2 layers63.5 × 71.3 mm BinaryCounterPCB, the printed circuit board in 3D

BinaryCounterPCB

Simple Binary counter using NE555 and CD4040 ICs

Size: 63.5 × 71.3 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 35
Nets: 34
Pads: 98
Tracks, vias: 222, 4
Pours: 1
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 14 Apr 2026
Updated: 25 Apr 2026

Overview

BinaryCounterPCB is an open-source printed circuit board by Wjchou2, from the Wjchou2/BinaryCounterPCB repository on GitHub. It is a 2-layer board of 63.5 × 71.3 mm with 35 parts on 34 nets, routed with 222 tracks and 4 vias.

It is built around the NE555D. Its parts include 15 resistors, 12 diodes, 3 capacitors, 2 ICs and 2 switches.

Main components

NE555D
SOIC-80℃~+70℃ 10mA 4.5V~16V SOIC-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters

README

README.md

A Simple Binary counter using NE555 and CD4040 ICs and powered by a USB A receptacle. The Board includes 2 buttons (Increment and Reset) and an array of 4x3 LEDs that can show represent a count up to 4095. To read the binary number, simply add up all the values of the lit up LEDs, and thats the counter number!

View KiCad board in KiCanvas

Schematic!

PCB!

3d Render!

Usage

Soldier all the parts onto the board
Connect to a power source via the USB A receptacle
Use the buttons to increment and reset the counter!

BOM

Id	Designator	Footprint	Quantity	Designation
1	D11,D9,D1,D5,D8,D7,D2,D3,D6,D4,D10,D12	LED_D5.0mm	12	LED
2	C1	C_Disc_D8.0mm_W5.0mm_P5.00mm	1	10 uF
3	R1	R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	1	100k
4	J1	USB_A_Molex_67643_Horizontal	1	USB_A
5	R7,R9,R5,R10,R13,R6,R11,R12,R4,R3,R8,R14	R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	12	450Ω
6	U1	DIP-8_W7.62mm	1	NE555D
7	C2	C_Disc_D8.0mm_W5.0mm_P5.00mm	1	0.01 µF
8	R2,R15	R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	2	10k
9	SW2,SW1	SW_PUSH-12mm	2	SW_Push
10	C3	C_Disc_D8.0mm_W5.0mm_P5.00mm	1	0.1 uF
11	U2	DIP-16_W7.62mm	1	4040

Project files

Show this board on your page

https://pcbkit.io/boards/Wjchou2/BinaryCounterPCB

The board's own page, for a message or a post.

Source

Repository: Wjchou2/BinaryCounterPCB
Board file: src/kicad/Untitled.kicad_pcb
Commit: 2609cc8
Licence: Not stated

Parts

Qty	Value	Footprint	References
12	450Ω	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14
12	LED	LED_THT:LED_D5.0mm	D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12
2	10k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R2, R15
2	SW_Push	Button_Switch_THT:SW_PUSH-12mm	SW1, SW2
1	0.01 µF	Capacitor_THT:C_Disc_D8.0mm_W5.0mm_P5.00mm	C2
1	0.1 uF	Capacitor_THT:C_Disc_D8.0mm_W5.0mm_P5.00mm	C3
1	10 uF	Capacitor_THT:C_Disc_D8.0mm_W5.0mm_P5.00mm	C1
1	100k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R1
1	4040	Package_DIP:DIP-16_W7.62mm	U2
1	NE555D	Package_DIP:DIP-8_W7.62mm	U1
1	USB_A	Connector_USB:USB_A_Molex_67643_Horizontal	J1

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Questions

How big is the BinaryCounterPCB PCB?

It measures 63.5 × 71.3 mm and has 2 copper layers, 1.6 mm thick.

What parts does the BinaryCounterPCB use?

35 parts, built around the NE555D. 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 BinaryCounterPCB KiCad files?

From the Wjchou2/BinaryCounterPCB repository on GitHub, at the commit this page was made from: the board is src/kicad/Untitled.kicad_pcb and its schematic src/kicad/Untitled.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the BinaryCounterPCB design in my own project?

Its repository states no licence, so its author keeps all rights: ask Wjchou2 before reusing the design.