Table of Contents
Introduction: Electronics Project for Girlfriend
In this project we will learn how to make Heart Shaped Serial LED Flasher Circuit using 555 Timer and CD4017 decade counter. This electronics project is for your loved one like your girlfriend or boyfriend.
The 555 timer IC is the cheap, popular and precise timing device used in various applications. It gets the name from the three 5KΩ resistors that are used to generate two comparator reference voltages. This IC is operated as monostable, bistable or an astable multivibrator to produce a variety of applications.
The CD4017 is the one of the most popular Decade Counter (Divided by 10 Counter). It is a 5 Stage Divide by 10 Johnson Counter with 10 Decoded outputs. It has a wide supply voltage range from 3V to 15V and is compatible with TTL. It has a medium speed of operation, typically 5Mhz. Its applications includes industrial electronics, remote metering, automotive, medical electronics, instrumentation and alarm systems.
Heart Shaped Serial LED Flasher Circuit using 555 Timer:
1. CD 4017 Counter 2. 555 Timer IC 3. 150, 1K, 10K Resistors 4. 10K Variable Resistor 5. 4.7uf, 100nF capacitor 6. Breadboard 7. 9 Volt Battery 8. LED
Note: All white lines are GND wires
Working of thecircuit:
555 timer IC is used here in astable operating mode which generates a continuous output in the form of square wave via pin 3. The output is then fed into CD4017 decade counter which divides the counting into 10 different steps.
The potentiometer of 10k is used to change the duty cycle of square wave and increase or decrease the LED blinking timing.