SCMD/schematicSCMD-2 schematic and PCB layout
SCMD2 is an open-source printed circuit board by SCMD, from the SCMD/schematic repository on GitHub. It is a 2-layer board of 86.9 × 68.1 mm with 71 parts on 43 nets, routed with 458 tracks and 29 vias.
It is built around the FT232RL, TLE2426ID and 1N4734A, with the LM385-1.2 among its other parts. Its parts include 23 capacitors, 17 resistors, 9 ICs, 8 diodes and 4 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
SCMD-2 design source, schematic and PCB layout.
PDF exports of the schematics, layout and BOM are located in export directory. Deisgn files are located in the root directiry of the repo. To access the design files you need KiCAD installed.
Make sure that PCU meets EN60601-1 and EN55011 Class B (approved for medical use). We use widely available Cincon TR30RAM180.
For firmware used with this project navigate here.
Copyright (C) 2014, Centre for Decision Research and Experimental Economics (CeDEx), the University of Nottingham.
This documentation describes Open Hardware and is licensed under the CERN OHL v. 1.2. You may redistribute and modify this documentation under the terms of the CERN OHL v.1.2. (http://ohwr.org/cernohl). This documentation is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE. Please see the CERN OHL v.1.2 for applicable conditions
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 0.1uF | C2 | C5, C6, C8, C9, C13, C14, C16, C17 |
| 5 | 0.1uF | SM0603_Capa | C1, C19, C20, C21, C23 |
| 5 | 100R | R3 | R5, R6, R11, R15, R16 |
| 5 | OP177 | DIP-8__300 | U1, U2, U5, U6, U7 |
| 4 | 1.5uF | C2 | C4, C7, C12, C15 |
| 4 | 100k | R3 | R2, R3, R13, R14 |
| 4 | 1N4734A | D3 | D4, D5, D7, D8 |
| 4 | P*** | 1pin | 1PIN, 1PIN, 1PIN, 1PIN |
| 2 | 10k | SM0603 | R1, R17 |
| 2 | 22pF | SM0603_Capa | C2, C10 |
| 2 | 330R | R3 | R7, R8 |
| 1 | 100uH | Neosid_Inductor_SM-NE56_SMD2220_RevA_21Apr2012 | L1 |
| 1 | 10nF | SM0603_Capa | C18 |
| 1 | 10uF | c_elec_4x5.3 | C22 |
| 1 | 10uF | C1 | C11 |
| 1 | 15k | R3 | R10 |
| 1 | 16MHz | HC-49V | X1 |
| 1 | 1N4001 | D3 | D2 |
| 1 | 1n4148 | SOD-123 | D1 |
| 1 | 200R | R3 | R9 |
| 1 | 20k | RV2 | RV1 |
| 1 | 220uF | C1 | C3 |
| 1 | 2N3904 | TO92-INVERT | Q1 |
| 1 | 3k9 | R3 | R12 |
| 1 | 47k | R3 | R4 |
| 1 | ATMEGA8-P | DIP-28__300 | IC1 |
| 1 | FT232RL | SSOP28 | U8 |
| 1 | ICSP | pin_array_3x2_ICSP | J2 |
| 1 | LED | double_led | D3 |
| 1 | LM385-1.2 | TO92 | D6 |
| 1 | MINIUSB | USB_MINI_B_fixed | J4 |
| 1 | PWR JACK | BARREL_JACK | J1 |
| 1 | SKIN_EL | pin_array_4x2_SKIN_EL | J3 |
| 1 | SW_GENERIC | SW_M7RE | SW1 |
| 1 | SW_PUSH | pushbutton_side | SW2 |
| 1 | TL431LP | TO92-INVERT | U4 |
| 1 | TLE2426 | TO92 | U3 |
It measures 86.9 × 68.1 mm and has 2 copper layers, 1.6 mm thick.
71 parts, built around the FT232RL, TLE2426ID, 1N4734A and LM385-1.2. 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.
From the SCMD/schematic repository on GitHub, at the commit this page was made from: the board is SCMD2.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask SCMD before reusing the design.
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