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4 Simple Transformerless Power Supply Circuits Explained

Last Updated on March 27, 2025 by Swagatam 430 Comments

In this post I have explained 4 easy to build, compact simple transformerless power supply circuits. All the circuits presented here are built using capacitive reactance theory for stepping down the input AC mains voltage. All the designs presented here work independently without any transformer, or no transformer. The Transformerless Power Supply Concept As the […]

Filed Under: Power Supply Circuits Tagged With: Circuits, Explained, Power, Simple, Supply, Transformerless

Remote Control Circuit Using FM Radio

Last Updated on May 29, 2025 by Swagatam 42 Comments

Transmitter

In this post I have explained how to build a simple FM remote control circuit for toggling small AC loads such as lamps, fans etc using an ordinary FM transmitter circuit and a modified FM radio circuit. This remote control system enables the user to get an ON/OFF control on any desired appliance, by simply […]

Filed Under: Remote Control Circuits Tagged With: Control, FM, Radio, Remote

How to make a Transistor Latch Circuit

Last Updated on November 18, 2024 by Swagatam 169 Comments

Latch 2

In this post I have explained how to make a simple transistor latch circuit using just two BJTs and a few resistors. Introduction A transistor latch is a circuit which latches ON with a permanent high output in response to a momentary input high signal, and continues to stay in this position as long as […]

Filed Under: Electronics Theory Tagged With: Latch, Transistor

Vehicle Immobilizer Circuit Explained

Last Updated on October 2, 2024 by Swagatam 9 Comments

CarImmobilzer

If you own a car and still haven’t incorporated any security system in it or perhaps your old security system is out of order, you can quickly opt for a cheap yet effective security option for your car or any vehicle by installing the proposed circuit. It will cost you not more than a dollar. […]

Filed Under: Automobile Electronics Tagged With: Explained, Immobilizer, Vehicle

5 Simple Water Level Controller Circuits

Last Updated on November 18, 2024 by Swagatam 203 Comments

An automatic water level controller is a device which senses undesired low and high water levels in a tank, and switches a water pump ON or OFF accordingly to maintain an optimal water content in the tank. In this article I have explained 5 simple automatic water level controller circuits which can be used for […]

Filed Under: Water Controller Tagged With: Circuits, Controller, Level, Simple, Water

Make this Simple Buzzer Circuit with Transistor and Piezo

Last Updated on March 9, 2025 by Swagatam 87 Comments

In this article I have explained how to make a very simple circuit for buzzer using piezo electric transducer, two resistors, a small coil and a BC547 transistor. A buzzer is a high frequency oscillator circuit used for generating a buzzing sound through a transducer or speaker output. Simple Buzzer using a Single Transistor Just […]

Filed Under: Audio and Amplifier Projects Tagged With: Buzzer, Piezo, Simple, Transistor

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