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Don  Lancaster's Guru's Lair  SL-28NDE JavaScript Magic Sinewave Calculator
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This interactive demo lets you find values and explore numerical
tolerances on an 7 pulse Steplock-28 Magic Sinewave.

You can click here for Tutorials and further support.
You can click here for calculator User Guidelines.
You can click here for minor Design assistance.
You can click here for major Development assistance.

To find a magic sinewave:

Select the type of magic sinewave desired using the radio buttons.
Then click on the the Coarse Amp Adjust button.
Select the precision desired using the radio buttons.

Enter the desired amplitude (0.01 to 1.00) in the Target Amplitude box.
Or the desired power (0.0001 to 1.00) in the Target Power box.

If the present Fundamental is "far" from your Target Amplitude, OR
if you changed the type of magic sinewave selected, be sure to click the
the Coarse Amp Adjust button. Then click the Fine Amp Adjust button
repeatedly until the accuracy stops improving.

If the present Fundamental is "near" to your Target Amplitude, click the
Fine Amp Adjust button repeatedly until you get your desired accuracy.

Note that the zero-to-peak sinewave amplitude is normalized to the supply
voltage, that the harmonics are RELATIVE to the fundamental, and that
~only~ the THD is shown as a percentage.


The quantization buttons added to this version will show the distortion
attainable for different amplitude storage bit lengths. Use these buttons
only AFTER optimization and reoptimize after each use.

This version has added partial differential calculation for higher speeds.
It also provides for a new "Near Best" magic sinewave option that is
directly calculatable and exceptionally fast. A "Near Best" allows one
or two of the highest controlled harmonics to assume "low", rather than
true zero values. Partial diff calc is not yet available for delta options.

To explore magic sinewave tolerances:

Make a desired change in one or more of the pulse position degree values.
Press Recalculate to find the current amplitude and distortion levels.
Press Find Nearest MS to find the closest fitting magic sinewave.

To explore limiting data table amplitude accuracy:

Optimize the magic sinewave. Then click on ONE quantization button to view
the attainable distortion. Reoptimize before changing your quant selection.