Learn Electronic Components
From diodes to microchips, resistors to transistors: we explain what components are, how they work and where they're used in plain language. Find the part you learned about in our catalog with one click.
Amplifiers & Op-Amps
What Is an Op-Amp (Operational Amplifier)?
An op-amp is a versatile IC that amplifies the difference between two inputs with very high gain. Learn how it works and its uses.
What Is a Comparator?
A comparator is an IC that compares two voltages and reports which is larger with a digital output. Learn how it differs from an op-amp.
What Is an Instrumentation Amplifier?
An instrumentation amplifier amplifies small difference signals with high accuracy. Learn how it works and its uses.
What Is an Audio Amplifier?
An audio amplifier raises a weak audio signal to the power needed to drive a speaker. Learn its classes and uses.
What Is a Differential Amplifier?
A differential amplifier amplifies the difference between two inputs and rejects the common signal. Learn how it works and its uses.
Capacitors
What Is a Capacitor?
A capacitor is a basic passive component that stores electric charge. Learn how it works, the unit of capacitance (farad), its types and its uses with examples.
What Is a Ceramic Capacitor (MLCC)?
A ceramic capacitor (MLCC) is the most common, cheapest capacitor, using a ceramic dielectric. Learn the Class 1/2 difference, its advantages and the DC bias effect.
What Is an Electrolytic Capacitor?
An electrolytic capacitor is a polarized type offering high capacitance. Learn its structure, the importance of polarity, its lifetime and its role in power filtering.
What Is a Tantalum Capacitor?
A tantalum capacitor is a polarized type offering stable, high capacitance in a small size. Learn how it differs from electrolytic, its advantages and explosion risk.
What Is a Film Capacitor?
A film capacitor is a stable, low-loss, non-polarized type using a plastic film dielectric. Learn its types, advantages and uses.
What Is a Mica Capacitor?
A mica capacitor is a very stable, precise type using a mica dielectric that performs well at high frequency. Learn its advantages, limits and RF use.
What Is a Polymer Capacitor?
A polymer capacitor uses a solid conductive polymer electrolyte, giving very low ESR and long life. Learn how it differs from electrolytic/tantalum and its advantages.
What Is a Supercapacitor?
A supercapacitor offers very high capacitance at the farad level, an energy store between a battery and a capacitor. Learn how it differs from a battery and its uses.
What Is a Variable / Trimmer Capacitor?
A variable (trimmer) capacitor has a capacitance that can be adjusted by hand. Learn how it works, its types and RF tuning/calibration use.
What Is ESR? Why Does It Matter in a Capacitor?
ESR (equivalent series resistance) is a capacitor's internal resistance. Learn why it causes heating/loss, which types have low ESR and where it matters.
Clock & Timing
What Is a 555 Timer?
The 555 is a classic timer IC used for timing, delay and square-wave generation. Learn how it works and its uses.
What Is a Real-Time Clock (RTC)?
An RTC is a special timer chip that keeps the date and time even when power is lost. Learn how it works and its uses.
What Is a Clock Generator?
A clock generator is a chip that produces the stable clock signals digital systems need. Learn how it works and its uses.
What Is a PLL (Phase-Locked Loop)?
A PLL is a circuit that locks an output signal to the phase and frequency of a reference signal. Learn how it works and its uses.
Coils & Inductors
What Is an Inductor (Coil)?
An inductor (coil) is a passive component that stores energy in a magnetic field and resists changes in current. Learn how it works and where it's used.
What Is a Power Inductor?
A power inductor carries high current and stores energy in power converters. Learn about saturation current and selection criteria.
What Is an RF Inductor?
An RF inductor is a low-loss inductor used at high frequencies. Learn the Q factor, self-resonant frequency and its uses.
What Is a Ferrite Bead?
A ferrite bead is a small component that suppresses high-frequency noise by turning it into heat. Learn its role in EMI filtering.
What Is a Choke?
A choke is an inductor that blocks AC/high frequency while passing DC. Learn how it works and its role in filtering.
What Is a Common Mode Choke?
A common mode choke suppresses common noise on two lines while passing the wanted signal. Learn its role in EMI filtering.
Connectors
What Is a Connector?
A connector is a component that joins two electrical parts in a detachable way. Learn its types and selection criteria.
What Is a Header / Pin Header?
A pin header is the most common board connector, made of rows of pins on a 2.54 mm pitch. Learn its structure and uses.
What Is a Terminal Block?
A terminal block is a detachable connector that connects wires by clamping them with a screw. Learn its types and uses.
What Is a USB Connector?
A USB connector is the physical connection part of the USB interface. Learn its types like Type-A, Type-C and Micro.
