tracks and 0 vias.
It is built around the AD8221ARZ and OP249GSZ. Its parts include 28 capacitors, 22 resistors, 20 connectors and 5 ICs. It belongs with the audio and music boards of this library.
Main components
2
AD8221ARZ
SOIC-8-18V~-2.3V、2.3V~18V -40℃~+125℃ 0.03% 1 10us 18mA 1V/V~1000V/V 1mA 1pA/℃ 200pA 2V/us 400nV/℃ 500pA 60uV 80dB 825kHz 8nV/√Hz@1kHz 90dB External resistor gain、EMI filtering/RF suppression SOIC-8 Instrumentation Amplifiers ROHSAnalog DevicesInstrumentation AmplifiersOP249GSZ
SOIC-8-18V~18V -40℃~+85℃ 17nV/√Hz@1kHz 2 2.2uV/℃ 22V/us 25pA 36mA 4.7MHz 400uV 40pA 5.6mA 90dB High capacitive load driving SOIC-8 FET Input Amplifiers ROHSAnalog DevicesFET InputAmplifiers
README
README.mdBio-Potential Amplifier Independent Study
This repository contains the KiCad design files, LTspice simulations, component library assets, and project documentation for a bio-potential amplifier independent study project.
Repository layout
kicad/BioPotAmp/- original KiCad project files.kicad/BioPotAmp_v2/- current KiCad project files, board export, design rules, and KiCad cache files that were already tracked.kicad/auxiliary/- standalone auxiliary KiCad schematics.libraries/AD8221ARZ/- imported AD8221ARZ symbol, footprint, STEP model, and vendor import notes.simulations/ltspice/- LTspice schematics, plot settings, logs, raw outputs, and exported analysis data.docs/- project documentation and proposal material.
Opening the design
Open kicad/BioPotAmp_v2/BioPotAmp.v2.kicad_pro in KiCad for the current board design.
Notes
Large LTspice output files are currently tracked because they were part of the original upload. Future generated simulator outputs and KiCad caches are ignored by .gitignore unless explicitly added.
Parts
79| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | C_Small_US | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23 +12 |
| 5 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12, R14, R15, R16, R24 |
| 4 | 33k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R11, R19, R20 |
| 4 | MountingHole | MountingHole:MountingHole_2.1mm | H1, H2, H3, H4 |
| 4 | OP249GS | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2, U3, U4, U5 |
| 3 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R8, R9 |
| 3 | Conn_01x01_Socket | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J39, J40, J41 |
| 2 | 159k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R3 |
| 2 | 56k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R10 |
| 1 | +9V_con | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J12 |
| 1 | -9V_con | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J11 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R21 |
| 1 | 200k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13 |
| 1 | 20k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R22 |
| 1 | 400k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R23 |
| 1 | 9V_Pot_Lead | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J43 |
| 1 | AD8221ARZ | Button_Switch_SMD:SOIC127P600X175-8N | U1 |
| 1 | Conn_Coaxial | Connector_Coaxial:BNC_TEConnectivity_1478035_Horizontal | J10 |
| 1 | GND_con | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J13 |
| 1 | INA_Gain_R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | RSW_IN_1 | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J8 |
| 1 | RSW_IN_2 | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J3 |
| 1 | RSW_IN_3 | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J4 |
| 1 | RSW_IN_4 | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J5 |
| 1 | RSW_IN_5 | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J6 |
| 1 | Rotary_sw_1_out | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J45 |
| 1 | Rotary_sw_2_out | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J1 |
| 1 | Rotary_sw_3_out | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J2 |
| 1 | Rotary_sw_4_out | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J7 |
| 1 | Rotary_sw_5_out | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J9 |
| 1 | U4_pot_lead | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J42 |
| 1 | gnd_pot | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J44 |
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Questions
How big is the BioPotAmp.v2 PCB?
It measures 138 × 70 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BioPotAmp.v2 use?
79 parts, built around the AD8221ARZ and OP249GSZ. 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 BioPotAmp.v2 KiCad files?
From the apn14/Bio_Potential_Amplifier_IS repository on GitHub, at the commit this page was made from: the board is kicad/BioPotAmp_v2/BioPotAmp.v2.kicad_pcb and its schematic kicad/BioPotAmp/BioPotAmp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the BioPotAmp.v2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask apn14 before reusing the design.