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Electronics Audio Connector Types Explained: TRS, XLR, RCA, Optical & More What TS, TRS, and TRRS mean, why XLR rejects noise, the difference between balanced and unbalanced, and when to use optical vs coaxial digital audio. 8 min read Electronics Video Connector Types Explained: HDMI, DisplayPort, VGA, DVI & the Rest How to tell video connectors apart, why HDMI 1.4 and 2.1 look identical but differ hugely, when you need an active adapter, and which connectors carry audio. 8 min read Electronics USB Connector Types Explained: A, B, C, Mini, Micro & the Speed Names How to tell USB connector shapes apart, why USB-C is not the same as USB 3, and what "SuperSpeed", "Gen 2x2" and USB4 actually mean in real numbers. 8 min read Electronics NEMA Plug Types Explained: How to Read 5-15, 14-50 & the Twist-Locks What the numbers in a NEMA designation mean, the difference between 3-wire and 4-wire dryer/range plugs, and which outlet you need for EV and RV charging. 8 min read Electronics How Ohm’s Law Works: Voltage, Current & Resistance The V = I × R relationship explained plainly, with a worked example and the triangle trick for rearranging it. 6 min read Electronics How to Read Resistor Color Codes (4, 5 & 6 Band) Which bands are digits, which is the multiplier, and how to read tolerance — with the full color-to-number chart. 7 min read Electronics How to Calculate an LED Series Resistor Why every LED needs a series resistor, the simple formula to size it, how to pick the forward voltage and wattage, and a worked example. 7 min read Electronics How to Read Capacitor Codes The 3-digit number on a ceramic capacitor decodes to a value in picofarads. How the code works, the tolerance letter, voltage ratings, and worked examples. 7 min read Electronics How Voltage Dividers Work Two resistors can turn one voltage into a smaller one. The voltage-divider formula, a worked example, the all-important loading effect, and where dividers are used. 8 min read Electronics AC Waveform Distortion Common AC waveform distortions — harmonics, clipping, crossover — and how to measure them. Electronics AWG Current Capacity (Ampacity) American Wire Gauge current ratings — diameter, resistance, chassis and power transmission ampacity. Electronics Antenna Basics Antenna fundamentals — gain, pattern, polarization, impedance, and common types. Electronics Antenna Radiation Patterns Pattern shapes — isotropic, omnidirectional, directional — with beamwidth and sidelobe notes. Electronics Antenna Types Reference Detailed descriptions of common antennas — dipole, monopole, Yagi, patch, dish, helix, log-periodic. Electronics BJT Basics Bipolar junction transistor fundamentals — NPN / PNP, regions, configurations, and small-signal model. Electronics Battery Basics Battery chemistries compared — voltage, energy density, cycle life, and safety notes. Electronics Battery Charge Algorithms Charge profiles for lead-acid, NiCd/NiMH, and Li-ion chemistries. Electronics Battery Discharge Curves Shape of voltage-vs-capacity curves for major chemistries — how voltage predicts state of charge. Electronics Battery Self-Discharge Self-discharge rates for common battery chemistries. Electronics Biquad Filter Cheat Sheet Biquad coefficients for common filter types — low-pass, high-pass, peaking EQ, shelf. Electronics Boost Converter Reference Boost (step-up) DC-DC converter basics — duty cycle, formulas, and design considerations. Electronics Buck vs Boost Comparison Buck (step-down) and boost (step-up) SMPS topologies compared — and when to use buck-boost. Electronics Capacitor Charge Time RC time constant — charging and discharging formulas with 5τ rule of thumb. Electronics Capacitor Types and Uses Capacitor families — dielectric, typical values, strengths, and common applications. Electronics Capacitors Reference Capacitor fundamentals — formulas, series/parallel behavior, and SMD code decoding. Electronics Charging Voltage Table Per-cell and common-pack charge voltages across chemistries. Electronics Clock Frequency Tolerances Crystal, TCXO, OCXO, and atomic reference — accuracy in ppm. Electronics Coil Inductance Formulas Formulas for calculating inductance of air-core solenoids, multilayer coils, and toroids. Electronics Common Electronics Packages Through-hole and SMD package reference — dimensions and typical use. Electronics Computer Ports & Interfaces Physical connectors on modern computers — speeds, typical cables, and what each is for. Electronics Connector Pinouts Common connector pinouts — USB, Ethernet, audio, serial, power. Electronics Data Transfer Time Reference How long will this file take to transfer? Times for various sizes at typical link speeds. Electronics Decibel Reference Decibel math, power/voltage ratios, reference levels (dBm, dBu, dBV), and everyday SPL examples. Electronics Digital Timing Basics Setup/hold time, clock-to-Q, skew, jitter, and metastability in digital systems. Electronics Distortion Basics Types of audio / signal distortion — harmonic, intermodulation, clipping, crossover — and typical thresholds of audibility. Electronics EMI / EMC Basics Electromagnetic interference sources, coupling paths, and mitigation techniques. Electronics Eddy Current Losses Eddy current behavior — skin depth, proximity effect, and mitigation in magnetics. Electronics Electrical Safety Symbols Standard IEC/ANSI safety and hazard symbols found on electrical equipment. Electronics Embedded Communication Protocols Serial buses and protocols used in embedded systems — I²C, SPI, UART, CAN, RS-485, and more. Electronics FFT Basics Fast Fourier Transform fundamentals — bins, leakage, windows, and common pitfalls. Electronics Filter Q Reference Quality factor (Q) in filters — relationship to damping, bandwidth, and peaking. Electronics Filters Reference Filter responses compared — Butterworth, Chebyshev, Bessel, elliptic — and topology choices. Electronics Flicker Guide Light flicker — percent flicker, flicker index, visible thresholds, and measurement. Electronics Formulas How battery capacity varies with discharge rate — essential for lead-acid sizing. Electronics Fourier Transform Reference Continuous and discrete Fourier transform definitions, properties, and common pairs. Electronics Frequency ↔ Wavelength Relationship between frequency and wavelength — quick-lookup table for RF and sound. Electronics Fuse Types and Ratings Fuse package sizes, speed classes, and how to pick current and voltage ratings. Electronics Harmonics & THD Reference Harmonic distortion in power systems and audio — THD, triplens, and standard limits. Electronics IP Protection Codes IEC 60529 ingress protection ratings — what IP65, IP67, IP68 actually mean. Electronics Inductor Core Materials Ferrite mixes, powdered iron, nanocrystalline — permeability, loss, saturation. Electronics Inductors Basics Inductor fundamentals — formulas, series/parallel combinations, and saturation. Electronics LC Resonance Cheat Sheet LC resonant frequency formulas, series vs parallel resonance, Q factor. Electronics LED Basics LED forward voltages by color, current sizing, and driver topology. Electronics LED Resistor Table Look up the current-limiting resistor for common LED colors and supply voltages. Electronics Load Factor Reference Electrical / utility load factor and demand factor — definitions and why it matters for sizing. Electronics MOSFET vs IGBT Comparison MOSFET and IGBT power transistors compared — voltage, switching speed, losses, and sweet spot. Electronics Motor Driver IC List Popular motor driver ICs for DC, stepper, and BLDC motors — voltage, current, and notable features. Electronics Optical Fiber Types Single-mode and multimode fibers — OM1–OM5, OS1/OS2 — wavelengths and typical distances. Electronics Oscilloscope Basics Bandwidth, sample rate, probing, triggering — core oscilloscope concepts. Electronics PCB Design Rules Common PCB fabrication constraints — trace width, clearance, via sizes, and IPC classes. Electronics PCB Layer Stackups Common 2 / 4 / 6 / 8-layer PCB stackups with signal-integrity guidance. Electronics PCB Materials Reference PCB substrates compared — FR-4, high-Tg, Rogers RF materials, and flex/rigid-flex. Electronics PCB Trace Width Guide PCB trace width for current capacity (IPC-2221) across copper weights and temperature rises. Electronics PID Tuning Guide PID controller basics — what each term does, tuning methods, and common pitfalls. Electronics PWM Basics Pulse-width modulation — frequency, duty cycle, resolution, and typical applications. Electronics PWM Duty Cycle Duty cycle lookup for common PWM resolutions and average voltage vs supply. Electronics Power Converters Reference Overview of DC-DC and AC-DC converter topologies. Electronics Power Factor Reference Real, reactive, and