What Is a D-Sub Connector?
A D-Sub connector is a classic multi-pin connector known for its D-shaped metal shell. Learn it with the DB9, DB25 and VGA examples.
What Is a Circular Connector?
A circular connector is a robust industrial connector with a round body and screw/bayonet lock. Learn its types and uses.
What Is an RF Connector (SMA / BNC / U.FL)?
An RF connector carries high-frequency signals with minimal loss and is impedance-controlled. Learn the SMA, BNC and U.FL types.
What Is an FFC / FPC Connector?
An FFC/FPC connector connects thin flexible flat cables to a board with a fine pitch. Learn its structure and uses.
What Is a Board-to-Board Connector?
A board-to-board connector joins two PCBs stacked or side by side without cables. Learn its types and uses.
What Is a DC Barrel Jack?
A DC barrel jack is the cylindrical connector used for adapter power input. Learn its structure and polarity.
What Is an IC Socket?
An IC socket lets an integrated circuit be inserted and removed without soldering. Learn its types and benefits.
Crystals & Oscillators
What Is a Crystal (Quartz)?
A crystal (quartz) is a piezoelectric component that produces a very stable frequency reference. Learn how it works and where it's used.
What Is an Oscillator?
An oscillator is a circuit or module that produces a continuous, regular signal (usually square or sine). Learn how it works and its types.
What Are TCXO / OCXO / VCXO?
TCXO, OCXO and VCXO are special crystal oscillator types with improved stability. Learn their differences and uses.
What Is a Ceramic Resonator?
A ceramic resonator is a frequency reference cheaper than a crystal but less stable. Learn how it works and its uses.
What Is a SAW Filter?
A SAW filter is an RF component that passes a specific frequency band using surface acoustic waves. Learn how it works and its uses.
Data Converters
What Is an ADC (Analog-to-Digital Converter)?
An ADC is a circuit that converts a continuous analog signal into digital values. Learn its types (SAR, sigma-delta), resolution and uses.
What Is a DAC (Digital-to-Analog Converter)?
A DAC is a circuit that converts digital values into an analog voltage. Learn its types, resolution and use in audio/control.
What Is a Digital Potentiometer?
A digital potentiometer is a component whose resistance can be set electronically. Learn how it works and where it's used.
What Are Sampling Rate and Resolution?
The sampling rate states how many times per second a signal is measured, and resolution states the fineness of each measurement. Learn both.
Diodes
What Is a Diode?
A diode is a basic semiconductor component that passes current in only one direction. Learn how it works, its types, the forward voltage drop and its uses with examples.
What Is a Zener Diode?
A Zener diode is a special diode that conducts in reverse at a set voltage, holding the voltage steady. Learn how it works, the regulator circuit and selection criteria.
What Is a Schottky Diode?
A Schottky diode is a diode type offering a very low forward voltage drop and high switching speed. Learn how it differs from an ordinary diode, its advantages and its limits.
What Is a Rectifier Diode?
A rectifier diode is a power diode that converts alternating current (AC) into direct current (DC). Learn the logic of rectification, half/full wave and its role in a power supply.
What Is a Bridge Rectifier?
A bridge rectifier is a circuit that performs full-wave rectification with four diodes. Learn how it works, its advantage over half-wave and getting DC with filtering.
What Is an LED (Light Emitting Diode)?
An LED is a diode that emits light when current flows in the forward direction. Learn how it works, the color–voltage relationship, the current-limiting resistor and polarity with examples.
What Is a TVS Diode?
A TVS diode is a fast clamping diode that protects a circuit against sudden overvoltage surges. Learn how it works, how it differs from a zener and where it's used.
What Is a Varactor (Varicap) Diode?
A varactor (varicap) diode is a special diode whose capacitance changes with reverse voltage. Learn the voltage-controlled capacitance concept and its RF tuning use.
What Is a Photodiode?
A photodiode is a diode that converts the light falling on it into electric current. Learn how it works, how it differs from an LED, its operating modes and sensor use.
What Is a PIN Diode?
A PIN diode adds an undoped intrinsic layer between the P and N layers and behaves like a variable resistor at high frequency. Learn its RF use.
What Is a Tunnel Diode?
A tunnel diode works by quantum tunneling and has a negative-resistance region, making it a very fast diode. Learn how it works and its high-frequency use.
What Is a Fast Recovery Diode?
A fast recovery diode is a power diode with a very short reverse recovery time (trr). Learn why it's needed in high-frequency switching.
Displays
What Is an LCD Display?
An LCD display forms an image by controlling light with liquid crystals. Learn the backlight need and how it works.
