4 layers27.1 × 55.9 mm
OpenIEMA
aaravjhamb/openIEMA
A high quality open source In Ear Monitor Amplifier!! (IEMA for short)
56 parts7
4 layers72.4 × 69.8 mm
Wedge
aaravjhamb/wedgea v2 of aaravjhamb/openIEMA!! hijack sound like never before
- Size
- 72.4 × 69.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 117
- Nets
- 70
- Pads
- 352
- Tracks, vias
- 625, 76
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 25 Oct 2026
- Updated
- 25 Oct 2026
Overview
Wedge is an open-source printed circuit board by aaravjhamb, from the aaravjhamb/wedge repository on GitHub. It is a 4-layer board of 72.4 × 69.8 mm with 117 parts on 70 nets, routed with 625 tracks and 76 vias.
It is built around the 74LVC1G17Z, INA163UA and OPA1678ID, with the TPA6132A2RTE, LM393 and TPS60403DBV among its other parts. Its parts include 38 capacitors, 33 resistors, 13 diodes, 8 ICs and 6 connectors.
Main components
8
74LVC1G17Z
SOT-553-40℃~+125℃ 1 1 1.65V~5.5V 10uA 32mA 32mA 4.4ns@5V,15pF 74LVC Push-pull Schmitt trigger Unidirectional SOT-553 Buffers, Drivers, Receivers, Transceivers ROHSDiodes IncorporatedBuffers, Drivers, Receivers, Transceivers
INA163UA
SOIC-14-18V~-4.5V、4.5V~18V -40℃~+85℃ 0.1% 1 10mA 116dB 15V/us 1V/V~10000V/V 1nV/√Hz@1kHz 1uA 2uA 2us 3uV/℃ 500pA/℃ 50uV 60mA 800kHz External resistor gain SOIC-14 Instrumentation Amplifiers ROHSTexas InstrumentsInstrumentation Amplifiers
OPA1678ID
SOIC-8-150mil-18V~-2.25V、2.25V~18V -40℃~+85℃ 10pA 10pA 110dB 16MHz 2 2mA 2uV/℃ 4.5V~36V 4.5nV/√Hz@1kHz 500uV 50mA 9V/us Built-in compensation、ESD protection Rail-to-rail output SOIC-8-150mil Operational Amplifier ROHSTexas InstrumentsAudio Amplifiers
TPA6132A2RTE
WQFN-16-EP(3x3)-40℃~+85℃ 0.02% 100dB 100dB 2-Channel 2.1mA 2.3V~5.5V 25mWx2@16Ω Automatic mute/no-noise switch、Enable/shutdown function、Digitally programmable gain WQFN-16-EP(3x3) Audio Amplifiers ROHSTexas InstrumentsAudio Amplifiers
LM393
SOP-8-16V~16V 0℃~+70℃ 2 2.5mA 250nA 2V~36V 36V 5mV 5nA Fail-safe function Open-drain SOP-8 Comparators ROHSMSKSEMIComparators
TPS60403DBV
SOT-23-5-40℃~+125℃ -5.5V~-1.6V 1.8V~5.25V 15Ω 250kHz 425uA 60mA 90% Inverted Not supported SOT-23-5 Charge Pumps ROHSTexas InstrumentsCharge Pumps
BAV99
SOT-231 Pair Series Connection 1.25V@150mA 100V 215mA 250mW 4A 4ns 500nA@80V SOT-23 Switching Diodes ROHSNexperiaSwitching Diodes
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
README
README.mdOpenIEMA
OpenIEMA is an Open Source, In Ear Monitor Amplifier built as an alternative to the Behringer P2 with dual headphone outputs driven from a mono balanced XLR input, with onboard LiPo power and USB-C charging!!
Key Features
| True balanced input | Neutrik XLR into an OPA1678 differential line receiver which ensures any long cable runs from the mixer stay noise free |
| Dual 3.5mm outputs | supports up to two IEM users off one beltpack, driven by a TI TPA6132A2 DirectPath amp! |
| Analog soft limiter | anti parallel LEDs act as soft limiters that clamp excess noise before you hear it! |
| Fully portable | Uses a 1S LiPo with USB C charging (MCP73831, 500 mA) and a boost converter to a clean 5 V analog rail, charges while switched off |
| Zero firmware | 100% analog signal path built for simplicity |
| 3D-printed enclosure | Includes a 3D printed enclosure with volume control all in a compact package! |
PCB
40 × 70 mm, 2-layer, designed in KiCad 10.
