4 layers172 × 140.5 mm
4 layers194 × 94 mm
Bottom board
mod-audio/hw-mod-dwarf6Hardware project of MOD Dwarf
- Size
- 194 × 94 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 319
- Nets
- 342
- Pads
- 1,092
- Tracks, vias
- 4,194, 343
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 15 Dec 2019
- Updated
- 3 Nov 2026
Overview
Bottom board is an open-source printed circuit board by mod-audio, from the mod-audio/hw-mod-dwarf repository on GitHub. It is a 4-layer board of 194 × 94 mm with 319 parts on 342 nets, routed with 4,194 tracks and 343 vias.
It is built around the ISL83491IBZ, OPA1678IDRGR and CS4265-CNZ, with the LM4562NA, LM4811MM and TS2596CM5 among its other parts. Its parts include 112 capacitors, 112 resistors, 22 diodes, 14 ICs and 14 connectors.
Main components
12
ISL83491IBZ
SOIC-14-40℃~+85℃ 1 1 10Mbps 3V~3.6V Transceiver SOIC-14 RS-485 / RS-422 ICs ROHSRenesas ElectronicsRS-485/RS-422 ICs
OPA1678IDRGR
WSON-8-EP(3x3)-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 WSON-8-EP(3x3) Operational Amplifier ROHSTexas InstrumentsAudio AmplifiersCS4265-CNZ
QFN-32(5x5)-10℃~+70℃ 3.13V~5.25V、3.13V~5.25V 4kHz~192kHz Encoder/decoder On-chip digital gain、Mute control、Master-slave clock negotiation Serial QFN-32(5x5) Audio Interface ICs ROHSCirrus LogicAudio Interface ICs
LM4562NA
PDIP-8-17V~-2.5V、2.5V~17V -40℃~+85℃ 0.00003% 10mA 120dB 2-Channel PDIP-8 Audio Amplifiers ROHSTexas InstrumentsAudio Amplifiers
LM4811MM
VSSOP-10-0.5mm-40℃~+85℃ 0.1% 1.3mA 105mWx1@16Ω、70mWx1@32Ω 2-Channel 2V~5.5V 60dB Automatic mute/no-noise switch、Enable/shutdown function、Digitally programmable gain VSSOP-10-0.5mm Audio Amplifiers ROHSTexas InstrumentsAudio AmplifiersTS2596CM5
TO-263-5-40℃~+125℃ 127kHz~173kHz 4.5V~40V Buck Buck No TO-263-5 DC-DC Converters ROHSTaiwan SemiconductorDC-DC Converters
6N137S
SOP-8-40℃~+85℃ 1 1.8V 100mW 10Mbps 10kV/us 2.5kV 4.5V~5.5V 50mA 5V 5mA 75ns 75ns DC SOP-8 Logic Output Optoisolators ROHSUMWLogic Output Optoisolators
AP2120N-3.3TRG1
SOT-23-40℃~+85℃@(Tj) 1 150mA 200mV@(100mA) 25uA 3.3V 30uVrms 65dB@(1kHz) 6V Fixed Over Current Protection Positive SOT-23 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
AT24CS08-STUM-T
SOT-23-5-40℃~+85℃ 1,000,000 cycles 1.7V~5.5V 100 Years 1MHz 5ms 8Kbit Hardware write protection function、Noise suppression function、Built-in power-on reset (POR) I2C SOT-23-5 EEPROM ROHSMicrochip TechnologyEEPROM
LD1117S50TR(MS)
SOT-223-20℃~+125℃@(Ta) 1 1.4V@(1A) 12V 1A 2mA 4.9V~5.1V Fixed Positive Thermal Shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TL750M10CKVURG3
TO-2520℃~+125℃@(Tj) 1 1000uV 10V 26V 55dB@(120Hz) 600mV@(750mA) 750mA Fixed Over Current Protection、Over Temperature Protection、Over Voltage Protection Positive TO-252 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsTPS2001DDBVR-TP
SOT-23-5-40℃~+125℃ 1 2.5V~5.5V 2A 70mΩ Active High、Active Low High Side Switch Short-Circuit Protection(SCP)、Undervoltage Protection(UVP)、Overcurrent Protection(OCP)、Over Temperature Protection SOT-23-5 Power Distribution Switches ROHSTECH PUBLICPower Distribution Switches
README
README.mdhw-mod-dwarf
This repository contains the schematics and PCB design files for the MOD Dwarf hardware.
main-board/: main board, designed with KiCad. It should work with the latest revision of the KiCad libraries and footprints available at https://github.com/KiCad/controller-board/: controller board, designed with Altium Designer (sources, Gerbers, BOM, PDF schematic).enclosure/: exterior 3D model of the Dwarf (STEP), for designing cases, stands and other accessories. Seeenclosure/README.md.LIB/,Documantation/: part libraries, mechanical drawings and component documentation.