What Is an OLED Display?
An OLED display is a technology where each pixel produces its own light. Learn deep black, the thin structure and how it differs from LCD.
What Is a TFT Display?
A TFT display is an advanced color LCD that drives each pixel with a thin-film transistor. Learn its advantages and uses.
What Is a 7-Segment Display?
A 7-segment display shows digits with seven LED bars. Learn common anode/cathode and the driving method.
What Is a Graphic / Dot Matrix Display?
A graphic (dot matrix) display can draw any shape and text with individual pixels. Learn how it differs from a character LCD.
What Is an E-Ink (E-Paper) Display?
An E-Ink display preserves the image without consuming power and reads like paper. Learn its advantages and limits.
Fundamentals
What Is Ohm's Law?
Ohm's law is the fundamental relationship between voltage, current and resistance in a conductor: V = I × R. This article covers the formula, the triangle mnemonic and worked examples in the simplest way.
What Are Current, Voltage and Resistance?
The three fundamental quantities of electronics: current, voltage and resistance. Learn the relationship between them, their units and how they're measured with the water-pipe analogy.
What Is the Difference Between AC and DC?
What is the difference between AC (alternating current) and DC (direct current)? Learn the waveforms, uses, and why the mains outlet delivers AC while electronic circuits run on DC.
What Are Series and Parallel Connections?
The two basic ways to connect components: series and parallel. Learn how resistance, voltage and current behave in each with formulas and examples.
What Is a Multimeter, and How Do You Use It?
A multimeter measures voltage, current, resistance and continuity — the basic tool for anyone working with electronics. Learn correct use, probe connections and common mistakes.
What Is PWM (Pulse Width Modulation)?
PWM is a technique for adjusting average power by switching a signal on and off very quickly. Learn the duty cycle, average voltage and LED/motor applications.
How Do You Read a Datasheet?
A datasheet is the official technical document prepared by a component's manufacturer. Learn to correctly read the absolute maximum ratings, electrical characteristics and pinout.
What Is Soldering, and How Do You Do It?
Soldering is the process of joining components electrically and mechanically. Learn the tools you need, the correct soldering steps and the difference between a good and a bad joint.
What Is Electric Current? (Amperes)
Current is the amount of electric charge passing through a conductor per unit time; its unit is the ampere. Learn how current forms, its direction, unit multiples and how it's measured.
What Is Voltage?
Voltage is the electrical potential difference between two points; the push that moves electrons. Learn the volt unit, sources and measurement with examples.
What Are Electric Charge and Electrons?
Electric charge is a fundamental property of matter; electrons are the carriers of current. Learn the concept of charge, the coulomb unit and the difference between conductors, insulators and semiconductors.
What Is Electrical Power? (Watts)
Electrical power is the energy dissipated per unit time: P = V × I. Learn the watt unit, the derived power formulas and choosing a resistor's power rating with worked examples.
What Are Energy and Consumption? (Wh / kWh)
Energy is power accumulated over time; its unit is the watt-hour (Wh). Learn the difference between power and energy, battery capacity (mAh) and consumption calculation with worked examples.
What Are Kirchhoff's Laws? (Current and Voltage Law)
Kirchhoff's laws are the foundation of circuit analysis: the current law (KCL) balances currents into and out of a node, the voltage law (KVL) balances voltages around a loop. Learn them with a worked example.
What Is the Power Formula (P = V × I), and How Do You Calculate It?
Electrical power is calculated with three formulas: P=V×I, P=I²×R and P=V²/R. Learn which formula to use when and how to calculate power step by step with worked examples.
What Are Joule's Law and Heating?
Joule's law describes the heat produced by current flowing through a conductor: Q = I²×R×t. Learn why components heat up, thermal management and the need for a heat sink.
What Are Frequency and Period? (Hz)
Frequency is how many times a signal repeats per second (Hz); the period is the duration of one full cycle. Learn the f = 1/T relationship between them, with examples.
What Are RMS, Peak and Average Values?
Ways to express an AC signal as a single number: the peak value, the RMS (effective value) and the average value. Learn the relationship between them and why RMS matters.
What Is the Difference Between Analog and Digital Signals?
An analog signal can take continuous, infinite values, while a digital signal takes only discrete levels (0 and 1). Learn the difference, conversion (ADC/DAC) and examples.
What Are Logic Levels? (HIGH/LOW, TTL and CMOS)
Logic levels are the voltage ranges that represent 0 and 1 in digital circuits. Learn the HIGH/LOW thresholds, the TTL vs CMOS difference and the 3.3V-5V compatibility issue.
What Is a Voltage Divider?
