2 layers
1bit FA
dguuu/From-Transistor-To-CPU
Plan to use transistor to study how to make a CPU and learn everything will happen irl.
47 parts
2 layers60 × 80 mm
1bit FA v2
dguuu/From-Transistor-To-CPUPlan to use transistor to study how to make a CPU and learn everything will happen irl.
- Size
- 60 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 89
- Nets
- 36
- Pads
- 208
- Tracks, vias
- 200, 9
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Oct 2026
- Updated
- 13 Oct 2026
Overview
1bit FA v2 is an open-source printed circuit board by dguuu, from the dguuu/From-Transistor-To-CPU repository on GitHub. It is a 2-layer board of 60 × 80 mm with 89 parts on 36 nets, routed with 200 tracks and 9 vias.
It is built around the 1N4729A. Its parts include 38 capacitors, 21 transistors, 17 resistors, 9 diodes and 2 connectors.
Main components
1README
README.md10/10 I make a 1bit FA in KiCad and make a PCB Layouted with perfboard. The perfboard size is 9x7cm. In other words, it's 26x31 hole. If I got all of the materials I can make it. By the way I chose all 2n7000 based on NMOS logic. Because its easy to get, lower power consumption than BJT logic, not as complex as CMOS logic and also cheap HAHA. 10/12 Today, after modularizing the layout, I redrew the cabling. The cabling is much more elegant now.
Parts
89| Qty | Value | Footprint | References |
|---|---|---|---|
| 37 | 104 | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23 +21 |
| 21 | 2N7000 | DGu_Library:TO-92_Inline_Wide_small | Q1, Q2, Q3, Q4, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20, Q21 +5 |
| 9 | 10K | DGu_Library:1_4w-resistor | R1, R2, R3, R4, R5, R9, R10, R11, R12 |
| 7 | 1K | DGu_Library:1_4w-resistor | R6, R7, R8, R13, R14, R15, R16 |
| 3 | TR GR | LED_THT:LED_D3.0mm | D1, D2, D4 |
| 2 | TR BL | LED_THT:LED_D3.0mm | D3, D5 |
| 1 | 100uF | Capacitor_THT:C_Radial_D10.0mm_H16.0mm_P5.00mm | C38 |
| 1 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D9 |
| 1 | 1N4729A | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D8 |
| 1 | 330R | DGu_Library:1_4w-resistor | R17 |
| 1 | Conn_01x07_Pin | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Horizontal | J1 |
| 1 | OP BL | LED_THT:LED_D3.0mm | D6 |
| 1 | OP GR | LED_THT:LED_D3.0mm | D7 |
| 1 | resume | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J2 |
| 1 | ~ | Package_DIP:DIP-8_W7.62mm | U1 |
The 88 most common of 89 parts.
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Questions
How big is the 1bit FA v2 PCB?
It measures 60 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 1bit FA v2 use?
89 parts, built around the 1N4729A. 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 1bit FA v2 KiCad files?
From the dguuu/From-Transistor-To-CPU repository on GitHub, at the commit this page was made from: the board is 1bit-FA-v2/1bit-FA-v2.kicad_pcb and its schematic 1bit-FA-v2/1bit-FA-v2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 1bit FA v2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask dguuu before reusing the design.