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Electronics

Calculators for resistors, voltage dividers, LEDs and PCB traces.

Calculators and tools

ToolNEW555 Timer CalculatorFrequency, duty cycle and timing of a 555 astable oscillator, the pulse length of a monostable, and R2 for a wanted frequency.Open →ToolNEWBattery Runtime and Pack CalculatorHow long a battery lasts for a given load (with sleep and active currents and converter efficiency), and the voltage, capacity and energy of a series and parallel cell pack.Open →ToolNEWLM317 Adjustable Regulator CalculatorOutput voltage of an LM317 from its two resistors, R2 for a wanted output, and the power and temperature rise in the regulator.Open →ToolNEWOhm’s Law and Power CalculatorGive any two of voltage, current, resistance and power and get the other two, with a suggested resistor power rating.Open →ToolNEWPCB Trace Width & Current CalculatorPCB trace width calculator (IPC-2221): the width a current needs or the current a trace can carry, with resistance, voltage drop and power loss.Open →ToolNEWRC Time Constant and Filter CalculatorTime constant, cutoff frequency, filter gain at a chosen frequency, charging times, and the capacitor or resistor for a wanted cutoff.Open →ToolNEWReactance and Resonance CalculatorCapacitor and inductor reactance at a frequency, the current for an applied voltage, and the resonant frequency of an LC circuit.Open →ToolNEWResistor Color Code CalculatorRead a four-, five- or six-band resistor, or find the color bands for a value, with the tolerance range and a picture.Open →ToolNEWResistor Network and Standard Value CalculatorSeries and parallel totals, the nearest E12, E24 or E96 standard value, and the best two-resistor combination for a target value.Open →ToolNEWThree-Phase Power and Power Factor CalculatorThree-phase power calculator: kW, kVA, kvar and amps from voltage and power factor, motor input power and power factor correction capacitor size.Open →ToolNEWVoltage Divider and LED Resistor CalculatorVoltage divider output with and without a load, the resistor for a target voltage, and the series resistor for an LED.Open →ToolNEWWire Ampacity and Voltage Drop CalculatorWire ampacity calculator with NEC and IEC tables, ambient and bundling corrections, voltage drop, power loss and the smallest size that works.Open →

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Printed from engineerunderground.com/tools/electronics/ · Engineer Underground
Free to read online. General information, not professional engineering advice: check results against the standards and data that apply to your project.

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