A voltage divider is a basic circuit that lowers a voltage proportionally with two resistors. Learn the Vout = Vin × R2/(R1+R2) formula, a worked example and the loading effect.
What Are Short Circuits and Open Circuits?
A short circuit is when current bypasses the intended path and flows through a very low resistance; an open circuit is a broken path. Learn their risks, protection and detection.
What Is an Electrical Load?
A load is any component in a circuit that dissipates energy (draws current from the source). Learn load current, the source-load relationship and types of loads with examples.
What Are Ground (GND), Chassis and Reference?
Ground (GND) is the common reference point (0 V) against which all voltages in a circuit are measured. Learn the GND types, why a common ground is essential and ground loops.
What Is Impedance?
Impedance is the total opposition to current in AC circuits; it combines resistance with reactance. Learn reactance and how it changes with frequency.
What Is an Oscilloscope, and What Is It For?
An oscilloscope is a measuring instrument that displays an electrical signal against time on a screen. It lets you see the waveform, frequency and noise. Learn how it works and how to use it.
How Do You Measure Voltage, Current and Resistance?
With a multimeter, voltage is measured in parallel, current in series and resistance in a de-energized circuit. Learn the correct range, probe connection and what to watch for, step by step.
What Is a Breadboard?
A breadboard is a perforated prototyping platform that lets you build circuits without soldering. Learn the hole-connection logic, the power rails and the usage limits.
What Is a PCB (Printed Circuit Board)?
A PCB (printed circuit board) is an insulating board that carries components and connects them with copper traces. Learn the layers, THT/SMD mounting and the manufacturing process.
How Do You Read a Schematic (Circuit Diagram)?
A schematic is a map of a circuit drawn with symbols. Learn to read the symbols, connections and nodes, and the reference designators (R1, C1, U1) with examples.
What Are Component Package Types? (SMD vs DIP)
A component package is a part's physical case and mounting style. Learn the THT (DIP) vs SMD difference, common packages (0805, SOT-23, QFP) and selection criteria.
How Do You Read Resistor Color Codes?
Resistor color codes show a resistor's value and tolerance through the colors of its bands. Learn the color-digit table, reading 4/5 bands and a worked example.
What Are SI Prefixes? (kilo, milli, micro, nano, pico)
SI prefixes let us write very large and very small values simply: kilo, milli, micro, nano, pico. Learn their use in electronics (kΩ, µF, mA) and their conversions.
What Are Electronic Circuit Symbols?
Circuit symbols are the standard drawings that represent components in schematics. Learn common symbols for the resistor, capacitor, diode, transistor and ground.
What Is Polarity?
Polarity means a component has a positive/negative direction. Learn polarized components like the diode, LED and electrolytic capacitor and correct mounting.
What Is ESD (Electrostatic Discharge), and How Do You Protect Against It?
ESD is the sudden discharge of built-up static electricity, and it can damage sensitive chips invisibly. Learn the ESD risk and protection methods (wrist strap, antistatic mat).
What Are the Basics of Electrical Safety?
Safety is essential when working with electricity: recognizing voltage risk, using fuses and insulation, avoiding short circuits. Learn the basic safety rules.
What Are Logic Gates? (AND, OR, NOT, NAND)
Logic gates are the building blocks of digital circuits that process 0 and 1 inputs by set rules to produce a 0/1 output. Learn the AND, OR, NOT, NAND gates and their truth tables.
What Is the Binary Number System?
The binary number system uses only 0 and 1 and is the fundamental language of computers. Learn the bit/byte concept, binary-decimal conversion and hexadecimal notation with examples.
What Are ADC and DAC? (Analog-Digital Conversion)
An ADC converts an analog signal to digital, a DAC converts digital to analog. Learn this bridge between two worlds, and the concepts of resolution (bits) and sampling, with examples.
What Are Truth Tables and Boolean Logic?
Boolean logic works with only true (1) and false (0); a truth table shows a logic circuit's full input-output behavior. Learn AND/OR/NOT and building a truth table with examples.
What Are UART, SPI and I2C? (Serial Communication Protocols)
UART, SPI and I2C are the most common serial protocols chips use to exchange data. Learn how each works, its line count and the differences between them.
What Is the Difference Between Serial and Parallel Communication?
Serial communication sends data one bit at a time over a single line; parallel sends many bits at once over many lines. Learn the difference, the trade-offs and why serial won out.
What Is a Filter? (Low-Pass / High-Pass)
A filter is a circuit that passes certain frequencies in a signal and attenuates the rest. Learn the low/high/band-pass types, the cutoff frequency and the RC filter.
