555 Timer Clock – 2‑Layer PCB Demonstration (KiCad)

Overview

This project is a beginner‑level demonstration of a 2‑layer PCB design created in KiCad, using a simple 555 Timer Clock circuit as the example.

The primary goal of this project is to teach and practice basic 2‑layer PCB concepts, not to create an optimized or production‑ready design. It is intended for students, hobbyists, and beginners learning PCB layout.

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Learning Objectives

This project demonstrates:

• Basic 2‑layer PCB layout (Top & Bottom copper)
• Proper use of ground planes
• Via usage between layers
• Simple component placement and routing
• KiCad schematic → PCB workflow

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Circuit Description

The circuit is based on a NE555 Timer IC configured in astable mode to generate a continuous clock signal.

The timing frequency is set by two resistors and one capacitor: