Passive & Active Filters
RC/RL cutoffs, Sallen-Key, and biquad design.
Learn Electronics
Three guided paths and a library of 48 topic modules — filter by level and build real understanding alongside the calculators.
Beginner
First Circuits
Ohm's law, resistors, LEDs, breadboards and your first multimeter skills — an interactive, hands-on tutorial.
Start learning IntermediateAC, Filters & Op-Amps
Reactance, resonance, filter design and practical op-amp topologies — with live calculators and animated circuit visuals.
Start learning AdvancedPower & RF Design
Switching supplies, motor drives, impedance matching and antenna design — with live calculators and animated switching/RF visuals.
Start learningTopic Library
48 Suggested Topics
Tap a level to filter. Every module ships with worked examples tied to live calculators.
Intermediate
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DC Circuit Analysis
KVL & KCL, series-parallel reduction, Thevenin, Norton and superposition — 8 interactive lessons with quizzes.
Start ⚡Ohm's Law in Practice
V=IR, power, dissipation, and real-world problem sets — 5 interactive lessons.
🧭Voltage, Current & Resistance
The core quantities, their units, and how they interact — 4 interactive lessons.
BeginnerMultimeter & Measurement
VOM/DMM use, probing, ranges and bench safety — the hands-on skill behind every measurement.
Start BeginnerBreadboarding & Soldering
Clean breadboard layouts, soldering tools & safety, and through-hole plus SMD techniques — 10 hands-on lessons.
Start learning BeginnerLEDs & Light
Forward voltage, current limiting, and series/parallel LED arrays — 7 lessons with live interactive circuits.
Start learning Beginner → AdvancedBatteries & Energy Storage
Ah, Wh, series/parallel packs, C-rating, SOC/DoD, CC/CV charging, BMS, safety and real energy-storage design — 55 lessons with live calculators.
Start learning Beginner → AdvancedAC Fundamentals & Phasors
Sine waves, amplitude, frequency, phase and lead/lag, RMS values, complex numbers, rectangular & polar form, Euler's identity, and complete phasor and AC power analysis — 40 lessons with a live phasor playground and calculators.
Start learning 🌀Impedance & Reactance
X_L, X_C, complex impedance, series/parallel networks, phasors and resonance — 20 interactive lessons.
Beginner → AdvancedRLC Resonance
Resonant frequency, Q factor and bandwidth — the resonance condition, impedance around f₀, series vs parallel resonance, filtering and real‑world losses, plus a full design and troubleshooting walkthrough. 12 lessons with a live resonance lab and frequency‑response explorer.
Start learningOscilloscopes & Waveforms
Triggering, probes, and reading real signals.
Oscillators & Timing
555 timers, astable/monostable, and crystal references.
Signal Processing Basics
Sampling, aliasing, and fundamental DSP concepts.
Diodes & Rectifiers
Forward curves, bridge circuits, and protection.
BJT Transistors
Biasing, amplification, switching, and saturation.
MOSFETs & Power Devices
Gate drive, Rds(on), and switching losses.
Op-Amps & Analog Design
Gain configs, integrators, comparators, stability.
Amplifier Design
Class A/B/AB, gain staging, and headroom.
Zener & Regulation
Zener diodes, LDOs, and dropout voltage.
Logic Gates & Digital Circuits
Gates, Boolean algebra, and truth tables.
Combinational & Sequential Logic
Muxes, flip-flops, counters, and latches.
Microcontrollers (Arduino/ESP32)
GPIO, timers, interrupts, and first projects.
Sensors & Actuators
Reading the physical world and moving it.
Communication Protocols
UART, I²C, SPI — and how to debug them.
Robotics & Motor Control
PWM, H-bridges, encoders, and PID loops.
IoT & Embedded Systems
From sensor to cloud, with power-aware design.
Power Supplies & Rectifiers
Half/full wave, ripple, and smoothing capacitors.
Switching Converters
Buck, boost, buck-boost, and efficiency.
Three-Phase Power
Star/delta, line vs phase, and power factor.
Transformers & Magnetics
Turns ratio, VA rating, and impedance.
Motors & Generators
DC motors, induction slip, and output power.
Solar & Renewable Energy
Panel sizing, MPPT, and battery bank design.
Battery Management Systems
BMS architecture, balancing, and safe charging.
RF Fundamentals
Frequency, wavelength, dB, and 50 Ω systems.
Antenna Design
Dipoles, Yagi arrays, gain, and matching.
Transmission Lines & Matching
VSWR, stubs, and line impedance.
Receivers & Modulation
AM/FM, SSB, and receiver sensitivity.
EMC, EMI & Shielding
Noise sources, grounding, and compliance basics.
PCB Design & Layout
Schematics, traces, vias, and EMC-aware routing.
Thermal Management
Heat sinks, derating, and thermal resistance.
Wire, Cable & AWG
AWG sizes, current capacity, and voltage drop.
Grounding & Bonding
Earth, chassis, and signal ground strategies.
High Voltage Basics
Safety, creepage distance, and HV measurement.
Audio Engineering
SPL, impedance, crossovers, and level matching.
Lighting & LED Drivers
Constant current, dimming, and efficacy.
Medical & Industrial Electronics
Isolation, standards, and reliability design.
Aerospace & Automotive Electronics
Qualification, CAN bus, and harsh-environment design.