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Simplest Combination Lock Circuit Explained

Last Updated on February 3, 2023 by Swagatam 14 Comments

A electronic combination lock is a device which is designed to activate an electrical solenoid locking system whenever the correct combination of numbers are entered into an attached keypad. To […]

Filed Under: Mini Projects, Security and Alarm

Higher Variable Output Voltage from IC 7812

Last Updated on July 16, 2021 by Swagatam 13 Comments

You may have often wondered whether it was feasible to get higher voltages than 12 V from a 7812 IC? In this short post we learn how to configure the […]



Filed Under: Mini Projects, Power Supply Circuits

Letter Box Open Indicator Circuit

Last Updated on December 2, 2021 by Swagatam 16 Comments

In this post we learn how to build a letter box open indicator circuit, which indicates through an LED if the letter box had been opened either by the postman, […]

Filed Under: Home Electrical Circuits, Mini Projects

Loudspeaker Thump Sound Eliminator Circuit

Last Updated on May 21, 2021 by Swagatam 6 Comments

While using amplifiers, we sometimes experience this very annoying thump sound, popping up in loudspeakers whenever the amplifier is switched ON or OFF. This normally happens with amplifiers that are […]

Filed Under: Mini Projects

Electromagnetic Levitation Circuit [Anti-gravity]

Last Updated on May 3, 2021 by Swagatam 2 Comments

In this post we will learn how to build an electromagnetic levitation circuit which can imitate an anti-gravity phenomenon by ensuring that an iron object remains pulled above the ground […]

Filed Under: Fun Projects, Mini Projects

Universal BJT, JFET, MOSFET Tester Circuit

Last Updated on February 8, 2021 by Swagatam 6 Comments

This useful transistor tester allows the user to quickly check the functionality of an NPN/PNP transistor, JFET or (V)MOSFET as well as determine the orientation of their terminals, or the […]

Filed Under: Meters and Testers, Mini Projects

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