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Newly Updated Circuit Projects:

Making an Adjustable Electromagnet Circuit

Last Updated on May 28, 2026 by Swagatam 22 Comments

adjustable2Belectromagnet2Bcircuit

This article describes a simple circuit which can be used for pulsing an electromagnet. The IC 555 once again becomes the central part of the circuit. I have explained the making procedure of this simple adjustable electromagnet circuit for varying the magnetic power of an electromagnet. Introduction The circuit was requested by Mr.Jason, one of […]

Filed Under: Home Electrical Circuits Tagged With: Adjustable, Electromagnet, Making

How to Build an Ozone Water/Air Sterilizer Circuit – Disinfecting Water with Ozone Power

Last Updated on May 28, 2026 by Swagatam 49 Comments

We are all familiar with thundering and lightning during stormy weathers and know how the effect is responsible of producing a lot of ozone and negative ions in the atmosphere. The same concept has been employed in the proposed water and air sterilizer circuit. Properties of Ozone Ozone is a pale blue gas having a […]

Filed Under: Home Electrical Circuits Tagged With: Build, Disinfecting, Ozone, Power, Sterilizer, Water

Automatic Evaporative Air Cooler Circuit

Last Updated on May 28, 2026 by Swagatam 10 Comments

automatic2Bcooler

In this post we study a simple moisture sensor circuit which enables an evaporative air cooler to automatically restore the wetness level of its evaporative pad by detecting its moisture level and by activating the water pump accordingly. The idea was requested by Mr. Ankur shrivastava Technical Specifications sir could you please help me to […]

Filed Under: Home Electrical Circuits Tagged With: Automatic, Cooler, Evaporative

Simple Home Automation Circuits

Last Updated on May 28, 2026 by Swagatam 2 Comments

frequency controlled door lock circuit

In this article I have explained a few useful yet easy to build home automation circuits which will help the user to create automatic electronic systems at home. What is Home Automation Home automation basically means converting many of the manually operated home electrical devices into automatically operated devices, through electronics. Today’s real home automation […]

Filed Under: Home Electrical Circuits Tagged With: Automation, Circuits, Home, Simple

Control a Relay ON OFF Using SIM Card, Mobile Phone, and Arduino

Last Updated on May 25, 2026 by Swagatam 8 Comments

This project I will explain how we can control a relay remotely using a SIM card and a normal mobile phone, with help of Arduino and a GSM module. The relay can be turned ON or OFF by sending an SMS or by making a phone call to the SIM card placed inside the GSM […]

Filed Under: Arduino Projects, Automation Projects, Wireless Circuits Tagged With: Card, Control, OFF, ON, Relay, SIM

Mains High Low Voltage Protection Circuit with Delay Monitor

Last Updated on May 25, 2026 by Swagatam 167 Comments

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In this post I have explained 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. Circuit Objectives and Requirements Main […]

Filed Under: Security and Alarm Tagged With: Delay, High, Mains, Monitor, Protection, Voltage

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