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Newly Updated Circuit Projects:

LED Fader Circuit – Slow Rise, Slow Fall LED Effect Generator

Last Updated on June 1, 2026 by Swagatam 59 Comments

LED fader circuit 1

In the following post I have explained a simple circuit which can be used for alternately switching LEDs with gradual brightening and fading effects. Circuit Operation The circuit can be effectively used for generating spooky effects in idols, for example it can be used for illuminating the eyes of a Jack-o’-lantern during haloween celebrations. The […]

Filed Under: Lamps and Lights Tagged With: Effect, Fader, Fall, LED, Rise, Slow

How to Generate PWM Using IC 555 (2 Methods Explored)

Last Updated on May 20, 2026 by Swagatam 93 Comments

oscillator 555 50 duty cycle 080261320

The IC 555 is an extremely useful and versatile device which can be applied for configuring many useful circuits in the field of electronics. One very useful feature of this IC is its ability to generate PWM pulses which can be dimensioned or processed as per the needs of the application or the circuit. What’s […]

Filed Under: Electronics Theory Tagged With: 555, Explored, Generate, Methods, PWM

Single Transformer Inverter/Charger Circuit

Last Updated on May 17, 2026 by Swagatam 243 Comments

singletransformerinverterchargerchangeovercircuit

In this post I have explained how to build an innovative inverter circuit with a single transformer that works both as an inverter and a battery charger transformer, I have explained the details from the following discussion. The Circuit Objective Though you may find many inverters having an integral battery charger, the section will mostly […]

Filed Under: Battery Charger Circuits Tagged With: Charger, Inverter, Single, Transformer

Single Phase Preventor Circuit

Last Updated on May 21, 2026 by Swagatam 6 Comments

simplesinglephasingpreventercircuit

In this post I have explained a couple simple circuits which when installed will prevent single phase occurrence in a 3 phase system. Introduction We all know that for operating heavy electrical loads three phase power or AC is required in order to make the functioning efficient and viable. However this necessitates the presence of all the three phases […]

Filed Under: Grid and 3-Phase Tagged With: Phase, Preventor, Single

How Shunt Regulator TL431 Works, Datasheet, Application

Last Updated on July 18, 2026 by Swagatam 85 Comments

TL431 shunt regulator circuit

In this post I have explained how a shunt regulator IC works typically in SMPS circuits. We take the example of the popular TL431 device and try to understand its use in electronic circuits through a few of its application notes. Electrical Specifications Technically the device TL431 is called a programmable shunt regulator, in simple […]

Filed Under: Datasheets and Components Tagged With: Application, Datasheet, Regulator, Shunt, TL431, Works

Automatic Door Lamp Timer Circuit

Last Updated on June 1, 2026 by Swagatam Leave a Comment

automaticdoorlampcircuit

In this article I have explained a simple automatic door light timer circuit which activates every time the door is opened, and switches OFF after a predetermined time if the door is kept open for too long. The circuit was requested by one of the avid readers of this blog, Mr. Juan. I have explained more. Technical Specifications: I always find […]

Filed Under: Lamps and Lights, Timer and Delay Relay Tagged With: Automatic, Door, Lamp, Timer

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