License
Copyright (c) 2019-2026 MOD Audio Limited.
- Hardware design files (schematics, PCB layouts, fabrication files, BOMs): licensed under
CC BY-NC-SA 4.0 (see
LICENSE). You may study, modify, repair and build them for yourself, and share your changes under the same licence. You may not use them commercially, for example to make or sell boards or devices. - Enclosure model (
enclosure/): licensed under CC BY 4.0 (seeenclosure/LICENSE). You can make and sell accessories based on it. - Third-party files (manufacturer component models, symbols and footprints, Firefly module documentation) are
not covered by these licences. See
NOTICEfor the list.
The MOD logo is a registered trademark (EU trade mark no. 016228827; UK trade mark no. UK00916228827).
The licences above give no right to use the MOD name or logo. See NOTICE.
For commercial licensing, contact MOD Audio.
Parts
319| Qty | Value | Footprint | References |
|---|---|---|---|
| 45 | 100nF | Capacitor_SMD:C_0603_1608Metric | C10, C11, C12, C13, C14, C17, C19, C22, C31, C35, C36, C100, C102, C104, C106, C109 +29 |
| 24 | 10K | Resistor_SMD:R_0603_1608Metric | R19, R21, R42, R46, R51, R52, R57, R58, R64, R66, R73, R74, R75, R76, R77, R78 +8 |
| 14 | 10uF | Capacitor_SMD:C_0805_2012Metric | C8, C20, C25, C37, C41, C45, C49, C67, C69, C76, C78, C80, C96, C110 |
| 14 | 1M | Resistor_SMD:R_0603_1608Metric | R16, R23, R24, R27, R28, R29, R31, R40, R44, R48, R90, R91, R110, R111 |
| 12 | 100pF | Capacitor_SMD:C_0603_1608Metric | C21, C23, C28, C29, C40, C44, C46, C47, C55, C56, C90, C91 |
| 11 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D3, D4, D10, D11, D12, D17, D18, D19, D20, D21, D22 |
| 10 | 10uF | Capacitor_SMD:CP_Elec_4x5.7 | C2, C33, C34, C61, C63, C64, C65, C66, C88, C89 |
| 9 | 22R | Resistor_SMD:R_0603_1608Metric | R3, R4, R5, R6, R7, R9, R10, R94, R95 |
| 9 | 2K7 | Resistor_SMD:R_0603_1608Metric | R1, R2, R11, R20, R22, R65, R67, R68, R69 |
| 8 | 100K | Resistor_SMD:R_0603_1608Metric | R14, R15, R25, R26, R53, R54, R88, R89 |
| 8 | 100R | Resistor_SMD:R_0603_1608Metric | R8, R12, R13, R41, R45, R55, R56, R63 |
| 8 | 150R | Resistor_SMD:R_0603_1608Metric | R86, R87, R102, R105, R106, R107, R108, R109 |
| 7 | 47uF | Capacitor_SMD:CP_Elec_5x5.4 | C18, C42, C57, C72, C74, C83, C84 |
| 7 | Ferrite_Bead | Resistor_SMD:R_0603_1608Metric | FB1, FB2, FB3, FB12, FB13, FB14, FB15 |
| 6 | 1N4148 | Diode_SMD:D_SOD-323_HandSoldering | D5, D6, D8, D9, D15, D16 |
| 6 | 1uF | Capacitor_SMD:C_0603_1608Metric | C24, C26, C27, C97, C103, C105 |
| 6 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q7, Q8, Q12, Q13 |
| 6 | MMBFJ211 | Package_TO_SOT_SMD:SOT-23 | Q3, Q4, Q5, Q6, Q9, Q10 |
| 5 | 1K | Resistor_SMD:R_0603_1608Metric | R70, R71, R99, R100, R101 |
| 4 | 1nF | Capacitor_SMD:C_0603_1608Metric | C4, C92, C93, C108 |
| 4 | 22uF | Capacitor_SMD:C_0805_2012Metric | C30, C58, C99, C101 |
| 4 | 4K7 | Resistor_SMD:R_0603_1608Metric | R36, R37, R38, R39 |
| 4 | 56R | Resistor_SMD:R_0603_1608Metric | R59, R60, R61, R62 |
| 4 | HOLE | Uno:Hole_3.5mm | H1, H2, H3, H4 |
| 4 | JACK_TRS_6PINS | Connector_Audio:Jack_3.5mm_Neutrik_NMJ6HCD2_Horizontal | P9, P10, P11, P12 |
| 4 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP3, TP4, TP5, TP6 |
| 3 | 100uF | Capacitor_SMD:CP_Elec_6.3x7.7 | C1, C70, C71 |
| 3 | 220R | Resistor_SMD:R_0603_1608Metric | R47, R49, R50 |
| 3 | AudioJack3 | Connector_Audio:Jack_3.5mm_CUI_SJ-3523-SMT_Horizontal | P6, P7, P14 |
| 3 | FIDUCIAL | Uno:fiducial_in-circuit | FID1, FID2, FID3 |
| 3 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H5, H6, H7 |
