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Making an Automatic Stopwatch for Runners, Athletes and Sportpersons

Last Updated on February 4, 2019 by Swagatam

In this post we are going to construct a stopwatch which automatically starts timer when the runner begins to run and the timer stops when the runner reaches the end. […]

Filed Under: Arduino Engineering Projects

How to Use Resistors with LED, Zener and Transistor

Last Updated on October 6, 2019 by Swagatam 56 Comments

In this post we learn how to use resistors while designing an electronic circuits using LEDs, zener diodes, or transistors. This article can be very useful for the new hobbyists […]



Filed Under: Electronics Tutorial

How to Make a Barcode Security Lock Circuit

Last Updated on February 3, 2020 by Swagatam 12 Comments

A simple barcode security lock circuit or barcode scanner circuit is explained in the following article using just a handful of ordinary components such as an op amp, an LDR […]

Filed Under: 555 IC Circuits, Security and Alarm, Sensors and Detectors

Super Capacitor Charger Theory and Working

Last Updated on June 28, 2023 by Swagatam 241 Comments

The post explains a super capacitor charger circuit for charging super capacitors which converts a 12V car battery voltage to an elevated 16V for charging a bank of super capacitors. […]

Filed Under: 555 IC Circuits, Battery Chargers

10 Simple LED Chaser Circuits Explained [Knight Rider, Scanner, Reverse-Forward, Cascaded]

Last Updated on November 23, 2023 by Swagatam 142 Comments

The article discusses the construction of 10 interesting yet simple LED chaser circuits, which not only create beautiful running light effect but are also easy to build. We also discuss […]

Filed Under: Decorative Lighting (Diwali, Christmas)

5 Simple Alarm Circuits for Protecting your Home/Office from Theft

Last Updated on September 4, 2020 by Swagatam 99 Comments

The following article discusses a few very simple intrusion detector circuits, or ant-theft alarms. The presented designs are easy to build yet extremely effective with the functions. How the Circuits […]

Filed Under: Mini Projects, Security and Alarm



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