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Newly Updated Circuit Projects:

Connecting MPPT with Solar Inverter

Last Updated on August 3, 2020 by Swagatam 12 Comments

MPpT

The small discussion I have I have explained in this article explains whether or not it is advisable to Connect parallel MPPTs with Solar inverters for increasing the net current value of the MPPTs. The question was raised by Mr. Ahmed Qaid Want to Convert Home Inverter to Solar hello sir, I have many questions […]

Filed Under: Solar Controller Circuits Tagged With: Connecting, Inverter, MPPT, Solar

SPDT Relay Switch Circuit using Triac

Last Updated on September 13, 2019 by Swagatam 27 Comments

SPDTtriac 1

An efficient solid state single pole double throw or SPDT switch can be built using triacs for replacing a mechanical SPDT. In this post I have explained a simple solid state triac SPDT relay circuit, using an optocoupler and a couple of triacs, which can be used as an effective replacement for mechanical relays. The […]

Filed Under: Inverter Circuits Tagged With: Relay, SPDT, Switch, Triac

2 Simple Arduino Temperature Meter Circuits Explored

Last Updated on January 19, 2025 by Swagatam 7 Comments

LEDThermometerpic

In this article, I will show how to construct a couple of easy Arduino temperature meter circuits which can be also used as a LED room thermometer circuit. The circuit is designed to display the readings in doted/bar LEDs. This project can be implemented for applications where ambient temperature plays a crucial role or it […]

Filed Under: Sensors and Detectors Tagged With: Arduino, Circuits, Explored, Meter, Simple, Temperature

Switching Two Alternate Loads ON/OFF with IC 555

Last Updated on December 2, 2024 by Swagatam 55 Comments

5552Btimer

In this post I have explained how to make a simple IC 555 based alternate relay timer circuit for toggling a couple of loads alternately with a specified length of delay, as determined by the calculated values of the relevant components. The idea was requested by Mr. Sanjoy. Circuit Objectives and Requirements The Design Referring […]

Filed Under: Timer and Delay Relay Tagged With: 555, Alternate, Loads, OFF, ON, Switching

3 Phase Induction Motor Speed Controller Circuit

Last Updated on June 30, 2026 by Swagatam 248 Comments

In this post I have explained the making of a simple 3 phase induction motor speed controller circuit, which can be also applied for a single phase induction motor or literally for any type of AC motor. When it comes to controlling the speed of induction motors, normally matrix converters are employed, involving many complex […]

Filed Under: Grid and 3-Phase, Motor Controller Tagged With: Controller, Induction, Motor, Phase, Speed

How to Design an Uninterruptible Power Supply (UPS) Circuit

Last Updated on August 4, 2020 by Swagatam 64 Comments

charger

In this brief tutorial I have explained how to design a customized UPS circuit at home using ordinary components such as a few NAND ICs and a some relays. What is an UPS UPS which stands for uninterruptible power supply are inverters designed to provide a seamless AC mains power to a connected load without […]

Filed Under: Inverter Circuits Tagged With: Design, Power, Supply, Uninterruptible, UPS

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