Electronics Toolkit

ElectroCalc Hub

Practical calculators for electronics students and engineers. Fast, accurate, and built for lab work and circuit design.

Ohm's Law

Find the missing variable using V = I x R.

Voltage Divider

Compute Vout from Vin, R1, and R2.

LED Series Resistor

Find the current-limiting resistor for your LED.

RC Time Constant

Calculate tau = R x C for filters and timing circuits.

Reactance

Find capacitive or inductive reactance at a frequency.

Resistor Color Code

Select 4-band, 5-band, or 6-band and choose band colors directly.

Transistor Base Resistor

Size base resistor for BJT switching using forced beta design.

Linear Regulator Design

Estimate dropout margin, dissipation, efficiency, and thermal requirement.

Zener Regulator

Compute series resistor and zener stress for a basic shunt regulator.

LED String Resistor

Calculate resistor for multiple LEDs connected in one series string.

DC-DC Converter Design Studio

Build quick design estimates for Buck, Boost, and Buck-Boost topologies. Each converter tab includes power component sizing and magnetics selection, with one-click PDF report export.

Buck Converter (Step-Down)

Design for lowering DC voltage with inductor, switch, diode, and output capacitor sizing.

Top MOSFET Parameters (High-Side)

Bottom MOSFET Parameters (Low-Side)

Power Component Selection

Magnetics Selection

MOSFET Performance (Top/Bottom)

Power Loss Graph

Thermal and Heatsink Selection

Boost Converter (Step-Up)

Design for raising DC voltage with duty-cycle and current stress considered at low Vin.

Top MOSFET Parameters (High-Side)

Bottom MOSFET Parameters (Low-Side)

Power Component Selection

Magnetics Selection

MOSFET Performance (Top/Bottom)

Power Loss Graph

Thermal and Heatsink Selection

Buck-Boost Converter

Design for wide-input regulation where output can be above or below input (inverting topology model).

Top MOSFET Parameters (High-Side)

Bottom MOSFET Parameters (Low-Side)

Power Component Selection

Magnetics Selection

MOSFET Performance (Top/Bottom)

Power Loss Graph

Thermal and Heatsink Selection

Study Materials For Students And Engineers

Quick revision modules for analog, power electronics, and practical design work. Use these topics as a roadmap before working on hardware.

Core Electronics

  • Ohm's law, KCL, KVL, power and energy basics
  • Series and parallel resistor network reduction
  • Voltage divider loading effect and source impedance
  • Capacitor and inductor transient intuition
  • Thevenin and Norton equivalent circuits
  • Maximum power transfer principle

Power Design

  • Buck, Boost, and Buck-Boost duty-cycle relations
  • Inductor ripple and output capacitor ripple tradeoffs
  • Switch/diode stress, conduction and switching losses
  • Thermal path: thetaJC, thetaCS, thetaSA fundamentals
  • Current-mode vs voltage-mode control basics
  • Output transient and compensation checkpoints

Components And Layout

  • Resistor code, tolerance, and temperature coefficient
  • LED, transistor biasing, and zener regulator sizing
  • Linear regulator dissipation and heatsink checks
  • PCB loop minimization, grounding, and EMI awareness
  • Decoupling capacitor placement and return path control
  • Input filter and surge protection design notes

Analog Design Practice

  • Small-signal model basics for BJT and MOSFET stages
  • Op-amp gain, bandwidth, stability, and slew limits
  • Filter basics: LPF, HPF, BPF transfer interpretation
  • Noise sources and SNR budgeting fundamentals

Digital And Embedded Basics

  • Logic levels, fan-out, pull-up and pull-down sizing
  • Clocking, timing margins, setup and hold concepts
  • ADC/DAC interface fundamentals and reference routing
  • UART, I2C, SPI practical board-level guidelines

Magnetics And Thermal

  • Inductor core selection using energy and saturation limits
  • Turns/gap tradeoff and copper loss estimation
  • Thermal resistance networks and hotspot analysis
  • Heatsink sizing and airflow decision points

Lab Validation Workflow

  • Bring-up sequence and current-limited first power-on
  • Oscilloscope probing for ripple and switching nodes
  • Efficiency sweep across load and input variation
  • Temperature rise logging with repeatable conditions

Design Review Checklist

  • Validate equation units before finalizing parts
  • Apply 2x power margin for resistors and zeners
  • Cross-check worst-case Vin, load, and temperature
  • Record assumptions in every design report revision
  • Verify ratings against startup and fault conditions
  • Document test evidence for every critical calculation