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Making a Stethoscope Amplifier Circuit

Last Updated on May 15, 2026 by Swagatam 47 Comments

stethescopeamp

In this post I have explained how to make an electronic stethoscope amplifier circuit for enabling a loud audible reproduction of the heart beats which is being diagnosed. The article also reveals how the same can be applied within a cellphone through a wireless circuit. The idea was requested by Dr. Ankit. Main Requirements The […]

Filed Under: Audio and Amplifier Projects Tagged With: Amplifier, Making, Stethoscope

Making an Automatic Stopwatch for Runners, Athletes and Sportpersons

Last Updated on May 21, 2026 by Swagatam Leave a Comment

DSC0410 1

In this post I will show how 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. First let’s begin by learning how to configure […]

Filed Under: Arduino Projects, Games and Sports Projects Tagged With: Athletes, Automatic, Making, Runners, Sportpersons, Stopwatch

Making a Strong RF Discharge Circuit

Last Updated on November 2, 2026 by Swagatam 77 Comments

rfdischargegeneratorcircuit

In this article we study an RF discharge generation concept also called EMP generator capable of producing an intense RF electrical discharge in the air which may have the potentials of paralyzing and permanently damaging all electronic systems in the close vicinity. The idea was requested by Mr. Nidal. Technical Specifications I have seen a […]

Filed Under: Power Supply Circuits Tagged With: Discharge, Making, RF, Strong

Making an Inductive Generator Using two Motors

Last Updated on May 20, 2026 by Swagatam

2

In this post I have explained an over unity generator set up using two motors and an inverter for getting a sustained free energy infinitely. The idea was suggested by Mr. Dare. Technical Specifications I came across your website when searching for on Google, alternator booster which helps small Genset of 650W to bear load […]

Filed Under: Energy from Magnets and Earth Tagged With: Generator, Making, Motors, Overunity

Making a Regulated 9V Battery Eliminator Circuit

Last Updated on November 2, 2026 by Swagatam 4 Comments

9 volts dc battery eliminator circiut 002

The post presents a regulated 9V battery eliminator circuit which was built and investigated by Mr. Steven Chiverton, an avid reader of this blog and an experienced electronic hobbyist. I have explained more from him. 9 volt battery eliminator circuit tests: Circuits built 2x each circuit ive made a small modification to it buy adding […]

Filed Under: Power Supply Circuits Tagged With: Battery, Eliminator, Making, Regulated

Making a Wireless Doorbell Circuit

Last Updated on January 4, 2020 by Swagatam 27 Comments

wireless doorbell transmitter circuit

Today the traditional wired type of doorbells are gradually getting obsolete and are being replaced by the advanced wireless type of doorbells that are easier to install due to their hassle free set-ups. A simple wireless doorbell circuit is discussed in the following post which can be constructed at home. Written and Submitted By: Mantra […]

Filed Under: Wireless Circuits Tagged With: Doorbell, Making, Wireless

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