More about tires Tire sizes are expressed by the manufacturers with three sets of numbers: Tread width – Aspect Ratio – Wheel diameter (e.g. 215 55 R16) Automobile tires are…

Read More# Calculators

This category contains electronics design calculators

## Supercapacitor-Ultracapacitor discharge characteristics calculator

Super capacitor discharge time calculator. This calculator determines timekeeping operation using a supercapacitor (ultracap) based upon starting and ending capacitor voltages, discharge current, and capacitor size. Formulas used: Bt(seconds) =…

Read More## Multilayer air core inductor design calculator

The formula used in this calculation is from the famous Wheelers approximations which is accurate to <1% if the cross section is near square shaped. L (uH) =31.6*N^2* r1^2 /…

Read More## Single layer air core inductor design calculator

Winding the wire in a single layer produces an inductor with minimal parasitic capacitance, and hence gives the highest possible self-resonant frequency (SRF). Striving to obtain a high SRF and…

Read More## Flat spiral air core inductor design calculator

This is an popular coil geometri used in todays wireless charger circuits. The formula used in this calculation is based on the Harold A. Wheeler approximations for air core flat…

Read More## Planar spiral coil inductor design

The first approximation is based on a modification of an expression developed by Wheeler; the second is derived from electromagnetic principles by approximating the sides of the spirals as current-sheets;…

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