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Electronics Theory

How to Connect a TSOP1738 IR Sensor

Last Updated on January 30, 2026 by Swagatam 74 Comments

TSOP17XX series devices are advanced infrared sensors having a specified center frequency of operation which makes their detection extremely reliable and foolproof. In this post I have explained how to connect a TSOP series infrared sensor and use it for a specified IR remote control operations. TSOP IR Sensor Specifications A TSOP series of IR […]

Filed Under: Electronics Theory, Sensors and Detectors Tagged With: Connect, IR, Sensor, TSOP1738

How To Use And Program ATmega Microcontrollers From Scratch Without Arduino

Last Updated on January 14, 2026 by Swagatam

ATmega microcontrollers, they are coming from the AVR family which Atmel developed long back, and later this Atmel company was taken by Microchip. So now officially Microchip owns it but still people say Atmel AVR only. These MCUs became very popular slowly because they are easy to understand, quite affordable, stable in long run and […]

Filed Under: Arduino Projects, Electronics Theory Tagged With: Arduino, ATmega, Microcontrollers, Program, Scratch, without

Solid State Relay (SSR) Circuit using Two MOSFETs

Last Updated on November 28, 2025 by Swagatam 200 Comments

SSR concept

SSR or Solid state relays are high power electrical switches that work without involving mechanical contacts, instead they use just a couple of solid state semiconductors like MOSFETs for switching an electrical load, smoothly, and with high efficiency. SSRs can be used for operating high power loads, through a small input trigger voltage with negligible […]

Filed Under: Electronics Theory Tagged With: MOSFETs, Relay, Solid, SSR, State

DPDT Relay Working, Pinouts, Testing Explained

Last Updated on October 18, 2025 by Swagatam 2 Comments

In this post we are going to understand about how this DPDT relay actually works, how we identify its pinouts, and how we can use it in our projects. We shall go step by step so that you can feel confident with every small thing about it. Introduction We know that a DPDT relay means […]

Filed Under: Electronics Theory Tagged With: DPDT, Explained, Pinouts, Relay, Testing, Working

How a Relay Works – How to Connect N/O, N/C Pins

Last Updated on October 16, 2025 by Swagatam 81 Comments

how to connect a 6 pin relay

An electrical relay consists of a electromagnet and a spring loaded changeover contacts. When the electromagnet is switched ON/OFF with a DC supply, the spring loaded mechanism is corresponding pulled and released by this electromagnet, enabling a changeover across the end terminals of these contacts. An external electrical load connected across these contacts are subsequently […]

Filed Under: Electronics Theory Tagged With: Connect, Pins, Relay, Works

Making a Time Machine – Concept Explored

Last Updated on October 16, 2025 by Swagatam 3 Comments

Wondering how to travel in time? Learn it with great Sir Stephen Hawking, according to whom time warp may be an option but seems pretty impractical, the reason being the feed back loop which will just oppose the feasibility of making a time machine and the concept using this theory. Are you intrigued by the […]

Filed Under: Electronics Theory Tagged With: Concept, Explored, Machine, Making, Time

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