Schematic:
Layout:
3D View:
Case
Designed in Fusion 360
Credits
This project uses:
- KiCad 10 for schematic capture and layout
- pcb2blender for the Blender renders
- TI TPA6132A2 + OPA1678, Microchip MCP73831, TI TPS61023
License
MIT
aaravj.tech [blocked] · GitHub @aaravjhamb
Parts
117| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9 |
| 6 | 100n | Capacitor_SMD:C_0603_1608Metric | C10, C15, C16, C23, C35, C36 |
| 5 | 10k | Resistor_SMD:R_0603_1608Metric | R7, R8, R12, R13, R26 |
| 5 | 1k | Resistor_SMD:R_0603_1608Metric | R4, R15, R27, R28, R33 |
| 4 | 100nF | Capacitor_SMD:C_0603_1608Metric | C24, C26, C32, C38 |
| 4 | 1uF | Capacitor_SMD:C_0603_1608Metric | C19, C20, C31, C37 |
| 4 | 47u | Capacitor_SMD:CP_Elec_6.3x7.7 | C11, C12, C29, C30 |
| 4 | BAV99 | Package_TO_SOT_SMD:SOT-23 | D2, D3, D9, D10 |
| 4 | LED | LED_SMD:LED_0805_2012Metric | D1, D4, D5, D6 |
| 3 | 100k | Resistor_SMD:R_0603_1608Metric | R6, R19, R29 |
| 3 | 10uF | Capacitor_SMD:C_0805_2012Metric | C22, C25, C27 |
| 3 | 1N4148W | Diode_SMD:D_SOD-123 | D7, D8, D12 |
| 3 | 4.7u | Capacitor_SMD:C_0603_1608Metric | C1, C2, C34 |
| 2 | 1.5k | Resistor_SMD:R_0603_1608Metric | R14, R17 |
| 2 | 100Ω | Resistor_SMD:R_0603_1608Metric | R18, R20 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric | C6, C14 |
| 2 | 1u | Capacitor_SMD:C_0603_1608Metric | C17, C18 |
| 2 | 2.2M | Resistor_SMD:R_0603_1608Metric | R30, R31 |
| 2 | 22u | Capacitor_SMD:C_0805_2012Metric | C4, C5 |
| 2 | 470pF | Capacitor_SMD:C_0603_1608Metric | C7, C8 |
| 2 | 47Ω | Resistor_SMD:R_0603_1608Metric | R9, R10 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | AudioJack4 | Connector_Audio:Jack_3.5mm_PJ320D_Horizontal | J4, J5 |
| 2 | FerriteBead | Resistor_SMD:R_0805_2012Metric | FB1, FB2 |
| 1 | 100 Ω | Resistor_SMD:R_0603_1608Metric | R22 |
| 1 | 100nf | Capacitor_SMD:C_0603_1608Metric | C13 |
| 1 | 10k pot | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | RV1 |
| 1 | 10kA pot | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | RV2 |
| 1 | 10nF | Capacitor_SMD:C_0603_1608Metric | C33 |
| 1 | 10u, ceramic | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 15k | Resistor_SMD:R_0603_1608Metric | R25 |
| 1 | 18Ω | Resistor_SMD:R_0603_1608Metric | R24 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R21 |
| 1 | 1nF | Capacitor_SMD:C_0603_1608Metric | C9 |
| 1 | 1uH | Inductor_SMD:L_Taiyo-Yuden_NR-40xx | L1 |
| 1 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C21 |
| 1 | 200Ω | Resistor_SMD:R_0603_1608Metric | R23 |
| 1 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | 2k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 4.7k | Resistor_SMD:R_0603_1608Metric | R16 |
| 1 | 470µF | Capacitor_SMD:CP_Elec_6.3x5.4 | C28 |
| 1 | 62Ω | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 68k | Resistor_SMD:R_0603_1608Metric | R32 |
| 1 | 732k | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 74LVC1G17 | Package_TO_SOT_SMD:SOT-23-5 | U7 |
| 1 | AMBERLED | LED_SMD:LED_0805_2012Metric | D13 |
| 1 | Battery | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J1 |
| 1 | G6K-2 | Relay_SMD:Relay_DPDT_Omron_G6K-2F-Y | K1 |
| 1 | INA163UA | easyeda2kicad:SOIC-14_L8.7-W3.9-P1.27-LS6.0-BL | U6 |
| 1 | LM393 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | MCP73831-2-MC | Package_DFN_QFN:DFN-8-1EP_3x2mm_P0.5mm_EP1.7x1.4mm | U1 |
| 1 | Neutrik NC3MD-H | Connector_Audio:Jack_XLR_Neutrik_NC3MAAH_Horizontal | J6 |
| 1 | OPA1678 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | REDLED | LED_SMD:LED_0805_2012Metric | D11 |
| 1 | SW_SP3T | Wedge:SW_SP3T_G-Switch_SK-13D01-G030 | SW3 |
| 1 | SW_SPDT | Button_Switch_SMD:SW_SPDT_PCM12 | SW2 |
| 1 | SW_SPST | Button_Switch_SMD:SW_SPDT_PCM12 | SW1 |
| 1 | TPA6132A2RTE | Package_DFN_QFN:WQFN-16-1EP_3x3mm_P0.5mm_EP1.6x1.6mm_ThermalVias | U4 |
| 1 | TPS60403DBV | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | TPS61023DRLR | Package_TO_SOT_SMD:SOT-563 | U2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-17 | J3 |
| 1 | XLR3 | Connector_Audio:Jack_XLR_Neutrik_NC3FAAH_Horizontal | J2 |
Questions
How big is the Wedge PCB?
It measures 72.4 × 69.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Wedge use?
117 parts, built around the 74LVC1G17Z, INA163UA, OPA1678ID and TPA6132A2RTE. 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 Wedge KiCad files?
From the aaravjhamb/wedge repository on GitHub, at the commit this page was made from: the board is PCB/Wedge.kicad_pcb and its schematic PCB/Wedge.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Wedge design in my own project?
Its repository states no licence, so its author keeps all rights: ask aaravjhamb before reusing the design.
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