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4 Simple Li-Ion Battery Charger Circuits – Using LM317, NE555, LM324

Last Updated on July 16, 2024 by Swagatam 216 Comments

simplestli ionbatterychargercircuit

In this post I have explained a four simple yet a safe way of charging a Li-ion battery using ordinary ICs like LM317 and NE555 which can be easily constructed at home by any new hobbyist. Although Li-Ion batteries are vulnerable devices, these can be charged through simpler circuits if the charging rate does not […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Circuits, LM317, NE555, Simple

Sequential Bar Graph Turn Light Indicator Circuit for Car

Last Updated on January 8, 2024 by Swagatam 167 Comments

SequentialLEDPart2

The article illustrates a simple yet innovative, fancy car turn signal light circuit which produces a rising bar graph sequence effect when switched ON. The circuit idea was requested by Mr. +Bruce Lowry. I have explained more. Technical Specifications I am after a circuit design similar to the LED Bar Graph circuit that is found […]

Filed Under: Automobile Electronics Tagged With: Graph, Indicator, Light, Sequential, Turn

Simple PIR LED Lamp Circuit

Last Updated on January 8, 2024 by Swagatam 121 Comments

pir light activated sensor circuit

The following PIR LED lamp circuit was designed by me for one of the followers of this blog Mr.Deepak upon his request. The circuit is a LED driver which responds to ambient light as well as to the presence of a human, person or intruder, and varies its illumination accordingly, let’s know more. Technical Specifications “I was looking to […]

Filed Under: Lamps and Lights Tagged With: Lamp, LED, PIR, Simple

Transformerless Current-Controlled LED Bulb Circuits you can Build at Home

Last Updated on December 30, 2024 by Swagatam 274 Comments

In this post I have elaborately explained how to build simple transformerless LED bulb circuits using many LEDs in series and powering them through current controlled capacitive power supply circuit. Warning: Circuits I have explained below are not isolated from mains AC, and therefore are extremely dangerous to touch in the powered and open condition. […]

Filed Under: Lamps and Lights Tagged With: Bulb, Circuits, Controlled, Current, LED, Transformerless

How to Make a Simple 12 Volt LED Lantern Circuit

Last Updated on January 2, 2024 by Swagatam 37 Comments

LEDlanterncircuit

In this post I have explained how to build a simple 12V LED lantern circuit which may be used at night while travelling and outings such as in picnics, trekking, or camping etc. Introduction So far we have discussed white LEDs comprehensively through many of my earlier articles and have learned how efficient these lights […]

Filed Under: Lamps and Lights Tagged With: Lantern, LED, Simple, Volt

3 Glittering LED Christmas Tree Light Circuits Explored

Last Updated on January 20, 2025 by Swagatam 34 Comments

Flasher4060 1 compressed

In this post we present 3 circuit ideas for creating beautiful Christmas tree light decorations. The first idea explains a transistorized flashing blinking LED string light which can be mounted on a Christmas tree. The second circuit diagram describes an LED light effect generator which can be also installed over a real Christmas tree for […]

Filed Under: Mini Projects Tagged With: Christmas, Circuits, Glittering, LED, Light, Tree

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