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23/08/2026

DHT11 digital temperature and humidity sensor module, which operates on a single-wire serial interface.

16/08/2026

Passive components are the basic building blocks of electronic circuits. The three most common types are resistors, inductors, and capacitors.

A resistor opposes current flow and converts electrical energy into heat. Its resistance is measured in ohms (Ω), and Ohm’s law gives the relationship between voltage, current, and resistance: V = IR.

An inductor stores energy in a magnetic field and opposes changes in current. Its value is measured in henries (H). Inductors are commonly used in filters, chokes, power supplies, and energy-storage circuits.

A capacitor stores energy in an electric field and opposes changes in voltage. Its capacitance is measured in farads (F). Capacitors are widely used for filtering, smoothing, timing, coupling, and decoupling.

Understanding how these three components respond to voltage and current is essential for analyzing and designing electronic circuits.

15/08/2026

Control systems are widely used in electronics, automation, robotics, and motor drives to control a desired output. In an open-loop system, such as a TV remote, the command is sent to the TV without measuring whether the desired result was achieved. A closed-loop system, such as DC voltage regulation, measures the output and uses feedback to correct errors. In P control, such as LED brightness control, the control action depends on the size of the error. PI control, commonly used for battery charging and current regulation, adds integral action to reduce steady-state error. PID control, used in applications such as drone attitude control, combines proportional, integral, and derivative actions for faster and more stable correction. Cascade control uses two control loops; for example, a motor drive can use an outer speed loop and a faster inner current loop. Feedforward control measures a disturbance before it affects the system and applies corrective action early, as in active noise cancellation. Understanding these control methods helps us design accurate and stable electronic and automation systems.

11/06/2026

What is

10/06/2026

Let's learn with

04/03/2026

DC-DC converters change one DC level to another using high-frequency switching.
Boost converter: The inductor stores energy when the switch is ON and releases it when OFF, increasing voltage: Vout = Vin / (1 − D).
Uses: battery-powered devices, LED drivers, solar systems, power banks.
Buck converter: The switch controls average output, reducing voltage: Vout = Vin × D.
Uses: microcontrollers, laptops, phone chargers, automotive electronics.

03/03/2026

An NPN transistor amplifier works by using a small base current to control a much larger collector current. That is the core idea.
An NPN transistor has three regions: Emitter (N), Base (P), and Collector (N). The emitter-base junction is forward biased (about 0.7V for silicon), and the collector-base junction is reverse biased in normal amplifier operation (active region).
When a small current flows into the base (IB), electrons are injected from the emitter into the base. Because the base is very thin and lightly doped, most of these electrons move across into the collector. This creates a larger collector current (IC).
Key relationships:
IE = IB + IC
IC ≈ βIB
α = IC / IE
β = IC / IB
α = β / (1 + β)
β = α / (1 − α)
Here, β (beta) is the current gain. If β = 100, then a 1 mA base current produces about 100 mA collector current.
In a common-emitter amplifier, the collector resistor RC converts current changes into voltage changes:
VCE = VCC − IC RC
If IC increases, the voltage drop across RC increases, so VCE decreases. This creates an amplified and inverted output signal at the collector.
Important operating regions: • Cutoff: IB = 0, transistor OFF
• Active: Amplification region
• Saturation: Fully ON, VCE very small
In summary, a tiny input current at the base controls a much larger output current at the collector. The resistor then converts that current variation into a larger voltage variation. That is how signal amplification happens in an NPN transistor.

23/12/2025

Types of Resistors..

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