What Is the RC Time Constant? (Charge/Discharge)
The RC time constant (τ = R×C) sets how fast a capacitor charges/discharges. Learn the charge curve, the 63% rule and a worked example.
What Are Resonance and the LC Circuit?
Resonance is the special condition in an LC circuit where the coil's and capacitor's effects balance at a certain frequency. Learn the resonant frequency and its applications.
What Are Capacitance and Inductance?
Capacitance is a component's ability to store electric charge (farads); inductance is its ability to store energy in a magnetic field (henries). Learn both and their AC behavior.
What Are Gain and Amplification?
Gain is the ratio of how much an amplifier enlarges its input signal. Learn how to calculate gain, the decibel (dB) concept and where amplification is used.
What Is Feedback?
Feedback is feeding part of a circuit's output back into its input. Negative feedback provides stability, positive feedback produces oscillation. Learn both.
What Are Noise and SNR?
Noise is an unwanted signal mixed into the useful one; SNR is the ratio of signal to noise. Learn the noise sources, SNR and noise-reduction methods.
What Are Pull-up and Pull-down Resistors?
Pull-up and pull-down resistors give a digital input a default logic level (HIGH/LOW), preventing the floating problem. Learn both and how to choose the value.
What Is Efficiency?
Efficiency is the ratio of a circuit's output power to its input power (η = Pout/Pin). Learn where the losses go, how to calculate it and regulator efficiency with examples.
What Are Thermal Resistance and Heat Management?
Thermal resistance (°C/W) shows how hard it is for heat to flow from a component to its surroundings. Learn junction temperature, heat sink selection and heat management.
What Is Electromagnetic Induction?
Electromagnetic induction is a changing magnetic field producing a voltage in a conductor (Faraday's law). Learn how it works and its transformer/motor/generator applications.
Integrated Circuits
What Is the Difference Between Analog and Digital ICs?
An analog IC processes continuous signals, a digital IC processes 0/1 values. Learn the difference between the two, examples and mixed structures.
What Is a Microchip?
A microchip (integrated circuit) combines millions of components on a single piece of silicon. Learn its types, the microprocessor vs. microcontroller difference and its uses.
What Are SMD vs DIP Package Types?
SMD is surface-mount, DIP is the classic through-hole IC package. Learn their differences, types and how to choose.
What Is an ASIC?
An ASIC is an integrated circuit custom-designed for a specific application. Learn its advantages, cost and how it differs from an FPGA.
What Is an FPGA?
An FPGA is a hardware-logic chip that can be reprogrammed in the field. Learn how it works, its advantages and how it differs from an ASIC.
What Is a CPLD?
A CPLD is a programmable logic chip smaller than an FPGA with persistent configuration. Learn how it differs from an FPGA and its uses.
What Is a SoC (System on Chip)?
A SoC combines an entire computer system on a single chip. Learn what's inside it, its advantages and its uses.
Interface & Communication
What Is UART?
UART is a common interface providing clockless (asynchronous) serial communication between two devices. Learn how it works and its uses.
What Is I2C?
I2C is a synchronous serial bus that connects many devices with two lines by addressing them. Learn how it works and its uses.
What Is SPI?
SPI is a four-line interface providing high-speed synchronous serial communication. Learn how it works and its uses.
What Is CAN Bus?
CAN Bus is a robust serial bus used especially in automotive. Learn how it works and its advantages.
What Are RS-485 / RS-232?
RS-232 and RS-485 are communication standards that carry serial data over long distances. Learn their differences and uses.
What Is the USB Interface?
USB is a universal interface used to connect devices and transfer both data and power. Learn how it works and its uses.
What Is an Ethernet PHY?
An Ethernet PHY is a chip that converts digital network data into a physical signal on the cable. Learn how it works and its uses.
What Is a Level Shifter?
A level shifter is a circuit that safely connects devices operating at different voltage levels. Learn how it works and its uses.
Logic Circuits
What Are AND / OR / NOT Gates?
AND, OR and NOT are the three basic logic gates of digital circuits. Learn their truth tables, symbols and 74-series ICs.
What Are NAND / NOR / XOR Gates?
NAND, NOR and XOR are logic gates derived from the basic gates. Learn the universal-gate concept and their ICs.
What Is a Flip-Flop?
A flip-flop is the basic digital memory element that stores a single bit. Learn how it works, its types and uses.
What Is a Counter?
A counter is a sequential digital circuit that counts clock pulses. Learn how it works, its types and uses.
What Is a Shift Register?
A shift register shifts its bits sideways on every clock. Learn its role in serial-parallel conversion and pin expansion.
What Is a Multiplexer?
A multiplexer (mux) selects one of many inputs and passes it to a single output. Learn how it works and its uses.
