4 layers99 × 53.3 mm
PSLab
fossasia/pslab-hardware
PSLab Hardware Design and Schematics https://pslab.io
199 parts1.7kApache-2.0
2 layers29 × 19 mm
Atari2600 2TransistorCompMod
AllOurTech/Atari2600_2TransistorCompMod2A PCB design for a two transistor based composit video out mod the the Atari 2600.
- Size
- 29 × 19 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 13
- Pads
- 39
- Tracks, vias
- 40, 16
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 19 Sep 2025
- Updated
- 8 Oct 2025
Overview
Atari2600 2TransistorCompMod is an open-source printed circuit board by AllOurTech, from the AllOurTech/Atari2600_2TransistorCompMod repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 29 × 19 mm with 17 parts on 13 nets, routed with 40 tracks and 16 vias.
It is built around the MMBT3904 and MMBT3906. Its parts include 8 resistors, 3 connectors, 2 transistors and 1 capacitor. It belongs with the retro computing and games boards of this library.
Main components
2README
README.mdAtari2600 Two Transistor Comp Mod
A PCB design for a two transistor based composit video out mod the the Atari 2600.
The schematic is based on the one found in this post on the Atari Age forums.
Gerber files have been generated and can be found in the Gerbers folder including a zip file to be sent to your favorite PCB fab house.
There is also a interactive BOM file in the bom folder
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1K | Resistor_SMD:R_0603_1608Metric | R1, R3 |
| 1 | 10K | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 150r | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 18r | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 3.3K | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 47pF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 5K | Potentiometer_THT:Potentiometer_Vishay_T73YP_Vertical | RV1 |
| 1 | 68r | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 75r | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | AudioIn | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J2 |
| 1 | CompositeOut | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | MMBT3906 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | RFModulatorHeader | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Horizontal | J1 |
The 15 most common of 17 parts.
Questions
How big is the Atari2600 2TransistorCompMod PCB?
It measures 29 × 19 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Atari2600 2TransistorCompMod use?
17 parts, built around the MMBT3904 and MMBT3906. 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 Atari2600 2TransistorCompMod KiCad files?
From the AllOurTech/Atari2600_2TransistorCompMod repository on GitHub, at the commit this page was made from: the board is Atari2600_2TransistorCompMod.kicad_pcb and its schematic Atari2600_2TransistorCompMod.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Atari2600 2TransistorCompMod design in my own project?
Its repository publishes it under the CERN-OHL-P-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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