apparent power — the power triangle and typical load PF values. Electronics Power Formulas Reference Power formulas — DC, AC single-phase, three-phase, and mechanical power. Electronics Power Loss Guide Loss mechanisms in power electronics — conduction, switching, core, and how to estimate each. Electronics Power Supply Efficiency Linear vs switching regulator efficiency, load dependence, and losses. Electronics Power Supply Noise Filtering Techniques for cleaning switching-supply ripple — LC, π-filter, ferrite, and LDO post-reg. Electronics Power Supply Standards 80 Plus efficiency tiers, ATX versions, and regulatory standards for PSUs. Electronics Quantization (ADC) Quantization error, SNR, and ENOB in analog-to-digital conversion. Electronics RC Filters First-order RC low-pass and high-pass filter design — cutoff, roll-off, and time constant. Electronics RF Attenuation Table Coaxial cable loss per 100 ft at common frequencies. Electronics RF Connectors Guide Common RF connectors — impedance, frequency limits, gender, and typical use. Electronics RMS vs Peak Peak, peak-to-peak, average, and RMS voltage relationships for common waveforms. Electronics Reactance Cheat Sheet Inductive and capacitive reactance formulas with quick-lookup values at common frequencies. Electronics Relay and Switch Types Contact configurations — SPST, SPDT, DPDT — and common relay/switch families. Electronics Resistor Color Codes Standard 4-band and 5-band resistor color code chart with tolerance and multiplier values. Electronics Resistor Power Guide Size resistors by power dissipation — package ratings, derating, and parallel dissipation. Electronics Resistor Tolerance Table E-series preferred values (E6, E12, E24, E48, E96) and tolerance bands. Electronics Return Loss & VSWR Impedance match quality — VSWR, return loss, and reflection coefficient. Electronics Servo and Stepper Motors Hobby servos, stepper motors, and BLDCs — control signals, typical specs, drivers. Electronics Short Circuit Basics What happens in a short circuit — I²t, interrupting ratings, and protection. Electronics Signal Integrity Basics High-speed digital design — reflections, crosstalk, power integrity, and termination. Electronics Signal-to-Noise Ratio (SNR) Signal-to-noise ratio formula, related measures (SINAD, ENOB), and Shannon capacity. Electronics Solar Sizing Cheat Sheet Size solar PV arrays and batteries — panel output, peak-sun hours, and system losses. Electronics Storage Interface Table Storage interface speeds — SATA, SAS, NVMe, eMMC, microSD. Electronics The core relation Ohm's law and power formulas — V, I, R, P in every combination. Electronics Thermal Cheat Sheet Quick reference for thermal-resistance, dissipation, and heatsink selection. Electronics Thermal Derating Curves How component ratings reduce with ambient temperature — capacitors, resistors, semiconductors. Electronics Thermal Interface Materials (TIM) Thermal pads, pastes, phase-change, and liquid metals — conductivity and typical resistance. Electronics Thermal Resistance Thermal-resistance model for heat flow — R_θJA, R_θJC, R_θCS, and heatsink selection. Electronics Thermistors NTC and PTC thermistors — how they work, Steinhart-Hart, and beta equation for temperature from resistance. Electronics Three-Phase Basics Three-phase power systems — wye vs delta, line vs phase quantities, and common voltages. Electronics Transformer Turns Ratio Common turns ratios for mains-to-low-voltage step-down and impedance matching. Electronics Transformers Reference Transformer fundamentals — turns ratio, impedance reflection, losses, and typical applications. Electronics Transistor Pinouts Pinouts for common through-hole transistor packages — TO-92, TO-220, TO-247, SOT-23. Electronics UPS Basics Uninterruptible power supplies — topologies, sizing, and run-time estimation. Electronics USB Power Delivery Guide USB-PD voltages, profiles, PPS mode, and cable ratings. Electronics USB Versions & Speeds USB generations, advertised speeds, and the confusing USB-IF marketing names. Electronics Voltage Divider Cheat Sheet Resistor divider ratio table for common scaling ratios, plus formulas and loading considerations. Electronics Voltage Drop Reference Wire voltage drop — copper AWG resistance per 1 000 ft, with formula and NEC rules of thumb. Electronics Wire Gauge Table Wire gauge conversion — AWG to mm², metric to imperial, typical uses by gauge.