What Is a Decoder?
A decoder converts a binary input code into a single active output. Learn how it works and its uses.
Memory
What Is RAM?
RAM is fast but volatile memory that holds data temporarily during operation. Learn how it works and how it differs from ROM.
What Is SRAM?
SRAM is a very fast RAM type that needs no refreshing. Learn how it differs from DRAM and where it's used.
What Is DRAM?
DRAM is a dense RAM type that holds data in a capacitor and must be refreshed constantly. Learn how it works and its uses.
What Is ROM?
ROM is read-only memory whose contents are persistent and not erased when power is cut. Learn its types and uses.
What Is EEPROM?
EEPROM is a persistent memory that can be electrically erased and rewritten. Learn its byte-by-byte writing and uses.
What Is Flash Memory (NAND / NOR)?
Flash memory is a fast and dense persistent memory. Learn the NAND vs NOR difference and where it's used.
What Is FRAM?
FRAM is a special memory that writes at RAM speed but keeps data persistently. Learn its advantages and uses.
Microcontrollers & Processors
What Is a Microcontroller (MCU)?
A microcontroller (MCU) is a small computer combining a processor, memory and peripherals on one chip. Learn how it works and where it's used.
What Is a Microprocessor (MPU)?
A microprocessor (MPU) is a powerful processor that computes but uses external memory and peripherals. Learn how it differs from an MCU.
What Is a DSP (Digital Signal Processor)?
A DSP is a special processor optimized to process audio and signal data in real time. Learn how it works and where it's used.
What Is the Difference Between 8-bit / 16-bit / 32-bit Microcontrollers?
The bit width in a microcontroller states the data width the processor handles at once. Learn the 8/16/32-bit difference.
What Is ARM Cortex?
ARM Cortex is a common processor core family licensed by many manufacturers. Learn the Cortex-M, A, R difference and its importance.
What Is the Difference Between a Microcontroller and a Microprocessor?
A microcontroller gathers everything on one chip; a microprocessor needs external memory. Learn the key differences between them.
Optoelectronics & LEDs
What Is a High-Power LED?
A high-power LED runs at high current for lighting and gives a lot of light. Learn the thermal-management and driver needs.
What Is an RGB LED?
An RGB LED can produce millions of colors by combining red-green-blue. Learn how it works and the addressable type.
What Is an Infrared (IR) LED?
An infrared LED emits invisible infrared light. Learn its role in remote control and sensing applications.
What Is an Optocoupler (Opto-Isolator)?
An optocoupler galvanically separates two circuits by transferring a signal with light. Learn how it works and its isolation role.
What Is a Phototransistor?
A phototransistor is a transistor that senses light and amplifies it into an electrical signal. Learn how it differs from a photodiode and its uses.
What Is a Laser Diode?
A laser diode produces focused, single-wavelength coherent light. Learn how it differs from an LED and its uses.
Power Management & Regulators
What Is a Voltage Regulator?
A voltage regulator produces a constant output voltage even as the input varies. Learn the linear and switching types and where they're used.
What Is an LDO (Linear Regulator)?
An LDO is a linear voltage regulator that works with a small input-output difference. Learn how it works, the dropout voltage and its advantages.
What Is a DC-DC Converter?
A DC-DC converter changes one DC voltage into another with high efficiency using switching. Learn its types and its advantage.
What Is a Buck (Step-Down) Converter?
A buck converter steps the input voltage down to a lower voltage with high efficiency using switching. Learn how it works.
What Is a Boost (Step-Up) Converter?
A boost converter raises a low input voltage to a higher voltage using switching. Learn its working principle and uses.
What Is a PMIC (Power Management IC)?
A PMIC manages several power rails on a single chip. Learn its functions, why it's used and its advantages.
What Is a Battery Charger IC?
A battery charger IC charges Li-Ion/LiPo batteries safely with the correct profile. Learn the charge stages and safety functions.
What Is a MOSFET Gate Driver?
A gate driver is an intermediate chip that switches a power MOSFET/IGBT's gate quickly. Learn why it's needed and its role in switching speed.
What Is an LED Driver?
An LED driver feeds LEDs with constant current to preserve brightness and life. Learn why constant current is needed.
What Is a Voltage Reference?
A voltage reference is a chip that produces a very stable voltage independent of temperature and load. Learn how it differs from a regulator and its role in an ADC.
Power Supplies & Batteries
What Is a Power Supply?
A power supply converts energy from a source into the stable voltage a circuit needs. Learn its types.
What Is an AC-DC Adapter?
An AC-DC adapter converts mains alternating current into the direct current a device uses. Learn how it works.
