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Newly Updated Circuit Projects:

How to Connect IC 4066 in a Circuit

Last Updated on May 17, 2026 by Swagatam 14 Comments

IC 4066 pinouts

In this article, I will try to explain how to connect the input and output pinouts of the bilateral switch IC 4066. We will learn how to correctly configure and use the IC 4066 pinouts in a circuit. The 4066 actually performs the role of an analogue switch. The 4066 is an integrated circuit made […]

Filed Under: Datasheets and Components Tagged With: 4066, Connect

Basic Op Amp Circuits and Projects

Last Updated on June 23, 2026 by Swagatam 20 Comments

op amp integrator equation relationship

In the following article I have explained op amp basic application circuits and projects, with equations, for solving their specific component values. Op-amps (operational amplifiers) are a specialized type of integrated circuit that include a directly-coupled, high-gain amplifier with an overall response characteristics adjusted by a feedback. The op-amp derives its name from the fact […]

Filed Under: Mini Projects Tagged With: Basic, Circuits, Projects

What are the Different Types of Transformers? Explained

Last Updated on May 20, 2026 by Swagatam 39 Comments

transformer turns

In this post I am going to explain different types of electrical transformers that are used in a wide variety of applications. Transformers can be classified in many different ways, for example: based on their input / output character, voltage, frequency, application, power handling capacity etc.  In this post we will be exploring all the […]

Filed Under: Electronics Theory Tagged With: Different, Explained, Transformers, Types

Laptop Power Bank Circuit

Last Updated on May 17, 2026 by Swagatam 63 Comments

laptop power bank configuration compressed

In this post I have explained how to build a simple laptop power bank circuit which can be used for charging a laptop battery during travelling or during outdoor trips. This device can be specifically useful on situations or places where an AC mains outlet is unavailable or difficult to find. Why Laptops Need a […]

Filed Under: Battery Charger Circuits Tagged With: Bank, Laptop, Power

7 Automatic Street Light Circuits [Using Relays and Solar Panel]

Last Updated on June 8, 2026 by Swagatam 35 Comments

simple single transistor street light circuit

In this article I will elucidate 7 useful yet simple automatic street light circuits using 220 V relays and solar panel. All the presented circuits can be used for automatically switching a lamp ON during night time and OFF during day time. What is an Automatic Street Light System An automatic street light system is […]

Filed Under: Automation Projects, Lamps and Lights Tagged With: Automatic, Circuits, Light, Relays, Solar, Street

Power Amplifier Circuit using IC 741 and MOSFET

Last Updated on May 15, 2026 by Swagatam 10 Comments

741 power amplifier circuit

In this post we study a power amplifier design configured using an ordinary IC 741 and a couple of MOSFETs. An operational amplifier’s output power such as from an IC 741 can be typically enhanced when a complementary emitter follower transistor is coupled at its output. The same could also generally be accomplished using a […]

Filed Under: Audio and Amplifier Projects Tagged With: 741, Amplifier, MOSFET, Power

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