2 layers
2 layers87.6 × 52.6 mm
8-bit computer clock pcb
xrayer2000/8-bit-computer-Documentation30My 8-bit computer
- Size
- 87.6 × 52.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 22
- Nets
- 26
- Pads
- 118
- Tracks, vias
- 218, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 17 Feb 2020
- Updated
- 17 Jun 2025
Overview
8-bit computer clock pcb is an open-source printed circuit board by xrayer2000, from the xrayer2000/8-bit-computer-Documentation repository on GitHub. It is a 2-layer board of 87.6 × 52.6 mm with 22 parts on 26 nets, routed with 218 tracks and 0 vias.
It is built around the NE555P, 74HCT00D and 74HCT04D, with the 74HCT08D and 74HCT32D among its other parts. Its parts include 7 resistors, 3 capacitors and 1 connector. It belongs with the retro computing and games and lEDs and displays boards of this library.
Main components
5
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
74HCT00D
SO-14-40℃~+125℃ 100mV、400mV 12ns@4.5V,50pF 2 2V 3.7V、4.4V 4 4.5V~5.5V 40uA 4mA 4mA 74HCT Series 800mV NAND Gate Overvoltage-tolerant input TTL Compatible CMOS SO-14 Logic Gates ROHSNexperiaLogic Gates74HCT04D
SO-14-40℃~+125℃ 1 19ns@4.5V,50pF 2V 2uA 3.7V 4.5V~5.5V 400mV 4mA 4mA 6 74HCT 800mV SO-14 Inverters ROHSNexperiaInverters74HCT08D
SOP-14-40℃~+125℃ 100mV、330mV 16ns@4.5V,15pF 2 2V 3.84V、4.4V 4 4.5V~5.5V 74HCT 800mV AND Gate TTL compatible CMOS SOP-14 Logic Gates ROHSMDDLogic Gates74HCT32D
SO-14-40℃~+125℃ 2 24ns@4.5V,50pF 2V 2uA 3.7V、4.4V 4 4.5V~5.5V 400mV 4mA 4mA 74HCT Series 800mV OR Gate SOIC-14 Logic Gates ROHSNexperiaGates
README
README.mdLICENSE
README
This project is licensed under the Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
You are free to:
- Share (copy and redistribute the material in any medium or format)
- Adapt (remix, transform, and build upon the material)
Under the conditions that:
- You must give appropriate credit.
- You may not use the material for commercial purposes.
For full license details, see:
https://creativecommons.org/licenses/by-nc/4.0/
Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Copyright (c) 2025 Emil
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
Under the following terms:
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made.
- NonCommercial — You may not use the material for commercial purposes.
No additional restrictions — You may not apply legal terms or technological measures that restrict others from doing anything the license permits.
Full license text:
https://creativecommons.org/licenses/by-nc/4.0/legalcode
How to attribute
If you use or adapt this project, please include the following attribution:
“Project name” by Emil is licensed under CC BY-NC 4.0.
https://creativecommons.org/licenses/by-nc/4.0/
Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R5 |
| 2 | 100u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C2, C3 |
| 2 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6, R7 |
| 2 | NE555P | Package_DIP:DIP-8_W7.62mm | 555, 555 |
| 1 | 0.1u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1 |
| 1 | 1.47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 74HCT00 | Package_DIP:DIP-14_W7.62mm | 7400 |
| 1 | 74HCT04 | Package_DIP:DIP-14_W7.62mm | 7404 |
| 1 | 74HCT08 | Package_DIP:DIP-14_W7.62mm | 7408 |
| 1 | 74HCT32 | Package_DIP:DIP-14_W7.62mm | 7432 |
| 1 | Clock | LED_THT:LED_D3.0mm_IRBlack | Clock |
| 1 | Conn_01x08_Female | Connector_IDC:IDC-Header_2x04_P2.54mm_Vertical | J1 |
| 1 | L-115WEGW-CA | L-115WEGW-CA:DUOLED-A-3MM | M/P |
| 1 | R_POT | 3386P-1-101T:TRIM_3386P-1-101T | Pot |
| 1 | SW_SPDT | Button_Switch_THT:Switch_on_off | SW |
| 1 | manual clock | Button_Switch_THT:SW_PUSH_6mm | Button |
Questions
How big is the 8-bit computer clock pcb PCB?
It measures 87.6 × 52.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 8-bit computer clock pcb use?
22 parts, built around the NE555P, 74HCT00D, 74HCT04D and 74HCT08D. 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 8-bit computer clock pcb KiCad files?
From the xrayer2000/8-bit-computer-Documentation repository on GitHub, at the commit this page was made from: the board is Kicad/8-bit-computer/8-bit-computer_clock_pcb/8-bit-computer_clock_pcb.kicad_pcb and its schematic Kicad/8-bit-computer/8-bit computer_Boot_loader/8-bit computer_Boot_loader.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 8-bit computer clock pcb design in my own project?
Its repository states no licence, so its author keeps all rights: ask xrayer2000 before reusing the design.
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