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Newly Updated Circuit Projects:

LED Strobe Light Circuit with Chasing, Flashing Effects

Last Updated on June 1, 2026 by Swagatam 36 Comments

simplestrobelightcircuit

The proposed LED strobe light circuit will not only flash a group of LEDs with strobe pulses, but will also create a sequentially chasing effect over the strobing LEDs. You might be quite familiar with colorful LED strobe lights, and should have seen them pretty commonly in parties and discotheques. Let’s see how we can […]

Filed Under: Lamps and Lights Tagged With: Chasing, Effects, Flashing, LED, Light, Strobe

Self Regulating Battery Charger Circuit

Last Updated on May 17, 2026 by Swagatam 263 Comments

In this post I have explained how a neat little self regulating automatic battery charger circuit can be made using just two inexpensive transistors. This circuit will automatically regulate the charging supply to the battery depending on its charge level, by switching the input supply ON and OFF periodically. How it Works As can be […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Regulating, Self

High Current Lead Acid Battery Charger Circuits: 100 Ah to 200 Ah Range

Last Updated on September 5, 2026 by Swagatam 324 Comments

highcurrentbatterycharegrcircuit

The lead acid battery charger circuits I have explained in this article can be used for charging all types of lead acid batteries at a specified rate. This article explains a few lead acid battery charger circuits with automatic over charge, and low discharge cut off. All these designs are thoroughly tested and can be […]

Filed Under: Battery Charger Circuits Tagged With: Acid, Battery, Charger, Circuits, Lead

20 Watt Fluorescent Tube Light Circuit with 12V Battery Operation

Last Updated on June 1, 2026 by Swagatam 22 Comments

EmergencyLightSchematics

This simple 20 watt home tube light circuit will work with any 12V battery and uses very few components yet is able to produce a reasonable amount of white light. The components used are very common and can be easily procured from the local electronic retailer. The idea is simple, the secondary winding of Tr1 […]

Filed Under: Lamps and Lights Tagged With: 12V, Battery, Fluorescent, Light, Tube, Watt

How to Make Powerful Car Headlights Using LEDs

Last Updated on May 16, 2026 by Swagatam 17 Comments

4 pin LED

In this post we see how to build an enhanced and efficient car headlight lamp using Pirhana LEDs. A car LED headlight is a powerful lamp built using high efficiency LED arrays, which creates extremely powerful headlight lamp for the car, along with a very high efficiency in terms power consumption. Using 4-pin Pirhana LEDs […]

Filed Under: Automobile Electronics Tagged With: Headlights, LEDs, Powerful

4 Simple Transformerless Power Supply Circuits Explained

Last Updated on December 24, 2025 by Swagatam 440 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

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