2 layers20.3 × 128.3 mm
Expander just front
plinkysynth/plinky-expander
hardware design of a small expander for the plinky synth
12 parts19
2 layers20.3 × 104.3 mm
Expander just back
plinkysynth/plinky-expander19hardware design of a small expander for the plinky synth
- Size
- 20.3 × 104.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 57
- Pads
- 204
- Tracks, vias
- 574, 55
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 9 Mar 2021
- Updated
- 14 May 2021
Overview
Expander just back is an open-source printed circuit board by plinkysynth, from the plinkysynth/plinky-expander repository on GitHub. It is a 2-layer board of 20.3 × 104.3 mm with 62 parts on 57 nets, routed with 574 tracks and 55 vias.
It is built around the SN74LVC1G17DBV, TL072 and DAC7554IDGS, with the HCPL-0631 among its other parts. Its parts include 29 resistors, 12 capacitors, 10 connectors and 8 ICs.
Main components
4
SN74LVC1G17DBV
SOT-23-5-40℃~+125℃ 1 1 1.65V~5.5V 10uA 32mA 32mA 4.6ns@3.3V,15pF 74LVC Power-off isolation、Level shifting Push-pull Schmitt trigger Unidirectional SOT-23-5 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffer/Driver/Transceiver
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
DAC7554IDGS
VSSOP-10-40℃~+105℃ 0.35LSB 12 2.7V~5.5V 200nA 4 5us Power-on reset、Power-down mode SPI Voltage Buffer VSSOP-10 Digital to Analog Converters (DAC) ROHSTexas InstrumentsDigital To Analog Converters (DACs)
HCPL-0631
SOT-ALL-8-40℃~+85℃ 1.5V 15kV/us 2 3.75kV 4.5V~5.5V 5mA 75ns 75ns DC Output enable control、Open-collector output SOT-ALL-8 Logic Output OptoisolatorsBroadcom LimitedLogic Output Optoisolators
README
README.mdplinky-expander
hardware design of a small expander for the plinky synth
if you want to get some of these made, I recommend the gerbers in the folders gerbers_just_front (the front panels, no SMT assembly required) and gerbers_just_back (one sided SMT assembly required, JLCPCB compatible subject to stock) the BOM files for the SMT assembly are in the main folder, and then the hardware BOM file is the set of thruhole parts you will need to order to assemble. in summary:
- get black PCB only boards using the gerber zip file in gerbers_just_front
- get any-color PCB boards with SMT assembly using gerber zip and placement file in gerbers_just_back, and using the BOM in jlcbom.csv
- order thruhole components as listed in hardware-bom.csv
once all the parts arrive, you can put it all together. build guide is on plinkysynth.com
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 10k | Resistor_SMD:R_0603_1608Metric | R4, R13, R14, R15, R16, R25, R26, R27, R28 |
| 9 | 220R | Resistor_SMD:R_0603_1608Metric | R2, R3, R6, R9, R21, R22, R23, R24, R29 |
| 8 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C3, C4, C5, C6, C7, C8, C9 |
| 5 | 10R | Resistor_SMD:R_0603_1608Metric | R7, R8, R10, R11, R12 |
| 4 | 10n | Capacitor_SMD:C_0603_1608Metric | C10, C11, C12, C13 |
| 4 | 56k | Resistor_SMD:R_0603_1608Metric | R17, R18, R19, R20 |
| 4 | AudioJack3 | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J5, J6, J7, J8 |
| 4 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5, U6, U7, U8 |
| 3 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1, JP2, JP3 |
| 2 | AudioJack2_SwitchT | Connector_Audio:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J2, J3 |
| 1 | 3k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 7.5k | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J10 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J4 |
| 1 | Conn_02x08_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J1 |
| 1 | DAC7554IDGS | Package_SO:MSOP-10_3x3mm_P0.5mm | U4 |
| 1 | HCPL-0631 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | LM4040DBZ-2.5 | Package_TO_SOT_SMD:SOT-23 | U1 |
| 1 | SN74LVC1G17DBV | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | USB_B_noshield | plinky:USB_B_TE_5787834_Vertical_two_shield | J9 |
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Questions
How big is the Expander just back PCB?
It measures 20.3 × 104.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Expander just back use?
62 parts, built around the SN74LVC1G17DBV, TL072, DAC7554IDGS and HCPL-0631. 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 Expander just back KiCad files?
From the plinkysynth/plinky-expander repository on GitHub, at the commit this page was made from: the board is expander_just_back.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Expander just back design in my own project?
Its repository states no licence, so its author keeps all rights: ask plinkysynth before reusing the design.