Components

Resistors, capacitors, inductors, dividers and LED current limiting.

• Current Divider Calculator How a current splits between two parallel resistors, with the voltage across the pair.
• LED Resistor Calculator The series resistor an LED needs — value, nearest standard size, power rating and what the resistor wastes.
• Op-Amp Gain Calculator Voltage gain of an inverting or non-inverting op-amp stage, in volts per volt and decibels, with a clipping check.
• Resistor Colour Code Calculator Reads a 4, 5 or 6-band resistor colour code into a resistance value, with its tolerance band and the range it guarantees.
• Series & Parallel Calculator Combine resistors, capacitors or inductors in series or parallel — enter any number of values and get the equivalent.
• Transistor Bias Calculator Operating point of a voltage-divider biased BJT — base voltage, emitter current, collector voltage and whether it is in the active region.
• Voltage Divider Calculator Output voltage of a two-resistor divider, with the current it draws and a warning when the load will disturb it.
• Zener Diode Calculator Series resistor for a Zener shunt regulator, with the worst-case power dissipated in the diode and the resistor.