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Unijunction Transistor (UJT) – Comprehensive Tutorial

Last Updated on June 1, 2021 by Swagatam 1 Comment

A unijunction transistor is a 3 terminal semiconductor device which is unlike a BJT has only a single pn junction. It is basically designed to be used as a single-stage […]

Filed Under: Electronic Components, Electronic Devices and Circuit Theory, Electronics Tutorial

Solid State Relay (SSR) Circuit using MOSFETs

Last Updated on March 10, 2022 by Swagatam 163 Comments

SSR or Solid state relays are high power electrical switches that work without involving mechanical contacts, instead they use solid state semiconductors like MOSFETs for switching an electrical load. SSRs […]



Filed Under: Electronic Devices and Circuit Theory, Electronics Tutorial

Calculating Transistor as a Switch

Last Updated on April 30, 2022 by Swagatam 15 Comments

Although transistors (BJTs) are popularly used for making amplifier circuits, these can be also effectively used for switching applications. A transistor switch is a circuit in which the collector of […]

Filed Under: Electronic Devices and Circuit Theory

Photodiode, Phototransistor – Working and Application Circuits

Last Updated on October 5, 2019 by Swagatam 16 Comments

Photodiodes and phototransistors are semiconductor devices which have their p-n semiconductor junction exposed to light through a transparent cover, so that external light can react and force an electrical conduction […]

Filed Under: Electronic Devices and Circuit Theory, Electronics Tutorial, Infrared (IR), Mini Projects, Security and Alarm, Sensors and Detectors

Optocouplers – Working, Characteristics, Interfacing, Application Circuits

Last Updated on March 24, 2023 by Swagatam 29 Comments

OPTOCOUPLERS OR OPTOISOLATORS are devices that enable efficient transmission of DC signal and other data across two circuit stages, and also simultaneously maintain an excellent level of electrical isolation between […]

Filed Under: Electronic Components, Electronic Devices and Circuit Theory, Electronics Tutorial

Triacs – Working and Application Circuits

Last Updated on March 8, 2023 by Swagatam 31 Comments

A triac can be compared to a latching relay. It will instantly switch ON and close as soon as it’s triggered, and will remain closed as long as the supply […]

Filed Under: Datasheets, Electronic Devices and Circuit Theory, Electronics Tutorial



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