A
Micro-project report on
“ASK Modulator Using 555 Timer IC”
Submitted by
Roll No. Name of students
EJ-202 Mr. Chirandas Sainath Prabhakar
EJ-211 Mr. Ghodake Vivek Revansiddha
EJ-215 Mr. Kharat Tanmay Keraba
EJ-235 Mr. Kumar Dhiraj
EJ-244 Mr. Sutar Virbhadra Yalkant
EJ-252 Mr. Mane Abhishek Vijaykumar
UNDER THE GUIDANCE OF
(Mr. Bagban S. R.)
DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING
Shanti Education Society’s
A.G. Patil Polytechnic Institute, Solapur.
NBA Accredited Programs
ACADEMIC YEAR (2022-2023)
Shanti Education Society’s
A.G. Patil Polytechnic Institute, Solapur.
CERTIFICATE
This is to certify that the micro-project report on “ASK Modulator Using 555 Timer IC” has been
submitted by EJ-(202,211,215,235,244,252) of S.Y. (Electronics and Telecommunication
Engineering) has completed predefined micro project satisfactorily in course Digital Communication
System (22428) for the academic year 2022-2023 as prescribed in the curriculum of M.S.B.T.E.
Course Coordinator Program Head
(Mr. Bagban S. R.) (Mr. Bagban S. R.)
PRINCIPAL
Dr. Chougule M. A.
(A.G.P.P.I. SOLAPUR)
Title: - “ASK Modulator Using 555 Timer IC”
1.0 INTRODUCTION:
Amplitude Shift Keying (ASK) is a type of Amplitude Modulation which represents the
binary data in the form of variations in the amplitude of a signal.
Any modulated signal has a high frequency carrier. The binary signal when ASK modulated, gives a
zero value for Low input while it gives the carrier output for High input.
The following figure represents ASK modulated waveform along with its input.
ASK Modulator
The ASK modulator block diagram comprises of the carrier signal generator, the binary sequence from
the message signal and the band-limited filter. Following is the block diagram of the ASK Modulator.
The carrier generator sends a continuous high-frequency carrier.
The binary sequence from the message signal makes the unipolar input to be either High or Low. The
high signal closes the switch, allowing a carrier wave. Hence, the output will be the carrier signal at
high input. When there is low input, the switch opens, allowing no voltage to appear. Hence, the output
will be low.
The band-limiting filter shapes the pulse depending upon the amplitude and phase
characteristics of the band-limiting filter or the pulse-shaping filter.
ASK Demodulator
There are two types of ASK Demodulation techniques. They are −
Asynchronous ASK Demodulation/detection
Synchronous ASK Demodulation/detection
The clock frequency at the transmitter when matches with the clock frequency at the receiver, it is
known as a Synchronous method, as the frequency gets synchronized. Otherwise, it is known
as Asynchronous.
Asynchronous ASK Demodulator
The Asynchronous ASK detector consists of a half-wave rectifier, a low pass filter, and a comparator.
Following is the block diagram for the same.
The modulated ASK signal is given to the half-wave rectifier, which delivers a positive half output.
The low pass filter suppresses the higher frequencies and gives an envelope detected output from
which the comparator delivers a digital output.
Synchronous ASK Demodulator
Synchronous ASK detector consists of a Square law detector, low pass filter, a comparator, and a
voltage limiter. Following is the block diagram for the same.
The ASK modulated input signal is given to the Square law detector. A square law detector is one
whose output voltage is proportional to the square of the amplitude modulated input voltage. The low
pass filter minimizes the higher frequencies. The comparator and the voltage limiter help to get a clean
digital output.
Circuit Diagram
2.0 Aim of micro-project:
To study the generation of Ask signal.
To learn the use of Ask modulator.
3.0 Co’s Covered:
Co2: Use various pulse code modulation techniques.
Co3: Maintain system based on digital modulation techniques.
4.0 Action Plan:
Serial Planned Planned Name of Responsible
Details of Activity
No. Start Date Finish Date Team Members
Group formation & topic
1. 14/02/2023 20/02/2023 All Group Members
selection discussion.
Discussion of group with
2. 21/02/2023 27/02/2023 All Group Members
project guide.
3. Finalization of topic. 28/02/2023 06/03/2023 All Group Members
Data collection & Arrangement
4. 10/03/2023 13/03/2023 Mr. Mane Abhishek
of data.
5. Preparation of model. 14/03/2023 20/03/2023 Mr. Sutar Virbhadra
6. Data correction. 21/03/2023 31/03/2023 Mr. Kharat Tanmay
7. Preparation of proposal. 01/04/2023 04/04/2023
Mr. Chirandas Sainath
8. Presentation of proposal. 05/04/2023 11/04/2023
9. Data collection through internet. 15/04/2023 17/04/2023 Mr. Dhiraj Kumar
10. Submission of model 18/04/2023 25/04/2023 All Group Members
11. Preparation of report
28/04/2023 02/05/2023 Mr. Ghodake Vivek
12. Presentation of report
Final submission of the Micro-
13. 06/05/2023 06/05/2023 All Group Members.
project
5.0Resources used:
Sr. Name Of Resources/ Specification. Qty. Remarks
No. Material.
https://www.engineersgarage.com/ask- 1 Available
1. Internet modulator-using-555-timer-ic/
Computer
2. Microsoft World 1
Facility Available
IC 555
2
Potentiometer 2
Components Available
3. required in Capacitor 4
Project Resister 2
General purpose PCB 1
Reference Communication Systems
4. (Simon S. Haykin) 1 Available
Books
6.0 Skills developed / Learning out of this Micro-project:
• Component identification.
• Handle components & equipment carefully.
• Other skills such as critical thinking, collaboration, and creativity.
• Communication between group members.
• Able to generate Ask Signal.
• Able to understand the characteristics of Ask Signal.
