# Calculator Index

These calculators are written in JavaScript and will function in most modern browsers. Further information is available in About our calculators

ac Networks

A useful collection of calculators giving the impedance and reactance of simple ac networks.

Amplifier dc Conditions

Determines the dc conditions of a variable configuration amplifier.

Characteristic Impedance

Computes Delay, Velocity Factor, Effective Dielectric Constant and Characteristic Impedance of a PCB track.

Circular Capacitor

For a parallel plate, circular capacitor, showing the formula by Kirchhoff.

Coplanar Waveguide With Ground

For Coplanar Waveguide with ground or Microstrip lines with signal side ground plane, showing the formula by Brian C Wadell.

Elliptical Integrals of the First Kind

With equations, for solving Elliptic Integrals of the First Kind.

Flat Wire Inductor

For a flat wire, ribbon or PCB track showing the formula used.

Matching Pi Attenuator

A two part calculator which gives ideal and preferred value resistors, showing most formulas used and a link to the others.

Matching T Attenuator

A two part calculator which gives ideal and preferred value resistors, showing most formulas used and a link to the others.

Microstrip Characteristic Impedance Calculator Using a Formula by Brian
C Wadell

Used for calculating the Zo of PCB transmission lines, showing the formula used.

Microstrip Characteristic Impedance

Uses a formula from an article by Rick Hartley and shows the formula used.

Microstrip Characteristic Impedance, Using The IPC-2141 Formula

Uses a formula from an article by Polar instruments, showing the formula used.

PCB Sample Size Calculator for Relative Dielectric Constant Measurements

Selects the optimum size for a circular plane on a PCB. This is used for making relative dielectric constant measurements using a Vector Network
Analyser.

Pi Attenuator

Gives resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator.

Rectangular Capacitor

For a rectangular parallel plate capacitor with edge effect, showing the formula used.

Rectangular Conductor Resistance

For a rectangular cross section conductor such as a PCB track, showing the formula used.

Relative Dielectric Constant Calculator for a Circular Capacitor

Based on a formula by Kirchhoff for a circular capacitor, showing the equations used.

Resonance

For a capacitor / inductor tank circuit, showing the formula used.

Return loss and mismatch loss

Active return loss and mismatch calculator with results for absolute impedance, return loss, VSWR, reflection coefficient and mismatch loss

RF Trap With Attenuators

Computes attenuation, return loss, reflection coefficient and VSWR . This calculator is specific to the circuit used in the RF Trap With Attenuators
FLEXI-BOX.

Round Wire ac Resistance

Gives the ac resistance of a round straight wire using common conducting materials.

Round Wire Impedance

Gives the impedance of a round straight wire using common conducting materials.

Round Wire Inductance

Gives the inductance of a round straight wire using common conducting materials.

Round Wire dc Resistance

Gives the dc resistance of a round straight wire using common conducting materials.

Skin Effect Depth

Calculates the skin effect depth for copper at a particular frequency.

Spreadsheet

An Excel spreadsheet with many simple calculations in 'blocks' that can be built up into fairly complex calculations by simply making the input cell
of any block equal to the result of any other block. May take two or three goes before it will download!

T Attenuator

Gives resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator.

These calculators are provided free by Chemandy Electronics in order to promote the FLEXI-BOX