4 layers60 × 110 mm
4 layers60 × 100 mm
Comb
dchwebb/Comb2Eurorack comb filter oscillator
- Size
- 60 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 74
- Nets
- 97
- Pads
- 289
- Tracks, vias
- 415, 37
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 11 Jul 2025
- Updated
- 1 Aug 2025
Overview
Comb is an open-source printed circuit board by dchwebb, from the dchwebb/Comb repository on GitHub. It is a 4-layer board of 60 × 100 mm with 74 parts on 97 nets, routed with 415 tracks and 37 vias.
It is built around the MCP6004-E/P, TL072 and PCM5100APW, with the RCLAMP0502B among its other parts. Its parts include 26 capacitors, 24 resistors, 8 connectors, 5 ICs and 3 diodes. It belongs with the STM32 boards of this library.
Main components
4
MCP6004-E/P
PDIP-14-40℃~+125℃ 1.8V~6V 100uA 1MHz 1pA 1pA 23mA 28nV/√Hz@1kHz 2uV/℃ 4 4.5mV 600V/ms 76dB ESD protection Rail-to-Rail Input, Rail-to-Rail Output PDIP-14 Operational Amplifier ROHSMicrochip TechnologyOperational Amplifier
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
PCM5100APW
TSSOP-20-40℃~+130℃ 1.8V~3.3V 2 32 384kHz 50MHz Audio Decoder I2S TSSOP-20 ADCs/DACs - Special Purpose ROHSTexas InstrumentsADCs/DACs - Special Purpose
RCLAMP0502B
SOT-523-55℃~+125℃ 0.35pF、0.5pF 2 200nA 4A@8/20us 5V 6.8V 68W@8/20us 9V、15V ESD IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT-523 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
Parts
74| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C5, C8, C10, C13, C15, C17, C19, C27 |
| 6 | 1k | Resistor_SMD:R_0603_1608Metric | R1, R9, R21, R22, R23, R24 |
| 5 | TestPoint | Custom_Footprints:1.3mm_Test_Point | TP1, TP2, TP3, TP4, TP5 |
| 4 | 10k | Resistor_SMD:R_0603_1608Metric | R10, R11, R19, R20 |
| 4 | 2.7k | Resistor_SMD:R_0603_1608Metric | R5, R7, R15, R17 |
| 4 | 5.6k | Resistor_SMD:R_0603_1608Metric | R6, R8, R16, R18 |
| 3 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C4, C18, C26 |
| 2 | 100 | Resistor_SMD:R_0603_1608Metric | R4, R14 |
| 2 | 100pF | Capacitor_SMD:C_0603_1608Metric | C22, C24 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C3, C14 |
| 2 | 15k | Resistor_SMD:R_0603_1608Metric | R2, R12 |
| 2 | 1N5819 | Diode_SMD:D_SOD-123 | D1, D2 |
| 2 | 2.2nF | Capacitor_SMD:C_0603_1608Metric | C20, C23 |
| 2 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C11, C12 |
| 2 | 22uF | Capacitor_SMD:CP_Elec_4x5.8 | C9, C16 |
| 2 | 30pF | Capacitor_SMD:C_0603_1608Metric | C6, C7 |
| 2 | 47k | Resistor_SMD:R_0603_1608Metric | R3, R13 |
| 2 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J2, J4 |
| 2 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J1, J3 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C21 |
| 1 | 8MHz 20pF | Crystal:Crystal_SMD_Abracon_ABM3-2Pin_5.0x3.2mm | Y1 |
| 1 | Eurorack_10_pin_power | Custom_Footprints:Eurorack_16_pin_header | J5 |
| 1 | Jumper | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1 |
| 1 | L | Resistor_SMD:R_0805_2012Metric | L1 |
| 1 | LT1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | MCP6004 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U5 |
| 1 | PCM5100APW | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | RCLAMP0502B | Package_TO_SOT_SMD:SOT-416 | D3 |
| 1 | STM32U535RETx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U3 |
| 1 | SWD_Header | Custom_Footprints:SWD_header | J8 |
| 1 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4 |
| 1 | Test_Outs | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J9 |
| 1 | USB_B_Micro | Custom_Footprints:USB_Micro-B_Amphenol | J6 |
Questions
How big is the Comb PCB?
It measures 60 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Comb use?
74 parts, built around the MCP6004-E/P, TL072, PCM5100APW and RCLAMP0502B. 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 Comb KiCad files?
From the dchwebb/Comb repository on GitHub, at the commit this page was made from: the board is hardware/Comb.kicad_pcb and its schematic hardware/Comb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Comb design in my own project?
Its repository states no licence, so its author keeps all rights: ask dchwebb before reusing the design.
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