2 layers
Encoder
byrantech/laptop
anyon_e, a highly integrated, high end, open source laptop. Attempt the impossible.
7 parts4.3kMIT
2 layers38.5 × 34.2 mm
ProPrj square 2026-03-05
Regulus2627/555-Timer-Square-Wave-GeneratorThis project implements an Astable Multivibrator using the NE555 Timer IC to generate a stable square wave. It was designed, simulated in LTspice, and built on a PCB.
- Size
- 38.5 × 34.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 7
- Nets
- 6
- Pads
- 19
- Tracks, vias
- 40, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 May 2026
- Updated
- 1 May 2026
Overview
ProPrj square 2026-03-05 is an open-source printed circuit board by Regulus2627, from the Regulus2627/555-Timer-Square-Wave-Generator repository on GitHub. It is a 2-layer board of 38.5 × 34.2 mm with 7 parts on 6 nets, routed with 40 tracks and 0 vias.
Its parts include 2 capacitors, 2 resistors and 1 IC.
README
README.md555 Timer Square Wave Generator
This project implements an Astable Multivibrator using the NE555 Timer IC to generate a stable square wave. It was designed, simulated in LTspice, and built on a PCB.
Objectives
- Frequency: ~650 Hz
- Duty Cycle: ~65%
- Tools Used: LTspice + EasyEDA PCB
Circuit Details
The 555 timer operates in Astable Mode, continuously switching between HIGH and LOW.
Components:
- R1 = 12 kΩ
- R2 = 6.2 kΩ
- C2 = 0.1 µF (Timing)
- C1 = 0.01 µF (Bypass)
- Vcc = 5V
Results
| Parameter | Theoretical | Simulation | Hardware |
|---|---|---|---|
| Frequency | 642 Hz | 648 Hz | 555 Hz |
| Duty Cycle | 65% | 65% | 66% |
Note: Hardware variation is due to component tolerances and PCB effects.
Project Structure
- /docs → Report (Output waveforms & PCB photos)
- /simulation → LTspice files
- /pcb → PCB design (EasyEDA)
Simulation Steps
- Open
.ascfile in LTspice - Run: .tran 0 10m
- View output waveform
Team
- Nimisha Thoppil
- Sagarika Pramod
- Aishwarya Vaidya
- Vaibhav Shelar
Guide: Prof. Swati Patil
Pillai College of Engineering
Applications
- Clock signals
- PWM generation
- Basic oscillators
Parts
7| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | ProPrj_square_2026-03-05:RES-TH_BD1.8-L3.2-P7.20-D0.4 | R1, R2 | |
| 2 | ProPrj_square_2026-03-05:CAP-TH_L4.9-W3.7-P5.08-D0.5 | C1, C2 | |
| 1 | ProPrj_square_2026-03-05:HDR-TH_1P-V-M_XKB_X4611WV-01I-C28D40 | H2(output) | |
| 1 | ProPrj_square_2026-03-05:DIP-8_L9.8-W6.6-P2.54-LS7.6-BL | U1 | |
| 1 | ProPrj_square_2026-03-05:HDR-TH_2P-P2.54-V-F | H1(Power) |
Questions
How big is the ProPrj square 2026-03-05 PCB?
It measures 38.5 × 34.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ProPrj square 2026-03-05 use?
7 parts. 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 ProPrj square 2026-03-05 KiCad files?
From the Regulus2627/555-Timer-Square-Wave-Generator repository on GitHub, at the commit this page was made from: the board is pcb/ProPrj_square_2026-03-05.kicad_pcb and its schematic pcb/ProPrj_square_2026-03-05.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ProPrj square 2026-03-05 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Regulus2627 before reusing the design.
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