Electronics Guides & Tutorials
Step-by-step guides for circuit design, component selection, and troubleshooting.
Featured Guides
Electronics Calculators (Free): Ohm's Law, Resistors, Voltage Dividers & More
Free electronics calculators for Ohm's law, voltage dividers, LED resistors, 555 timers, and more. 19 tools for circuit design.
Power Electronics Calculators (Free): LEDs, Batteries, Converters & Voltage Regulation
Power electronics calculators for LED arrays, battery charge time, buck/boost converters, voltage regulation, PWM duty cycle, and capacitor energy.
How-To Guides
How to Size an LED Resistor or Driver for Target Current and Brightness
Learn to size an LED resistor or constant-current driver. Calculate resistor value, power rating, and series/parallel LED array configuration.
How to Estimate Battery Runtime and Choose the Right Capacity
Calculate battery runtime from capacity and load current. Learn to size a battery pack, apply derating factors, and plan charge time using the C-rate.
How to Pick a Buck Converter vs a Linear Regulator
Choose between a buck converter and a linear regulator for your power supply. Compare efficiency, cost, noise, and thermal limits with worked examples.
How to Choose a Resistor Value for LEDs, Voltage Dividers & Pull-Ups
Step-by-step guide to choose resistor value for LEDs, voltage dividers, and pull-ups. Formulas, examples, and free calculator.
How to Use a Multimeter to Measure Voltage, Current & Resistance
Step-by-step guide to use a multimeter for measuring voltage, current, and resistance. Safety tips and troubleshooting techniques.
How to Design a Voltage Divider for ADC Input
Scale sensor voltages to match your microcontroller ADC. Step-by-step resistor calculation with loading effects and safety margins.
How to Calculate RC Time Constant for Filters & Timing Circuits
Calculate τ = R×C for filter design, switch debouncing, and timing circuits. Includes the 1τ/3τ/5τ rule and worked examples.
How to Use a 555 Timer in Astable & Monostable Modes
Configure the 555 timer IC as a free-running oscillator or single-pulse generator. Includes formulas, component selection, and worked examples.