What Is a DC-DC Power Module?
A DC-DC power module is a ready-to-use power component with the converter circuit on a board. Learn its use.
What Is a Battery?
A battery is a portable power source that converts chemical energy into electrical energy. Learn the primary/secondary types and its parameters.
What Is a Li-Ion / LiPo Battery?
Li-Ion and LiPo are high-energy-density rechargeable lithium batteries used safely with a BMS. Learn their differences.
What Is a Coin Cell Battery?
A coin cell is a small coin-shaped battery used in clock and RTC backup. Learn its types.
What Is a Battery Holder?
A battery holder mechanically secures batteries and connects them to the circuit. Learn its types and selection.
Resistors
What Is a Resistor?
A resistor is the most basic passive component, used to limit current and divide voltage. Learn its relationship with Ohm's law, its types and selection criteria with examples.
What Is an SMD / Chip Resistor?
An SMD (chip) resistor is a small rectangular surface-mount resistor. Learn the size codes (0805 etc.), how to read the value and its advantages.
What Is a Carbon Film Resistor?
A carbon film resistor is a cheap, general-purpose resistor made by coating a ceramic body with carbon film. Learn its properties and how it differs from metal film.
What Is a Metal Film Resistor?
A metal film resistor is a precision resistor offering tight tolerance, low noise and high stability. Learn how it differs from carbon film and where it's used.
What Is a Wirewound Resistor?
A wirewound resistor is made by winding resistance wire around a core and can carry high power. Learn its advantages and limits.
What Is a Power Resistor?
A power resistor can dissipate a large amount of power as heat. Learn the importance of the power rating, its types and the need for cooling.
What Is a Shunt / Current Sense Resistor?
A shunt (current sense) resistor is a very low-value resistor used to measure the current flowing through it. Learn how it works and where it's used.
What Is a Resistor Array / Network?
A resistor array/network holds several resistors in a single package. Learn its types, advantages and uses such as pull-up arrays.
What Is a Potentiometer?
A potentiometer is a three-terminal resistor that can be adjusted by hand. Learn how it works, its use as a voltage divider and its linear/logarithmic types.
What Is a Trimpot (Trimmer)?
A trimpot (trimmer potentiometer) is a small board-mounted potentiometer used for fine adjustment. Learn its use and how it differs from a regular pot.
What Is a Rheostat?
A rheostat is a two-terminal adjustable resistor used to control current. Learn how it differs from a potentiometer and where it's used with examples.
What Is a Photoresistor (LDR)?
A photoresistor (LDR) is a component whose resistance changes with the light falling on it. Learn how it works, measuring light with a voltage divider and its uses.
What Is a Thermistor (NTC / PTC)?
A thermistor is a component whose resistance changes with temperature. Learn the NTC vs PTC difference and uses like temperature sensing and inrush protection.
What Is a Varistor (MOV)?
A varistor (MOV) has voltage-dependent resistance and protects against sudden overvoltage surges. Learn how it works and where it's used.
How to Choose a Resistor's Power Rating (Watts)?
A resistor's wattage is chosen so it can carry the power it dissipates as heat. Learn the power calculation, derating and worked examples.
Sensors
What Is a Sensor?
A sensor is a component that converts a physical quantity (temperature, light, motion, etc.) into a measurable electrical signal. Learn how it works, its types and selection.
What Is a Temperature Sensor?
A temperature sensor converts ambient or surface temperature into an electrical signal. Learn its types (thermistor, thermocouple, RTD, IC) and selection.
What Is a Thermocouple?
A thermocouple is a temperature sensor that produces a voltage from the temperature difference at the junction of two dissimilar metals. Learn the Seebeck effect, its types and use.
What Is a Pressure Sensor?
A pressure sensor converts gas or liquid pressure into an electrical signal. Learn how it works, the absolute/gauge/differential types and its uses.
What Is a Humidity Sensor?
A humidity sensor measures the relative humidity in the air. Learn the capacitive/resistive principle, its types and modules like the DHT11/DHT22.
What Is an Accelerometer?
An accelerometer is a MEMS sensor that measures acceleration and tilt. Learn how it works, the axis count and phone/gaming/vibration applications.
What Is a Gyroscope?
A gyroscope is a MEMS sensor that measures an object's angular rate (rotation rate). Learn how it differs from an accelerometer, the drift problem and its uses.
What Is an IMU?
An IMU combines an accelerometer and gyroscope (sometimes a magnetometer) in one package. Learn the 6/9-axis difference and sensor fusion.
What Is a Proximity Sensor?
A proximity sensor detects an object approaching without contact. Learn the inductive/capacitive/optical types and its uses.
