The document describes a microproject seminar on developing a sound sensor using an LM324 integrated circuit and microphone. It was guided by Miss Rita Pawade and involved team members Pritosh Khanwe, Rahul Warade, Shital Ganeshkar, Rohan Meshram, and Ruchika Bangale from the Electronics and Telecommunication Engineering department of NIT Polytechnic Nagpur. The objectives were to understand how a sound detector works and develop technical skills. The circuit diagram and working of the sound sensor are provided, along with applications such as security systems and skills developed like problem solving.

1. GUIDED BY:- MISS. RITA PAWADE
NAME OF TEAM MEMBER:- 1)PRITOSH KHANWE
2)RAHUL WARADE
3)SHITAL GANESHKAR
4)ROHAN MESHRAM
5)RUCHIKA BANGALE
MICROPROJECT SEMINAR ON
TITLE:-DEVELOP A SOUND SENSOR USING LM 324 AND
MICROPHONE
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

2. 1) AIM AND OBJECTIVE
2) INTRODUCTION
3) COURSE OUTCOME
4) PROGRAM OUTCOME (PO) ACHIEVED
5) DIAGRAM
6) WORKING / PROCEDURE
7) RESOURCES USED
8) APPLICATIONS
9) SKILL DEVELOPED
10) CONCLUSION
11) REFERENCES
CONTENTS
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

3. AIM AND OBJECTIVE
 Understand the actual working of sound detector.
 Develop basic technical knowledge different sound
detector.
 Identify different component use in circuit with pin
configuration.
 We should be able to test the output for different input.
 Correct the error as per defect.
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

4. INTRODUCTION

 As per the design of the sound detector circuit using 741
IC, it works efficiently within the 6 meters limit around the
vicinity where it is fixed.
 This set up can be done in any desirable places like car
porches and at the corners of house.
 As soon as a microphone incorporated in the project
detects sound wave vibration, the sound detector circuit
using op-amp 741 produces beep sounds to alert people
around that area.
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

5. COURSE OUTCOME
 Understand the features of LM324 IC .
 develop the skill to construct and Mount component on
PCB.
 apply the knowledge to build the circuit carefully.
 troubleshoot specified application using various IC like
LM324 IC and etc.
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

6. PROGRAM OUTCOME (PO) ACHIEVED
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)
CO’S
MAPPED
PO’S MAPPED
CO’S PO1 PO2 PO3 PO4 PO5 PO6 PO7 PO8 PO9 PO10
CO1 1 3 3 2 1 1 - 3 3 3
CO2 1 3 1 3 1 1 - 3 2 2
CO3 1 3 1 3 1 2 - 3 3 1
CO4 1 3 3 3 2 1 - 3 2 1
CO5 1 3 2 2 1 1 - 3 3 3

7. CIRCUIT DIAGRAM
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

8. APPLICATION
 Security system for Office or Home
 Spy Circuit
 Home Automation
 Robotics
 Smart Phones
 Ambient sound recognition
 Audio amplifier
 Sound level recognition (not capable to obtain precise dB
value)
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

9. WORKING / PROCEDURE
 The non-inverting pin 3 of IC2 receives input from
amplified output signal of IC1 through another capacitor
C2.
 In the same way, an inverting pin 2 of IC2 fetches input
signal from a reference voltage passed via voltage
controller VR2.
 At the final stage, IC2 output is fed as triggering input
pulse to Darlington pair transistors T1 and T2.
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

10. RESOURCES USED
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)
Sr.No Components Specification Qty
1 Resistors (all ¼-
watt, ± 5% Carbon)
2.8K,
4.7K,10K,1K
05
2 Capacitors 0.47 µf,10
µF/16V
03
3 IC (Operational
Amplifier)
LM741C 01
4 MIC Condenser 01
5 Buzzer Piezo buzzer 01
6 Switch On/off 01
7 battery 9v 01

11. SKILL DEVELOPED
 Complex problem-solving skills and a methodical
mind.
 Critical thinking.
 Strong interest in technology.
 Communications skills.
 Time management and an ability to prioritise and
plan work effectively.
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

12. CONCLUSION AND REFERENCES
 https://www.elprocus.com/sound-sensor-
working-and-its-applications/
 https://bestengineeringprojects.com/sound-
detector-circuit-using-op-amp-741/
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)

13. THANK YOU
NIT POLYTECHNIC NAGPUR
(An NBAAccredited Institute)
(DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING)