2 layers155.2 × 78.6 mm
80ColumnCard
btb/80ColumnCard
An Apple II 80-Column Card. Based on the Videx Videoterm
47 parts43Apache-2.0
2 layers30.5 × 48.3 mm
SoftSwitch
btb/80ColumnCard43An Apple II 80-Column Card. Based on the Videx Videoterm
- Size
- 30.5 × 48.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 30
- Pads
- 80
- Tracks, vias
- 70, 0
- Pours
- 88
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 19 Sep 2022
- Updated
- 14 Aug 2026
Overview
SoftSwitch is an open-source printed circuit board by btb, from the btb/80ColumnCard repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 30.5 × 48.3 mm with 17 parts on 30 nets, routed with 70 tracks and 0 vias.
Its parts include 6 resistors, 4 connectors, 2 diodes, 2 transistors and 1 fuse.
README
hardware/SoftSwitch/README.mdParts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1N 914 | Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal | D1, D2 |
| 2 | 2K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3 |
| 1 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 200 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 200 | MyPotentiometer:Multi_Potentiometer_6mm_Vertical | RV1 |
| 1 | 28 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 3904 | Package_TO_SOT_THT:TO-92 | Q1 |
| 1 | 3906 | Package_TO_SOT_THT:TO-92 | Q2 |
| 1 | 40 COL IN | Connector_Wire:SolderWire-0.1sqmm_1x03_P3.6mm_D0.4mm_OD1mm_Relief | J2 |
| 1 | 40 COL OUT | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | 5.1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 74LS259/9334 | Package_DIP:DIP-16_W7.62mm_Socket | F14 |
| 1 | 80 COL IN | Connector_Wire:SolderWire-0.1sqmm_1x02_P3.6mm_D0.4mm_OD1mm_Relief | J1 |
| 1 | F14 passthrough | Package_DIP:DIP-16_W7.62mm_Socket | FP14 |
| 1 | VIDEO OUT | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | J3 |
Questions
How big is the SoftSwitch PCB?
It measures 30.5 × 48.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SoftSwitch use?
17 parts. 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 SoftSwitch KiCad files?
From the btb/80ColumnCard repository on GitHub, at the commit this page was made from: the board is hardware/SoftSwitch/SoftSwitch.kicad_pcb and its schematic hardware/80ColumnCard/80ColumnCard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SoftSwitch design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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