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Newly Updated Circuit Projects:

How to Build a 220V DC Inverter UPS Circuit

Last Updated on June 18, 2022 by Swagatam 15 Comments

In this post I have explained a simple 220 V to 220V DC online UPS inverter circuit. The idea was requested by Mr. Taiye. Technical Specifications I intend to build a 1000 watt UPS with a different concept (inverter with high voltage input dc). I will use a battery bank of 18 to 20 sealed […]

Filed Under: Inverter Circuits Tagged With: 220V, Build, DC, Inverter, UPS

Infrared Remote Controlled Door Lock Circuit

Last Updated on June 1, 2020 by Swagatam 22 Comments

IRdoorlockcircuit

In this article I have explained about a simple infrared remote controlled door lock circuit which can be used for securely locking doors through unique foolproof IR frequencies. The proposed infrared remote controlled door lock circuit can be used for locking your main door, gate, garage door, shop or any entrance which may need a […]

Filed Under: Remote Control Circuits, Security and Alarm Tagged With: Controlled, Door, Infrared, Lock, Remote

Battery Charging Fault Indicator Circuit

Last Updated on May 17, 2026 by Swagatam 130 Comments

li ionfaultindicator

In this article I have explained a battery status indicator circuit which can be also used as a battery charging fault indicator circuit. The idea was requested by Mr. Faizan. The Design The idea presented here takes care of all the parameters required for charging a battery ideally and safely. Referring to the shown battery […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charging, Fault, Indicator

Making a Strong RF Discharge Circuit

Last Updated on August 13, 2023 by Swagatam 77 Comments

rfdischargegeneratorcircuit

In this article we study an RF discharge generation concept also called EMP generator capable of producing an intense RF electrical discharge in the air which may have the potentials of paralyzing and permanently damaging all electronic systems in the close vicinity. The idea was requested by Mr. Nidal. Technical Specifications I have seen a […]

Filed Under: Power Supply Circuits Tagged With: Discharge, Making, RF, Strong

How to Interface Arduino PWM with any Inverter

Last Updated on August 3, 2020 by Swagatam 8 Comments

arduinoinvertercircuit

In this post I have explained how to interface an existing Arduino PWM signal with any inverter to convert it into a sine wave equivalent inverter. The idea was requested by Mr. Raju Visshwanath Technical Specifications I am in need of following inverter circuit designs: Single phase DC to AC inverter. Input 230 VDC. PWM […]

Filed Under: Inverter Circuits Tagged With: Arduino, Interface, Inverter, PWM

Simple Digital Stopwatch Circuit (4-Digit)

Last Updated on May 21, 2026 by Swagatam 50 Comments

stopwatchcircuit

In this article we’ll study a digital stopwatch design configured around the very popular IC LM555 in conjunction with a 4-digit counter IC with multiplexed 7-segment output drivers (MM74C926). Written and Submitted by: Jennifer Goldy Circuit Operation IC MM74C926 is internally made up of a 4-digit counter, an output latch up stage, a npn output […]

Filed Under: Games and Sports Projects Tagged With: Digit, Digital, Simple, Stopwatch

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