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Newly Updated Circuit Projects:

BJT Emitter-Follower – Working, Application Circuits

Last Updated on May 20, 2026 by Swagatam 12 Comments

In this post I have explained how to use a transistor emitter follower configuration in practical electronic circuits, we study this through a few different example application circuits. An emitter follower is one of the standard transistor configurations which is also referred to as common collector transistor configuration. Let’s try to first understand what’s an […]

Filed Under: Electronics Theory Tagged With: Application, BJT, Circuits, Emitter, Follower, Working

Understanding PID Controller

Last Updated on May 20, 2026 by Swagatam 4 Comments

PID

The first successful assessment of PID control theory was practically verified in the field of automatic steering systems for ships, way back around the year 1920. After this it was applied in various industrial automatic process controls requiring optimized and accurate manufacturing output specifications. For manufacturing units PID was popularly implemented for achieving precise pneumatic […]

Filed Under: Electronics Theory Tagged With: Controller, PID, Understanding

Understanding Pull-Up and Pull-Down Resistors with Diagrams and Formulas

Last Updated on May 20, 2026 by Swagatam 2 Comments

calculation

In this post I am going to explain pull-Up resistor and pull-down resistor, why they are commonly used in electronic circuits, what happens to electronic circuits without Pull-Up or Pull-down resistor, and How to calculate Pull-Up and Pull-down resistor values and finally we will see about open collector configuration. How Logic Inputs and Outputs Work […]

Filed Under: Electronics Theory Tagged With: Diagrams, Down, Formulas, Pull, Resistors, Understanding

What is Constant Current Source – Facts Explained

Last Updated on May 20, 2026 by Swagatam 31 Comments

CC CV

In this post I will try to analyze what is constant current source and how it affects a load, or how it may be used with a load correctly for achieving the most efficient results. The following discussion between me and Mr. Girish will clearly explain what is CC or how constant current operates. How […]

Filed Under: Electronics Theory Tagged With: Constant, Current, Explained, Facts, Source

How to Make a Zero Crossing Detector Circuit

Last Updated on May 20, 2026 by Swagatam 31 Comments

Making a zero crossing detector circuit is actually very easy and it could be effectively applied for protecting sensitive electronic equipment against mains switch ON surges. A zero crossing detector circuit is mainly used for protecting electronic devices from switch ON surges by ensuring that during power switch ON the mains phase always “enters’ the […]

Filed Under: Electronics Theory Tagged With: Crossing, Detector, Zero

How Electret Microphones Work – Full Tutorial and Diagram

Last Updated on May 20, 2026 by Swagatam 16 Comments

electret

In this post I have explained how electret microphone devices work, through appropriate diagrams and formulas. What’s a Microphone A microphone is a device designed for transforming weak sound vibrations into tiny electrical pulses, which can be then amplified through a power amplifier over a loudspeaker for achieving a louder reproduction of the sound. The […]

Filed Under: Electronics Theory Tagged With: Electret, Full, Microphones, Tutorial, Work

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