2 layers327.9 × 139 mm
Coco2
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
147 parts446
2 layers71 × 50 mm
This is a simple 8-bit binary counter using a NE555 timer IC and a CD4020 binary counter.
- Size
- 71 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 28
- Pads
- 67
- Tracks, vias
- 100, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 29 Mar 2026
- Updated
- 31 Mar 2026
Overview
RH3-ICs is an open-source printed circuit board by ConstintCreations, from the ConstintCreations/Binary-Counter repository on GitHub. It is a 2-layer board of 71 × 50 mm with 23 parts on 28 nets, routed with 100 tracks and 0 vias.
It is built around the NE555P. Its parts include 9 resistors, 8 diodes, 2 capacitors, 2 ICs and 1 connector. It belongs with the retro computing and games boards of this library.
Main components
1README
README.md8-LED Binary Counter
Overview
This is a simple 8-bit binary counter using a NE555 timer IC and a CD4020 binary counter.
Eight LEDs display the binary count, going up based on the NE555 astable timer timing, which can be controlled from a potentiometer.
I made this for Week 3 of Hack Club's Resolution Program's Hardware Pathway.
How it works
An NE555 timer, configured in astable mode, generates a square-wave clock signal with a 100k potentiometer that determines its speed.
A CD4020 binary counter recieves the clock signal and increments the counter which is outputted in binary via 8 LEDs.
Schematic
PCB
KiCanvas
See it here!
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 330 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2, R3, R4, R5, R6, R7, R8, R9 |
| 8 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8 |
| 1 | 100k | Potentiometer_THT:Potentiometer_Bourns_3299X_Horizontal | RV1 |
| 1 | 10nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1 |
| 1 | 10uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C2 |
| 1 | 4020 | Package_DIP:DIP-16_W7.62mm | U2 |
| 1 | 4k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U1 |
Questions
How big is the RH3-ICs PCB?
It measures 71 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the RH3-ICs use?
23 parts, built around the NE555P. 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 RH3-ICs KiCad files?
From the ConstintCreations/Binary-Counter repository on GitHub, at the commit this page was made from: the board is src/kicad/RH3-ICs.kicad_pcb and its schematic src/kicad/RH3-ICs.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the RH3-ICs design in my own project?
Its repository states no licence, so its author keeps all rights: ask ConstintCreations before reusing the design.
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