Calculate TL431 output voltage, resistor values, divider current, and resistor power for voltage reference and feedback circuits. Quickly select suitable standard resistor values for your desired output voltage.
Calculate the output voltage of a resistor voltage divider using the input voltage and resistor values. Quickly determine the voltage across the lower resistor for circuit design and analysis.
Calculate voltage, current, resistance, and power using Ohm’s Law. Enter any two known values to determine the remaining electrical parameters quickly and accurately.
Calculate the correct series resistor for an LED using the supply voltage, LED forward voltage, and desired LED current. Includes resistor value and power rating.
Calculate 555 timer frequency, period, ON time, OFF time, duty cycle, and pulse width in astable and monostable modes.
Calculate resistor values from 4-band and 5-band colour codes, or find the colour bands for a known resistance value.