| 2 | 1000uF | Capacitor_SMD:CP_Elec_10x10.5 | C3, C107 |
| 2 | 1uF | Capacitor_SMD:C_1210_3225Metric | C111, C112 |
| 2 | 2.2nF | Capacitor_SMD:C_0603_1608Metric | C15, C16 |
| 2 | 22K | Resistor_SMD:R_0603_1608Metric | R34, R35 |
| 2 | 47R | Resistor_SMD:R_0603_1608Metric | R17, R18 |
| 2 | 56K | Resistor_SMD:R_0603_1608Metric | R92, R93 |
| 2 | 5K6 | Resistor_SMD:R_0603_1608Metric | R32, R33 |
| 2 | 6R8 | Resistor_SMD:R_0603_1608Metric | R103, R104 |
| 2 | 75K | Resistor_SMD:R_0603_1608Metric | R96, R97 |
| 2 | OPA1678IDR | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U6, U7 |
| 2 | PRTR5V0U2X | Package_TO_SOT_SMD:SOT-143 | D13, D14 |
| 2 | RSX205LAM30TR | Diode_SMD:D_SOD-128 | D1, D2 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | TP7, TP8 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | Power1, Reset1 |
| 2 | TestPoint | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP1, TP2 |
| 1 | 0R | Resistor_SMD:R_0603_1608Metric | R72 |
| 1 | 10R | Resistor_SMD:R_0603_1608Metric | R30 |
| 1 | 15K | Resistor_SMD:R_0603_1608Metric | R43 |
| 1 | 1K5 | Resistor_SMD:R_0603_1608Metric | R112 |
| 1 | 1mH | Inductor_SMD:L_Bourns_SRR1260 | L1 |
| 1 | 24.576MHz | Oscillator:Oscillator_SMD_Abracon_ASV-4Pin_7.0x5.1mm | X1 |
| 1 | 470uF | Capacitor_SMD:CP_Elec_8x10.5 | C32 |
| 1 | 47UH 2A 135 MOHM | Uno:SRN8040TA | L2 |
| 1 | 6N137S | Uno:6N137S | U11 |
| 1 | AP2120N-3.3 | Package_TO_SOT_SMD:SOT-23 | U13 |
| 1 | AS0A823-H4SB-7H | Uno:TE_2309409-1 | J1 |
| 1 | AT24CS08-STUM | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | BARREL_JACK | Connector_BarrelJack:BarrelJack_Horizontal | P3 |
| 1 | CS4265 | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm | U3 |
| 1 | Conn_01x25 | F51L-1A7H1-11024:F51L-1A7H1-11024 | J2 |
| 1 | FUSE | Fuse:Fuse_2920_7451Metric | F1 |
| 1 | ISL83491 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U12 |
| 1 | Jumper | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP1 |
| 1 | LD1117S50TR | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U9 |
| 1 | LM4562 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | LM4811 | Package_SO:TSSOP-10_3x3mm_P0.5mm | U8 |
| 1 | LM833DR2G | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U14 |
| 1 | Logo | footprints:mod-logo | IMG1 |
| 1 | RJ45 | digikey-footprints:Ethernet_Jack_54602-908LF | P13 |
| 1 | SERIAL_DEBUG | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | P8 |
| 1 | TL750M10CKVURG3 | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U2 |
| 1 | TPS2001DDBVR | Package_TO_SOT_SMD:SOT-23-5 | U10 |
| 1 | TS2596 | Package_TO_SOT_SMD:TO-263-5_TabPin3 | U1 |
| 1 | TSSA3U45 R3G | Diode_SMD:D_MELF | D7 |
| 1 | USB_A | Uno:USB_A_Vertical | P2 |
| 1 | USB_B | Connector_USB:USB_B_OST_USB-B1HSxx_Horizontal | P1 |
Questions
How big is the Bottom board PCB?
It measures 194 × 94 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Bottom board use?
319 parts, built around the ISL83491IBZ, OPA1678IDRGR, CS4265-CNZ and LM4562NA. 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 Bottom board KiCad files?
From the mod-audio/hw-mod-dwarf repository on GitHub, at the commit this page was made from: the board is main-board/PCB Source/bottom-board/bottom-board.kicad_pcb and its schematic main-board/PCB Source/bottom-board/Headphone.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bottom board design in my own project?
Its repository states no licence, so its author keeps all rights: ask mod-audio before reusing the design.
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