What Is a Distance Sensor (ToF / Ultrasonic)?
A distance sensor measures the distance to an object. Learn the ultrasonic (sound) and ToF (light) methods, their differences and uses.
What Is a Hall Effect Sensor?
A Hall effect sensor detects a magnetic field. Learn how it works, the digital/analog output types and its use in current/speed/position measurement.
What Is a Current Sensor?
A current sensor measures the current flowing through a circuit. Learn the shunt-resistor and Hall-effect methods, the isolation difference and its uses.
What Is a Light / Color Sensor?
A light sensor measures ambient light intensity, and a color sensor measures color. Learn how they work, how they differ from an LDR and auto-brightness/color-sorting use.
What Is a Gas Sensor?
A gas sensor detects the concentration of a specific gas in the air. Learn how it works, the MQ-series types and safety use.
What Is a MEMS Microphone?
A MEMS microphone is a tiny micro-electromechanical sensor that converts sound into an electrical signal. Learn how it works, the analog/digital (PDM) difference and its uses.
What Is a Capacitive Touch Sensor?
A capacitive touch sensor detects the capacitance change created by a finger's touch. Learn how it works, its types and phone-screen/button use.
What Is an Image Sensor?
An image sensor converts light into a digital image. Learn the pixel structure, the CMOS vs CCD difference and camera use.
Switches & Relays
What Is a Switch?
A switch is an electromechanical component that opens and closes a circuit by hand. Learn the pole/throw (SPST, SPDT) concepts and its types.
What Is a Push Button?
A push button is a momentary switch that conducts while held. Learn the NO/NC contact structure and its uses.
What Is a Tactile Switch?
A tactile switch is a small board-mounted momentary button that gives a light click feel when pressed. Learn its structure and uses.
What Is a Toggle Switch?
A toggle switch is a latching switch that changes position by flipping a lever. Learn its types and uses.
Thyristors & Power Switching
What Is a Thyristor (SCR)?
A thyristor (SCR) is a power switch that turns on with a gate pulse and stays on until the current is cut. Learn how it works and its uses.
What Is a TRIAC?
A TRIAC is a thyristor that can conduct in both directions. Learn its role in AC power control and dimmers.
What Is a DIAC?
A DIAC is a bidirectional trigger element that suddenly conducts when a certain voltage is reached. Learn its role in TRIAC triggering.
What Is a GTO?
A GTO is a thyristor that can be both turned on and off from its gate. Learn how it differs from a classic SCR and its high-power use.
What Is a UJT (Unijunction Transistor)?
A UJT is a single-junction switching element used in triggering and oscillator circuits. Learn how it works and its uses.
Transformers
What Is a Transformer?
A transformer is a passive component that steps AC voltage up/down through a magnetic coupling and isolates circuits. Learn how it works and the turns ratio.
What Is a Power Transformer?
A power transformer converts and isolates AC voltage at high power. Learn its VA rating and efficiency.
What Is a Pulse Transformer?
A pulse transformer transfers short-duration pulse signals with isolation. Learn its role in gate driving and data isolation.
What Is a Current Transformer?
A current transformer converts a high AC current into a small, safely measurable current. Learn how it works and its uses.
What Is an Isolation Transformer?
An isolation transformer galvanically separates two circuits without changing the voltage. Learn its safety role.
Transistors
What Is a Transistor?
A transistor is a three-terminal semiconductor for amplifying or switching signals. Learn the BJT vs. MOSFET difference, its terminals and why it's the foundation of the digital age.
What Is a BJT (Bipolar Junction Transistor)?
A BJT is a three-terminal transistor controlled by base current. Learn the NPN/PNP difference, current gain (β) and amplifier/switch operation with examples.
What Is a MOSFET?
A MOSFET is a high-efficiency transistor controlled by gate voltage. Learn how it works, the N/P-channel difference, how it differs from a BJT and its role in power switching.
What Is a JFET?
A JFET is a simple field-effect transistor controlled by gate voltage with a very high input impedance. Learn how it differs from a MOSFET and where it's used.
What Is an IGBT?
An IGBT is a power transistor that combines the easy drive of a MOSFET with the high power-handling of a BJT. Learn how it works and its inverter/motor-drive use.
What Is a Darlington Transistor?
A Darlington transistor cascades two BJTs to achieve very high current gain. Learn its advantages, limits and use in relay/motor driving.
What Is a Power Transistor?
A power transistor is designed to switch or amplify high current and power. Learn about cooling, package types and power loss.
What Is an RF Transistor?
An RF transistor is optimized for high-frequency (radio) signals. Learn why it's special and its use in transmitters/receivers.
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