HardLabs

DonutDongle

svirant·DonutDongle·src/RT4K_donut_dongle.kicad_pcb

DonutDongle PCB layout, top view — open source board by svirant
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About the DonutDongle PCB

DonutDongle is an open source PCB design by svirant, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 42.2 × 68.1 mm, with 40 components from 14 distinct parts.

Other key parts include the MAX3232 and SN74LVC2G07DBVR. By type, the board carries 20 resistors, 9 connectors, 5 capacitors, 2 ICs, 2 jumpers and 1 transistor.

It belongs with the retro computing designs in this gallery.

From the project

Arduino Nano based hub that connects your digital and analog console switching setup with the RetroTink 4K and/or RetroTink 5x/OSSC for Auto Profile switching

Arduino Nano based hub that connects your digital and analog console switching setup with the RetroTink 4K and/or RetroTink 5x / OSSC for Auto Profile switching

The Donut Dongle connects to a switch in a way that allows it to see which port is active. When a console powers on (auto-switching) or an input is manually selected, the Donut Dongle sends a serial command to the RetroTink 4k (or IR signal to the RT5x, OSSC) telling it to load a profile. For the RT4K, the profiles can either be defined as remote profiles; those configured in the menu for the remote buttons. Or they can be SVS…

DonutDongle, from the project README
From the project README

Main components on the DonutDongle

MAX3232SN74LVC2G07DBVR

DonutDongle bill of materials (BOM)

40 components, 14 distinct parts.

QtyPartRefs
1
MAX3232
U1
1
SN74LVC2G07DBVR
U2
1
2N3904
Q1
1
2.54mm Pitch Single Row Female 15P Header Strip
J1
2
2x5 Pin Double Row 2.54mm Pitch Straight Box Header
J3, J6
4
SJ3-35083A-TR
PJ-320
J4, J9, J10, J11
2
2x4 Pin Double Row 2.54mm Pitch Straight Box Header
J5, J8
2
PinHeader_1x03_P2.54mm_Vertical
JP3, JP4
1
PJ-307
PH1
5
0.1UF 50V X7R 0805
C1, C2, C3, C4, C5
1
30 OHM 1% 1/2W 0805
R1
1
1K OHM 1% 1/8W 0805
R2
10
10K OHM 1% 1/8W 0805
R3, R4, R5, R6, R7, R8, R9, R10 +2
8
20K OHM 1% 1/8W 0805
R11, R12, R13, R14, R15, R16, R18, R20

DonutDongle design files

The KiCad project lives in the svirant/DonutDongle repository on GitHub; these links point at the commit this page was built from.

DonutDongle: common questions

How big is the DonutDongle PCB?

The DonutDongle measures 42.2 × 68.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the DonutDongle?

40 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the DonutDongle design files?

From the svirant/DonutDongle repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the DonutDongle design in my own project?

Yes, under the terms of its GPL-3.0 license, which svirant chose for the repository.

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