Learn Theory of OPAMP circuits and their analysis, 555 timer , Active filters, oscillators.

What you will learn

Understanding the basic characteristics of Operational Amplifier, 555 timer, VCO, active filters and oscillators.

Analysis of different OPAMP circuits such as adder, subtractor, differentiator etc.

Understanding the operation of filters, oscillators and other waveform generators and 555 timer.

Will be able to design analog circuits using opamp and other linear ICs.


OPAMP and Linear ICs are essential parts of Analog Electronic Circuits. Starting from signal amplification, and signal processing to system design, operational amplifier plays a vital role. There are different varieties of OPAMP available in the market with different characteristics and functionalities. Some of them are used for general-purpose applications, some are designed especially for signal amplification, etc.  The basic opamp discussion starts with 741 opamp IC which is fundamental to any OPAMP. This course covers the fundamentals of OPAMP, OPAMP circuits, and other linear ICs. This course is suitable for diploma, and undergraduate students, and electronic hobbyists interested in learning and designing OPAMP-based circuits. This course may be a fundamental step to understanding the essential theories to solve numerical importance for different competitive exams, GATE, and PSUs for Indian students.

———–Topics Covered (till now)———

1. Operational Amplifier (OPAMP) introduction

2. Pin diagram description

3. Block diagram of OPAMP and a brief description of each block.

4. OPAMP circuits: inverting and non-inverting amplifier

5. Concept of virtual ground, voltage follower

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6. Adder, subtractor, and their analysis

7. Differentiator and integrator: Ideal and practical

9. Active filters: 1st and 2nd order filter (Butterworth) design techniques, frequency response.

10. Oscillators (RC phase shift and Wien Bridge) with complete derivations.

11. 555 Timer, Astable, and Monostable operation, detailed derivation with internal circuits, and application of monostable and stable mode

12. Comparators, Schmitt trigger, Zero crossing detector, Square and triangular wave generator using OPAMP




Introduction to Operational Amplifiers
Block Diagram description
OPAMP Symbols and Characteristics
Characteristics and Parameters of OPAMP

Basic OPAMP Circuits

Inverting Amplifier and Virtual ground
Non-inverting Amplifier
Summing Amplifier
Subtractor/Difference Amplifier
Integrator: Basic and Practical
Differentiator: Basic and Practical

Active Filters

1st order Low Pass Filter
1st Order High Pass Filter
2nd Order Active Filter Design


Wien Bridge Oscillator
RC Phase shift Oscillator

555 Timer and its operation

Pin Diagram and Internal circuit
Astable operation
Calculation of ON, OFF Time
Application of Astable mode
Monostable operation
Application of Monostable mode

Comparator and its Application

OPAMP as Comparator
Schmitt Trigger
Square and Triangular Wave generator using OPAMP