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Newly Updated Circuit Projects:

How to Use Resistors with LED, Zener and Transistor

Last Updated on May 20, 2026 by Swagatam 56 Comments

circuit2

In this post I have explained how to use resistors while designing an electronic circuits using LEDs, zener diodes, or transistors. This article can be very useful for the new hobbyists who normally get confused with the resistor values to be used for a specific component and for the desired application. What is a Resistor […]

Filed Under: Electronics Theory Tagged With: LED, Resistors, Transistor, Zener

Battery Current Indicator Circuit – Current Triggered Charging Cut off

Last Updated on June 1, 2026 by Swagatam 32 Comments

In this post I have explained about a simple battery current sensor with indicator circuit which detects the amount of current consumed by the battery while charging. The presented designs also have an auto cut off when the battery stops consuming current at its full charge level.. Why Current Drops as Battery gets Charged We […]

Filed Under: Indicator Circuits Tagged With: Battery, Charging, Current, Indicator, Triggered

MPPT vs Solar Tracker – Differences Explored

Last Updated on July 15, 2019 by Swagatam 7 Comments

solar tracker ldr assembly

The post investigates two popular solar harnessing counterparts the MPPT and the solar tracker, and figures out the major differences between these two outstanding radiant energy spinning devices. It’s true that our planet is blessed with many radiant energy sources such as wind energy, hydro energy, sun or solar energy etc but unless these are […]

Filed Under: Solar Controller Circuits Tagged With: Differences, Explored, MPPT, Solar, Tracker

High Current Li-Ion Battery Charger Circuit

Last Updated on May 17, 2026 by Swagatam 205 Comments

universalli ionchargercircuit

In this post I have explained a high current Li-Ion battery charger circuit which can be used for charging any high current, such as 2S3P, 3S2P battery packs. It can be also used for charging other similar high Ah rated Li-ion battery from a car or a truck battery. The idea was requested by Mr. […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Current, High

220V/120V LED String Light Circuit using a Single Capacitor

Last Updated on June 8, 2026 by Swagatam 67 Comments

ACledstring

In this post I have explained how to make a LED string light which can be operated from 220V mains through a single inexpensive PPC capacitor. The idea was requested by Mr. Basit Momin.WE STRICTLY CAUTION YOU THAT YOU BUILD THIS CIRCUIT ONLY IF YOU ARE AWARE OF THE DANGERS OF MAINS AC AND KNOW […]

Filed Under: Lamps and Lights Tagged With: 120V, 220V, LED, Light, Single, String

LPG Gas Leakage Detector Alarm Circuit

Last Updated on September 24, 2026 by Swagatam 7 Comments

MQ 6

Are you feeling vulnerable or suspecting a possible LPG gas leakage in your house? Then may be this gas leakage alarm circuit might help you. Written by: Sai Srinivas The Concept This circuit is a simple solution for detecting LPG gas leakage in households which causes severe physical and monetary losses if left unattended for […]

Filed Under: Security and Alarm Tagged With: Alarm, Detector, Leakage, LPG

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