Bottom board
About the Bottom board
Bottom board is an open source PCB design by mod-audio, published on GitHub. It is a 2-layer board measuring 172 × 140.5 mm, with 252 components from 75 distinct parts.
Other key parts include the MURATA 5V, LD1117S50TR_SOT223, CS4245, AT24CS08-STUM and LM4562. By type, the board carries 62 capacitors, 57 resistors, 16 connectors, 16 diodes, 14 transistors and 12 ICs.
From the project
Hardware project of MOD Duo
This repository contains the schematics and PCB design files for the MOD Duo hardware (http://moddevices.com/).
These files were created and can be improved with KiCAD, a free software Electronics CAD which is available at http://www.kicad.org/
This project should work with last revision of KiCad libraries and footprints available at https://github.com/KiCad/
Main components on the Bottom board
Bottom board bill of materials (BOM)
252 components, 75 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MURATA 5V | OKI-78SR_Vertical | U1 |
| 1 | LD1117S50TR_SOT223 | SOT-223-3_TabPin2 | U2 |
| 1 | CS4245 | LQFP-48_7x7mm_P0.5mm | U3 |
| 1 | AT24CS08-STUM | SOT-23-5 | U4 |
| 3 | LM4562 | SOIC-8_3.9x4.9mm_P1.27mm | U6, U7, U8 |
| 1 | LM4811 | MSOP-10_3x3mm_Pitch0.5mm | U9 |
| 1 | RT9742MNGJ5 | SOT-23-5 | U10 |
| 1 | 6N137S | DIP-8_SMD | U11 |
| 1 | ISL83491 | SOIC-14_3.9x8.7mm_P1.27mm | U12 |
| 1 | AP2120N-3.3 | SOT-23 | U13 |
| 8 | 2N7002 | SOT-23 | Q1, Q2, Q7, Q8, Q9, Q10, Q12, Q13 |
| 4 | J112 | SOT-23 | Q3, Q4, Q5, Q6 |
| 2 | BSS84 | SOT-23 | Q14, Q15 |
| 5 | JACK_TRS_6PINS | Jack_3.5mm_Neutrik_NMJ6HCD2_Horizontal | J1, J2, J3, J4, J5 |
| 1 | RJ45_LEDS | RJ45_Amphenol_RJHSE538X | J6 |
| 2 | Conn_02x50_Odd_Even | Pin_Header_Straight_2x50_Pitch1.27mm_SMD | J7, J8 |
| 1 | USB_B | USB_B_OST_USB-B1HSxx_Horizontal | P1 |
| 1 | USB_A | USB_A_Vertical | P2 |
| 2 | DIN_5 | SDS-50J | P3, P4 |
| 1 | BARREL_JACK | BarrelJack_Horizontal | P5 |
Show 55 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | HMI_POWER | B2B-XH-A | P6 |
| 1 | HMI_DATA | Pin_Header_Straight_2x10_Shrouded | P8 |
| 1 | SERIAL_DEBUG | PinHeader_1x03_P2.54mm_Vertical | P9 |
| 2 | 2.2nF | C_0603_1608Metric | CA1, CA2 |
| 4 | 100pF | C_0603_1608Metric | CA3, CA4, CA7, CA8 |
| 2 | 100nF | C_1206_3216Metric | CA5, CA6 |
| 7 | 10uF | CP_Elec_5x5.3 | CA9, CA10, CA11, CA12, CA17, CA18, CA23 |
| 2 | 33pF | C_0603_1608Metric | CA13, CA14 |
| 2 | 47pF | C_0603_1608Metric | CA15, CA16 |
| 4 | 100uF | CP_Elec_6.3x7.7 | CA19, CA20, CA24, CA25 |
| 1 | FUSE | Fuse_SMD2920 | F1 |
| 5 | HOLE | Hole_3.5mm | H1, H2, H3, H4, H5 |
| 1 | 0R | Jumper_SMD_THT | JMP1 |
| 2 | IM06TS | Relay_DPDT_Omron_G6S-2F-good_pinout | K1, K2 |
| 2 | 47R | R_0603_1608Metric | RA1, RA2 |
| 4 | 1M | R_0603_1608Metric | RA3, RA4, RA5, RA6 |
