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Electronics Theory

How to Protect MOSFETs – Basics Explained

Last Updated on May 20, 2026 by Swagatam 76 Comments

howtostopmosfetfromburning

In this post I will comprehensively explain how to protect mosfets and prevent mosfet burning in electronic circuits by following some basic guidelines related to correct PCB layout, and careful manual handling of these sensitive devices. Introduction Even after connecting everything correctly you find the mosfets in your circuit becoming HOT and blowing off within […]

Filed Under: Electronics Theory Tagged With: Basics, Explained, MOSFETs, Protect

Simple Buck-Boost Converter Circuits Explained

Last Updated on May 20, 2026 by Swagatam 154 Comments

buckboost

In this post I have explained s few simple DC to DC buck-boost converter circuits which can be used for either stepping up the input DC voltage or stepping down the input DC voltage to specific output DC voltage levels. Since a buck-boost converter allows the input voltage to be either stepped up or stepped […]

Filed Under: Electronics Theory Tagged With: Boost, Buck, Circuits, Converter, Explained, Simple

High Current Voltage Doubler Circuit

Last Updated on May 20, 2026 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

How to Connect a Relay through an Opto-Coupler

Last Updated on May 20, 2026 by Swagatam 56 Comments

opto coupler relay driver circuit

In the following post I have explained how to drive a relay by using an isolated method, or through an optocoupler device. We will learn three methods, first method is by connecting relay directly with the optocoupler output pins, second method is by using external PNP transistors, and third method is by using external NPN […]

Filed Under: Electronics Theory Tagged With: Connect, Coupler, Opto, Relay, through

Understanding SG3525 IC Pinouts

Last Updated on May 20, 2026 by Swagatam 336 Comments

sg3525 ic pin out explained

In this article I have explained the pinout functions of the IC SG3525 which is a regulating pulse width modulator IC. So I have explained in details: Main Technical Features The main features of the IC SG3525 may be understood with the following points: Pinout Diagram of the IC SG3525 PinOut Description A practical implementation […]

Filed Under: Electronics Theory Tagged With: Pinouts, SG3525, Understanding

How to Generate PWM Using IC 555 (2 Methods Explored)

Last Updated on May 20, 2026 by Swagatam 93 Comments

oscillator 555 50 duty cycle 080261320

The IC 555 is an extremely useful and versatile device which can be applied for configuring many useful circuits in the field of electronics. One very useful feature of this IC is its ability to generate PWM pulses which can be dimensioned or processed as per the needs of the application or the circuit. What’s […]

Filed Under: Electronics Theory Tagged With: 555, Explored, Generate, Methods, PWM

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