How To Make A Clap Switch Circuit Using CD4017 IC

Contents hide

1 What is a Clap Switch Circuit?

2 Hardware Components

3 CD4017 Pinout

4 Clap Switch Circuit

5 Working Explanation

What is a Clap Switch Circuit?

A clap switch circuit allows you to achieve remote dynamic control of various devices by using the application of sound. They are used in home automation applications such as sound-activated LEDs & fans, that respond to a knock on the door. So, in this project, we will go through a step-by-step procedure on How To Make A Clap Switch Circuit using a Decade counter IC & a small no. of other components.

The heart of this Clap Switch Circuit is a CD4017 IC. A CD4017 IC is a 16-pin CMOS decade counter/Divider IC with 10 outputs. It is also known as the ‘Johnson 10 stage decade counter’. It has 10 decoded outputs that give output signals one by one in sequence when a clock signal from the clock input is given.

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Hardware Components

The following components are required to make Clap Switch Circuit

S.no	Component	Value	Qty
1.	Decade Counter IC	CD4017	1
2.	Relay	6V/SPDT	1
3.	Transistor	BC547	2
4.	Condensor mic	–	1
5.	filament lamp	220V	1
6	Diode	1N4007	1
7.	Regulator IC	LM7805	1
8.	Resistors	22K, 1K, 470 Ohms	3
9.	wall outlet with plug	220V	1
10.	Soldering Iron	45W – 65W	1
11.	Soldering wire with flux	–	1
12.	Veroboard	–	1
13.	DC Battery	9v – 12v	1
14.	Battery clip	–	1
15.	Jumper wires	–	As per need

CD4017 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer CD4017

Clap Switch Circuit

Working Explanation

The working of this circuit is as follows, sound input is received through the condenser mic, and the mic converts the input sound signal into an electrical signal, which acts as a control signal to the base of the first BC547 transistor. The collector output from the transistor functions as the CLK Input for the CD4017 IC.

The output from pin 2 of the Decade counter serves as the control signal for the second BC547 transistor. The colletor output energizes the coil of the SPDT relay, which subsequently makes the coil & activates the secondary circuit connected to the relay. Always use an SPDT relay with a voltage rating comparable to the input supply (12V/9V/5V).