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New Circuit Projects

Simple Mobile Phone Detector Circuit [Tested]

Last Updated on December 13, 2024 by Swagatam 162 Comments

RFsensor

A cellphone or mobile phone detector is actually a high gain op amp amplifier which detects slightest of RF disturbance from a mobile phone, and illuminates an LED. Mobile phones today being the major generator of RF interference is easily picked up by this circuit and can be seen through an LED illumination at the […]

Filed Under: Sensors and Detectors Tagged With: Detector, Mobile, Phone, Simple, Tested

GSM Based Cell Phone Remote Control Switch Circuit

Last Updated on August 12, 2024 by Swagatam 184 Comments

This circuit will allow you to control any electrical gadget from any part of the world through your cellphone remotely, that too without spending a penny for the individual commands. Circuit Concept Whether it’s you vehicle, your basement door, your mansion gate or simply the air conditioner of your house, everything can now be switched […]

Filed Under: Remote Control Circuits Tagged With: Based, Cell, Control, GSM, Phone, Remote

AC Motor Speed Controller Circuits using Back EMF

Last Updated on May 19, 2025 by Swagatam 52 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

How to Generate Electricity from Sea Water – 2 Simple Methods

Last Updated on January 2, 2024 by Swagatam 4 Comments

seawaterelectricity

In this post we investigate a couple of quick and efficient methods of generating free electricity from the sea waves which is limitless and an infinite source of energy. Introduction Just like wind and sun, sea is another example of massiveness and a potential raw energy source that may be harnessed for acquiring electrical power. […]

Filed Under: Free Energy Tagged With: Electricity, Generate, Methods, Simple, Water

What is Hysteresis in Electronic Circuits

Last Updated on December 20, 2019 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

Make this Wireless Speaker Circuit

Last Updated on January 8, 2024 by Swagatam 36 Comments

Transmitter 2

In this article I have explained a very simple circuit of a wireless speaker system which can be used for playing hi quality music wirelessly from your TV set, DVD player, Ipod, cell phone or from any music system. The speaker thus can be placed in any corner of the house within a radial distance […]

Filed Under: Audio and Amplifier Projects Tagged With: Speaker, Wireless

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