2 layers64 × 55 mm
2 layers17.9 × 19.6 mm
Opfun
mdavidsaver/pcbEE fumblings
- Size
- 17.9 × 19.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 5
- Nets
- 14
- Pads
- 32
- Tracks, vias
- 66, 2
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 18 Jul 2016
- Updated
- 23 Aug 2017
Overview
Opfun is an open-source printed circuit board by mdavidsaver, from the mdavidsaver/pcb repository on GitHub. It is a 2-layer board of 17.9 × 19.6 mm with 5 parts on 14 nets, routed with 66 tracks and 2 vias.
It is built around the LM324. Its parts include 2 connectors and 1 IC.
Main components
1README
icetest/README.mdArduino Shield w/ iCE40 FPGA
State: Rev 2 tested
Erratta for rev. 2
- Add pull-up on SS
- LP filter/ isolation on SPI line (noticable cross-talk)
ice40 chip used with 3.3V I/O pins and 1.2V core. Chip is not 5V tolerant.
The logic level shifter chips have both 5V and 3.3V. The TI 74LVC chips require that VCCA by power up before, or with, VCCB.
All level shifters VCCA==3.3, VCCB==5
Strictly speaking level shifters not needed for 3.3V -> 5V.
Parts
5| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 0.1u | Capacitors_SMD:C_0603_HandSoldering | CD1, CD2 |
| 1 | LEFT | Pin_Headers:Pin_Header_Straight_1x07 | P1 |
| 1 | LM324 | local:TSSOP-14 | U1 |
| 1 | RIGHT | Pin_Headers:Pin_Header_Straight_1x07 | P2 |
Questions
How big is the Opfun PCB?
It measures 17.9 × 19.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Opfun use?
5 parts, built around the LM324. 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 Opfun KiCad files?
From the mdavidsaver/pcb repository on GitHub, at the commit this page was made from: the board is opfun/opfun.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Opfun design in my own project?
Its repository states no licence, so its author keeps all rights: ask mdavidsaver before reusing the design.
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