2 layers59.7 × 62.2 mm
IBolit ngo kicad
MCMarcusAntony/iBOLIT-1.5
Tools added to this board are: - Logic probe included on Top three pin connector. - Lighting and acoustic signals to identify HIGH and LOW status.
38 parts2
2 layers100 × 80 mm
Rel num display
karolzmijewski/8bit-comp1Currently, the project is in the process of migrating from Eagle, which is no longer available for free for non-commercial use, to KiCad (an open-source PCB design and electronics CAD software).
- Size
- 100 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 29
- Pads
- 112
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 13 Jul 2024
- Updated
- 13 Sep 2026
Overview
Rel num display is an open-source printed circuit board by karolzmijewski, from the karolzmijewski/8bit-comp repository on GitHub. It is a 2-layer board of 100 × 80 mm with 12 parts on 29 nets.
It is built around the NE555N. Its parts include 4 ICs, 4 diodes, 2 capacitors and 2 resistors. It belongs with the lEDs and displays boards of this library.
Main components
1README
README.mdNAT-8C1: CISC CPU
⚠️ Warning: This project is currently under development. It has not yet been fully verified and may be incomplete or unstable. Stay tuned for updates.
Overview
NAT-8C1 (NATALIE CPU 8bit CISC 1) is an single-core, 8-bit, in-order, non-pipelined, non-hyperthreaded, CISC, ACU-based CPU. This is a basic
implementation derived from a of modified MARIE CPU. This simple computer described in The Essentials of Computer Organization and Architecture,
a book written by Linda Null and Julia Lobur. The project was developed for educational purposes.
Documentation
List of available documents:
Schematics
Currently, the project is in the process of migrating from Eagle, which is no longer available for free for non-commercial use, to KiCad (an open-source PCB design and electronics CAD software). The following files should be tracked in the repository for the new CAD software:
| Extension / File | Purpose | Tracked in Git? |
|---|---|---|
*.kicad_sch | Schematic Sheet — Main schematic drawing containing components, wires, labels, and net connections. | Yes |
*.kicad_pro | Project File — Project settings, ERC parameters, and schematic configurations. | Yes |
sym-lib-table | Symbol Library Table — Maps project-level library nicknames to symbol file paths. | Yes |
*.kicad_sym | Symbol Library — Component symbol definitions (located in design/lib/eagle-import/). | Yes |
*.kicad_prl | Local Runtime Settings — User-specific GUI state (window positions, zoom levels, open tabs). Auto-generated per user. | ❌ No |
*.lck, ~*.lck | Lock Files — Created by KiCad when a project is open to prevent concurrent writes. | ❌ No |
_autosave-*, *-backups/ | Autosaves & Backups — Temporary recovery files and auto-backup folders. | ❌ No |
.history/ | Editor Local History — Local IDE snapshot directory. | ❌ No |
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | rel-num-display-import-fps:7SEG-13 | D1, D2, D3, D4 | |
| 2 | 2n | rel-num-display-import-fps:C025-025X050 | C1, C2 |
| 1 | rel-num-display-import-fps:DIL24 | IC2 | |
| 1 | 100k | rel-num-display-import-fps:0204_5 | R1 |
| 1 | 1k | rel-num-display-import-fps:0204_5 | R2 |
| 1 | 7476N | rel-num-display-import-fps:DIL16 | IC1 |
| 1 | 74LS139N | rel-num-display-import-fps:DIL16 | IC5 |
| 1 | NE555N | rel-num-display-import-fps:DIL08 | IC4 |
Questions
How big is the Rel num display PCB?
It measures 100 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Rel num display use?
12 parts, built around the NE555N. 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 Rel num display KiCad files?
From the karolzmijewski/8bit-comp repository on GitHub, at the commit this page was made from: the board is design/display/schema/rel-num-display/rel-num-display.kicad_pcb and its schematic design/alu/schema/rel-2b-alu/rel-2b-alu.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Rel num display design in my own project?
Its repository states no licence, so its author keeps all rights: ask karolzmijewski before reusing the design.
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