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SuperCapacitors Explained

In this post we are going to understand what a supercapacitor is, how closely similar or different to an ordinary capacitor, where it is used and we will be doing apples to apples comparison between batteries and supercapacitors to find out which one of them is superior. By Girish Radhakrishnan Let’s understand the basics of … Continue reading

Buzzer Circuit with Incrementing Beep Rate

The post discusses a buzzer circuit with an incrementing beeping rate, which can be used in critical warning signalling applications. The idea was requested by Mr. Lee. The Request Hi Swagatam, please could you help me with a circuit.i’ve been trying to find but so far had no luck!i need a pulsing piezo that will … Continue reading

Mains High Low Voltage Protection Circuit with Delay Monitor

The post explains an upgraded version of my previous mains 220V/120V high-low voltage cut off protection circuit which now includes a delayed restoration of power for the load with 3 LED power status indicators. The idea was requested by one of the dedicated members of this website. The Request Dear Swagatam, I just followed you’re … Continue reading

Automatic Stopwatch Circuit for Runners

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. The elapsed time between starting and ending point is displayed on a 16 x 2 LCD. By Girish Radhakrishnan This project is developed for athletes … Continue reading

High Current Wireless Battery Charger Circuit

In this article we learn regarding how to design and make your own customized high current wireless battery charger circuit using wireless power transfer concept. In many of my earlier articles I have comprehensively discussed wireless power transfer, in this article we will go a step ahead and try to learn how to design a … Continue reading

Clap Operated Toy Car Circuit

In this post we study how to make a simple clap operated toy car circuit using a clap switch circuit and a MIC amplifier, to control its forward and reverse movements,  in response to the claps of the user. The idea was requested by Mr, Zeeshan. The Request Sir, I am in urgent and very … Continue reading

Mini Weather Station Using Arduino

 In this post we are going to construct an interesting Arduino based mini weather station project, which can show you ambient temperature, humidity, pressure, air quality and much more data from your surroundings, which can be used to predict weather from home.                     By Girish Radhakrishnan If you are interested in meteorology this project … Continue reading

Simple Cloth Dryer Circuit

The post explains a simple homemade electric cloth dryer circuit using iron heater coil assembly which can be used for drying clothes at home during rainy season or overcast conditions. The idea was requested by Mr. Nelson.  The Request Hi Mr. Swagatham, I have read through some of the topics explained at your web site … Continue reading

Piezo Mat Electricity Generator Circuit

In this post we learn a method to harvest free electricity from a  piezo embedded mat by walking on it, and try to investigate how this energy may be used for charging a small battery. Normally a human body carries a huge amount of energy which simply gets wasted in our regular day to day … Continue reading

Electronic Engine Speed Governor Circuit

The post discusses an electronic engine speed governor or controller circuit using an RPM feedback signal loop through a hall effect sensor network. The idea was requested by Mr. Imsa Naga. The Request Thank you very much for your time. I believe this circuit would be suitable for a single phase supply. My alternator is … Continue reading