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Newly Updated Circuit Projects:

2 Simple Automatic Transfer Switch (ATS) Circuits

Last Updated on May 21, 2026 by Swagatam 107 Comments

automatictransferswitchcircuit

In this article we investigate an ATS circuit for initiating an automatic changeover from mains supply to generator supply through many intermediate transfer stages which involves activating the fuel valve, choke valve and the generator starter. The circuit was requested by Mr. Hari, and another dedicated reader from this blog. Requirement for 5kva LPG Generator […]

Filed Under: Grid and 3-Phase Tagged With: ATS, Automatic, Circuits, Simple, Switch, Transfer

Make a Simple Class D Amplifier Circuit

Last Updated on May 15, 2026 by Swagatam 57 Comments

class D amplifier circuit

In this article I have explained two simple class-D amplifier projects which can be built at home with extremely high efficiency results. A Class D amplifier is also known as switching amplifier. This technology uses pulse width modulation or PWM for digitally amplifying small analogue music signals into high power, high efficiency audio signals. Why […]

Filed Under: Audio and Amplifier Projects Tagged With: Amplifier, Class, Simple

2 Simple Induction Heater Circuits – Hot Plate Cookers

Last Updated on August 31, 2026 by Swagatam 413 Comments

royerinductionheatercircuit

In this post I have explained 2 easy to build induction heater circuits which work with high frequency magnetic induction principles for generating substantial magnitude of heat over a small specified radius. The discussed induction cooker circuits are truly simple and uses just a few active and passive ordinary components for the required actions. Update: You […]

Filed Under: Temperature Controllers Tagged With: Circuits, Cookers, Heater, Induction, Plate, Simple

Simple TV Transmitter Circuit (Audio and Video Combined)

Last Updated on November 24, 2024 by Swagatam 20 Comments

TVtransmittercircuit

The TV transmitter circuit presented in this post incorporates the European standard FM frequency for audio and Video up-links. Referring to the circuit below, Q1 is configured as a preamplifier for amplifying the audio input to be modulated. Circuit  Description Q2 is fundamentally responsible for conducting a couple of important functions: It amplifies the carrier frequency […]

Filed Under: Wireless Circuits Tagged With: Audio, Combined, Simple, Transmitter, TV, Video

Multi-spark CDI Circuit

Last Updated on May 16, 2026 by Swagatam 108 Comments

multispark cdi circuit

In this post I have explained an enhanced multi-spark CDI circuit which is universally suited for all types of automobiles. The unit can be built at home and installed in a particular vehicle for achieving greater speed to fuel efficiency. The Circuit Concept The following diagram illustrates an enhanced version of a multi-spark CDI circuit. […]

Filed Under: Automobile Electronics Tagged With: CDI, Multi, spark

Simple FM Radio Circuit Using a Single Transistor

Last Updated on September 21, 2026 by Swagatam 228 Comments

When it comes to making an FM receiver it’s always thought to be a complex design, however the one transistor simple FM receiver circuit explained here simply shows that it isn’t the case after all. Here a single transistor acts as a receiver, demodulator, amplifier to constitute a wonderful tiny FM radio. It’s basically based […]

Filed Under: Audio and Amplifier Projects Tagged With: FM, Radio, Simple, Single, Transistor

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