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Calculator Widgets


These programs are distributed in the hope that they will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Most are made available under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version, but see the License conditions for each individual program.

These programs are in the form of Yahoo! Widgets which require installation of the Yahoo! (Konfabulator) Widget Engine. Yahoo! Widgets are coded in XML and javascript.

They are packaged as zipped Widgets (with extension .widget) inside a zipped folder. The code can be examined by unzipping the .widget files.

Download figures are the final download counts at the close of the Yahoo! Widget Gallery.


AC 3-Phase Calculator (Downloads: 4,317)
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This is a special purpose calculator which performs simple 3-phase alternating current calculations.

Given three of the four quantities voltage, current, power factor and power, the Widget calculates the value of the fourth.

Two formulae are used, one for line voltages and currents, the other for phase voltages and currents.

You may also use the new web version or download the files for local use in your browser.

Attenuator (Downloads: 8,525)

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Attenuator is a special purpose calculator for the design of passive resistive attenuators and impedance matching circuits.

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The Widget can assist in the design of PI-network, T-network, BT-network, B-network and L-network attenuators and impedance matching circuits. It can perform single calculations and (in symmetric cases) generate tables for later use.

Coil Inductance

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This is a special purpose calculator which calculates the properties of a single-layer air-spaced coil. Given three parameters, the Widget calculates the value of a fourth.

Convert Time (Downloads: 12,949)
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Convert Time converts local time to various other time formats.

Convert Unix Time (Downloads: 12,373)

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Convert Unix Time converts Unix time-stamps to various other time formats, including Local Time, Universal Time, NTP Time, Internet Time, Julian Date, and GPS Week. It can also function as a clock in any of its time formats.

DMXconverter (Downloads: 5,840)
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DMXconverter is a special purpose calculator Widget for use with DMX512 installations. It converts between full channel numbers and the corresponding DMX channel settings.

Easter Date

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Displays the date of Easter Sunday for a given year.

HexDeCoder (Downloads: 41,828)
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HexDeCoder is a simple hexadecimal, decimal, octal and binary number converter Widget.

There is also an option to choose a custom base/radix between 2 and 36 and an option to convert between Unicode characters and their UTF-16 or UTF-8 character encodings.

Hyperfocal Distance Calculator
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Hyperfocal Distance Calculator computes the hyperfocal distance of a lens.

Intersecting Circles Calculator

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This is a special purpose calculator which computes properties of intersecting circles.

Interval Calculator (Downloads: 7,821)
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Interval Calculator computes the date and time at the end of an interval entered by the user. Its initial use was to work out the time at which an internet auction would expire.

LCR Resonance Calculator

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image Version 1.1

This is a special purpose calculator for the analysis of LCR resonant circuits.

Lensmaker

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image Version 1.0

This is a special purpose calculator which computes the optical power of a lens using the Lensmaker's Equation.

Lunar Date (Downloads: 14,743)
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Lunar Date converts between Gregorian dates and approximate lunar dates. It also displays the Julian date and the day of the week.

NetCalc - an RF Impedance Calculator (Downloads: 23,979)
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NetCalc is broadly based on the program NETCALC by Ian White. NETCALC was described by Ian as a simple impedance calculator for working out Radio Frequency network design ideas.

This Widget can be used on Windows and on older version of macOS (before 10.11 El Capitan).

You may also use the new web version or download the files for local use in your browser.

NGR Converter (Downloads: 5,863)

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NGR Converter is a National Grid Reference to latitude and longitude converter.

The Widget converts between British National Grid References, latitude and longitude, and IARU Locators.

Ohm's Law Calculator (Downloads: 24,545)
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This is a special purpose calculator which performs simple calculations using Ohm's Law. Given any two of the four quantities - voltage, current, resistance or power - the Widget calculates the values of the other two.

You may also use the new web version or download the files for local use in your browser.

Resistors (Downloads: 22,247)

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The Resistors Widget is a special purpose calculator which can be used to decode the colored bands on resistors (and some small capacitors).

Roman Kalculator

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This is a general purpose calculator which also features Roman numbers.

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Roman Kalculator Hex

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This is a general purpose calculator which also features Roman and hexadecimal numbers.

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Sunrise Calculator (Downloads: 20,063)
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Sunrise Calculator computes and displays the times of sunrise and sunset, given a latitude, a longitude and a date.

The Widget can make allowances for altitudes of up to 15,240 metres (50,000 feet). The altitude compensation calculation, performed by the Widget, is not part of the published algorithm, on which the main calculation is based, and should be treated with caution.

This new version also computes and displays the times of moonrise and moonset.

TLC - Transmission Line Calculator (Downloads: 2,482)

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This is a special purpose calculator which performs transmission line calculations. Various geometries are possible with the hot and cold conductors having elliptic or rectangular shapes. The Widget calculates the line characteristics and displays the voltage field.

Toric Lens Converter

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image Version 2.0

This is a special purpose calculator which converts toric lens descriptions between the two standard formats. It can also add the powers of two toric lines.

Tx Line Calculator (Downloads: 3,135)
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This is a special purpose calculator which performs simple transmission line calculations. Given three line parameters, the Widget calculates the value of a fourth. Two formulae are used, one for coaxial cable, the other for parallel line.

Wiring Calculator
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This is a special purpose calculator which performs simple wiring calculations for copper wires used in low voltage circuits. Given three of the four quantities circuit length, current, wire cross section and voltage drop, the Widget calculates the value of the fourth.

WARNING: The calculator was designed to calculate the voltage drop in low voltage (12/24 volt) marine circuits where the voltage drop due to long wire circuits is more often a problem than the current carrying capacity of the wires. No attempt has been made to ensure that the results of any of the Widget's calculations conform to current electrical codes, such as the NEC or IEC codes. Users must check these and other safety matters for themselves.

The user can choose to work in SI units or USA units.

You may also use the new web version or download the files for local use in your browser.


Sunday, September 22, 2019.