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AC Motor Speed Controller Circuits using Back EMF

Last Updated on June 30, 2026 by Swagatam 57 Comments

drill speed controller circuit

In this post I have explained a few circuit diagrams for building AC motor speed controller circuits using back EMF concept. Working Principle of AC Motors So now, all those home type appliances like electric drill machines, sander machines, sewing machines, food mixer machines, etc. they all are mostly using that AC motor which is […]

Filed Under: Motor Controller Tagged With: AC, Back, Circuits, Controller, Motor, Speed

What is Hysteresis in Electronic Circuits

Last Updated on May 20, 2026 by Swagatam 11 Comments

hysteresis in relay

You might have searched regarding what is hysteresis a number of times through many different posts on different websites, but to no avail. You might have also tried to find a comprehensive as well as an easy explanation regarding the same through various websites. However, the explanations provided over these websites are pretty long and […]

Filed Under: Electronics Theory Tagged With: Circuits, Electronic, Hysteresis

Build Simple Transistor Circuits

Last Updated on June 23, 2026 by Swagatam 73 Comments

variable power supply transistor

A compilation of important assorted transistor simple circuits to build has been included here. Simple Transistor Circuits for New Hobbyists Many simple transistor configurations like, rain alarm, delay timer, set reset latch, crystal tester, light sensitive switch and many more have been discussed in this article. In this compilation of simple transistor circuits (schematics) you […]

Filed Under: Mini Projects Tagged With: Build, Circuits, Simple, Transistor

6 Simple Capacitance Meter Circuits Explained – Using IC 555 and IC 74121

Last Updated on June 8, 2026 by Swagatam 59 Comments

FrequencyMeter

In this post I will talk about 6 easy yet accurate capacitance meter circuits using the ubiquitous IC 555 and many other easily available ICs. How Capacitors Work Capacitors are one of the main electronic components which come under the passive component family. These are extensively used in electronic circuits and virtually no circuit can […]

Filed Under: Meters and Testers Tagged With: 555, Capacitance, Circuits, Explained, Meter, Simple

5 Interesting Flip Flop Circuits – Load ON/OFF with Push-Button

Last Updated on June 23, 2026 by Swagatam 129 Comments

Five simple yet effective electronic toggle flip flop switch circuits can be built around the IC 4017, IC 4093, and IC 4013. We will see how these can be implemented for switching a relay alternately ON OFF by alternately pressing a single push-button or through touch pads, which in turn will switch an electronic load […]

Filed Under: Mini Projects Tagged With: Circuits, Flip, Flop, Interesting, Load, ON

16 Easy IC 741 Op Amp Circuits Explained

Last Updated on June 23, 2026 by Swagatam 34 Comments

1 16

The 16 fundamental IC 741 based op amp circuits presented here are not only interesting but also very amusing to build. The included circuit ideas like inverting and non-inverting amplifiers, tone control and regulated power supply will surely intrigue you. Circuit diagrams are also attached with the article. Application Circuits (Learn More) We all are […]

Filed Under: Mini Projects Tagged With: 741, Circuits, Easy, Explained

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