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LED Blinking 555 Timer

The document outlines the design and implementation of an LED blinking circuit using a 555 Timer IC in Astable mode. It details the required components, circuit diagram, working principle, and applications of the circuit. The project successfully demonstrates the operation of the 555 Timer and its potential for further extensions in electronic projects.

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Shanthana.k
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87 views8 pages

LED Blinking 555 Timer

The document outlines the design and implementation of an LED blinking circuit using a 555 Timer IC in Astable mode. It details the required components, circuit diagram, working principle, and applications of the circuit. The project successfully demonstrates the operation of the 555 Timer and its potential for further extensions in electronic projects.

Uploaded by

Shanthana.k
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
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Design and Implementation of

LED Blinking Circuit using 555


Timer IC
Student Name: Shanthana K
College: Nadar Saraswathi College of
Engineering and Technology
Internship: ENTHU TECHNOLOGY
SOLUTION PRIVATE LIMITED
Introduction
• • 555 Timer IC is widely used for generating
timing pulses and oscillations.
• • This project demonstrates a simple LED
blinking circuit using 555 timer in Astable
mode.
• • Applications:
• - LED indicators
• - Basic timing circuits
• - Signal generation
Components Required
• • IC: LM555N (1)
• • Resistors: 3.9 kΩ, 4.7 kΩ, 680 Ω
• • Capacitors: 100 µF, 0.0033 µF, 0.01 µF
• • LED: 5 mm (1)
• • Power Supply: 5V DC
• • PCB / Breadboard
Circuit Diagram (Schematic)
• • 555 Timer is configured in Astable Mode.
• • R1, R2, and C2 decide the blinking
frequency.
• • LED blinks based on the charging and
discharging of the capacitor.
• • (Insert schematic image here)
Working Principle
• 1. Astable Multivibrator Mode:
• - Capacitor C2 charges through R1+R2 →
Output HIGH → LED ON.
• - Capacitor discharges through R2 → Output
LOW → LED OFF.
• 2. This cycle repeats, producing continuous
blinking.
• 3. Frequency Formula: f = 1.44 / ((R1 + 2R2) ×
C2)
PCB Layout
• • Compact single-layer PCB (~25 × 24 mm).
• • LED placed at the edge for visibility.
• • C1 (100 µF) acts as power supply filter.
• • (Insert PCB layout image here)
Applications
• • LED status indicators
• • Signal or pulse generators
• • Learning and testing 555 timer applications
• • Timing-based projects
Conclusion
• • Successfully designed and implemented LED
blinking circuit using 555 Timer.
• • Learned about Astable multivibrator
operation and PCB design.
• • Can be extended for:
• - Multiple LED chasers
• - Buzzers or light patterns

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