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

Last Updated on July 16, 2024 by Swagatam 224 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

How to Design an Inverter – Theory and Tutorial

Last Updated on August 3, 2020 by Swagatam 155 Comments

In this post I have explained the fundamental tips and theories which may be useful for the newcomers while designing or dealing with basic inverter concepts. I have explained more. What’s an Inverter It’s a device which converts or inverts a low voltage, high DC potential into a low current high alternating voltage such as […]

Filed Under: Inverter Circuits Tagged With: Design, Inverter, Theory, Tutorial

12V DC to 220V DC Boost Converter Circuit

Last Updated on January 18, 2025 by Swagatam 118 Comments

12v2Bto2B220v2Bboost2Bcircuit2Busing2B5552Bic

In this article I have explained a very simple method of acquiring 220V DC from a 12V DC source. The idea utilizes inductor/oscillator based boost topology with the help of the IC 555. Circuit Operation Referring to the circuit diagram below, we see that the entire idea is based upon the versatile, evergreen IC 555. […]

Filed Under: Power Supply Circuits Tagged With: 12V, 220V, Boost, Converter, DC

High Current Voltage Doubler Circuit

Last Updated on March 12, 2025 by Swagatam 18 Comments

highcurrentvoltagedoublercircuit

In this post I have explained a voltage high current doubler circuit which will almost double the voltage that’s been applied at the input (up to 15V max), and also it becomes specifically useful since it allows higher current loads to be used at the output, in the order 10 amps. Since the voltage doubler […]

Filed Under: Electronics Theory Tagged With: Current, Doubler, High, Voltage

Electronic 12V DC Capacitive Discharge Ignition (CDI) Circuits

Last Updated on February 16, 2021 by Swagatam 304 Comments

enhanced CDI

In the following post I have explained a simple yet enhanced 12V capacitive discharge ignition system which derives its operating voltage from the battery instead of the alternator for generating the igniting sparks. Since it works independently from the alternator voltage, without depending on a pickup coil signal, it is able to function more efficiently […]

Filed Under: Automobile Electronics Tagged With: 12V, Capacitive, DC, Discharge, Electronic, Ignition

300 Watts PWM Controlled Pure Sine Wave Inverter Circuit

Last Updated on August 3, 2020 by Swagatam 122 Comments

pure sine wave inverter with 555 1

The following article which discusses a 300 watt pure sine wave inverter circuit with automatic output voltage correction, is a modified version of one of my previous posts, and was submitted to me by Mr. Marcelin. I have explained more about the converter implementations. The Design The idea was inspired by the design presented in this article […]

Filed Under: Inverter Circuits Tagged With: 300, Controlled, Pure, PWM, Sine, watts

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