| 4 | 1k5 | R_0603_1608Metric | RA7, RA8, RA11, RA12 |
| 2 | 21k | R_0603_1608Metric | RA9, RA10 |
| 2 | 4k99 | R_0603_1608Metric | RA13, RA14 |
| 2 | 100R | R_0603_1608Metric | RA15, RA16 |
| 4 | 1k2 | R_0603_1608Metric | RA17, RA18, RA19, RA20 |
| 8 | 10k | R_0603_1608Metric | RA21, RA22, RA25, RA26, RA27, RA28, RA29, RA30 |
| 2 | 15k | R_0603_1608Metric | RA23, RA24 |
| 2 | 22k | R_0603_1608Metric | RA31, RA33 |
| 4 | 33R | R_0603_1608Metric | RA32, RA34, RA36, RA38 |
| 2 | 66R | R_0603_1608Metric | RA35, RA37 |
| 2 | 75k | R_0603_1608Metric | RA39, RA40 |
| 1 | SW_PUSH | SW_Tactile_SPST_Angled | SW1 |
| 2 | MBR230 | D_SOD-123F | D1, D2 |
| 4 | BAS70-04 | SOT-23 | D3, D4, D7, D8 |
| 6 | 1N4148 | D_SOD-323 | D5, D6, D9, D10, D11, D12 |
| 2 | PRTR5V0U2X | SOT-143 | D13, D14 |
| 2 | 1N4148 | SOD-323 | D15, D16 |
| 1 | 1mH | SELF-WE-PD-XXL | FB1 |
| 1 | 600R 1.5A | C_0805_2012Metric | L1 |
| 23 | 100nF | C_0603_1608Metric | C1, C4, C5, C9, C10, C31, C33, C35 +15 |
| 2 | 2200uF | C_Radial_D10_L20_P5 | C2, C6 |
| 11 | 10uF | C_0805_2012Metric | C3, C7, C8, C11, C15, C18, C19, C25 +3 |
| 3 | 1uF | C_0805_2012Metric | C12, C20, C24 |
| 9 | 100nF | C_0402_1005Metric | C13, C14, C16, C17, C21, C22, C26, C28 +1 |
| 2 | 10uF | CP_Elec_6.3x5.3 | C23, C62 |
| 2 | 47uF | CP_Elec_6.3x5.3 | C27, C29 |
| 8 | 10uF | CP_Elec_5x5.3 | C32, C34, C36, C40, C41, C46, C56, C61 |
| 2 | 100uF | CP_Elec_6.3x5.3 | C38, C39 |
| 21 | 10k | R_0603_1608Metric | R1, R2, R12, R13, R14, R17, R20, R21 +13 |
| 9 | 22R | R_0603_1608Metric | R3, R4, R5, R6, R7, R9, R10, R40 +1 |
| 2 | 2k7 | R_0603_1608Metric | R15, R16 |
| 6 | 100k | R_0603_1608Metric | R22, R23, R28, R29, R34, R35 |
| 4 | 1M | R_0603_1608Metric | R24, R25, R26, R27 |
| 1 | 5k6 | R_0603_1608Metric | R42 |
| 3 | 220R | R_0805_2012Metric | R47, R49, R50 |
| 4 | 100R | R_0603_1608Metric | R55, R56, R72, R73 |
| 4 | 56R | R_0805_2012Metric | R59, R60, R61, R62 |
| 1 | 100R | R_0805_2012Metric | R63 |
| 2 | 330R | R_0603_1608Metric | R76, R77 |
Bottom board design files
The KiCad project lives in the mod-audio/mod-hw-duo repository on GitHub; these links point at the commit this page was built from.
Bottom board: common questions
How big is the Bottom board?
The Bottom board measures 172 × 140.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Bottom board?
252 components, from 75 distinct parts. The full bill of materials is listed on this page.
Where can I download the Bottom board design files?
From the mod-audio/mod-hw-duo repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Bottom board design in my own project?
The repository has no license, so all rights stay with mod-audio. Use it as a reference, and ask the author before reusing the design.
