Multifunctional engineering calculations of electronic circuits and components

A helpful tool for reading SMD (surface mount device) resistor markings found on the device. It displays rated resistance and resistor tolerance.

This calculator allows you to determine signal parameters of a square pulse generator built on the basis of the popular 555 microcircuit which works as a multivibrator i.e. in self-oscillating mode.

This calculator is an online tool to quickly determine the capacitor value required for transformerless power supply circuit. A simple transformerless power supply with resistive load can be used if there is a need to connect to the AC mains a load designed for a voltage much less than the mains voltage, for example, a soldering iron. In this circuit a capacitor and resistive load are connected in series to AC mains.

Online Units Converter allows you to convert 10 types of measurement units: Length, Weight, Temperature, Volume, Area, Speed, Time, Pressure and Energy. It is easy to use and is available in English and Spanish.

Voltage Divider Calculator is a simple easy-to-use tool that helps you evaluate the output voltage or resistors values in a single voltage divider according to Ohm's law.

Wire resistance calculator allows you to quickly determine the electrical resistance of a specific wire. The resistance of a wire depends on its material and geometrical dimensions (length and diameter or cross-sectional area).

Zener voltage regulator calculator allows you to quickly determine the series resistor value of a Zener diode. This tool also displays recommended resistor wattage as well as resistor color coding and SMD resistor code.