[sdiy] Polyphase transformers

[Richie Burnett]

Polyphase transformers just perform vector additions of the waveforms 
applied to them...  So they can be used to play tricks with the relative 
phases of 3-phase sinusoidal voltages applied to them in power distribution 
systems.  (E.g. Look up the "24-pulse rectifier" for an example of how 
something called a "star-delta transformer" is used to generate 3 additional 
phases with offsets of 30 degrees from each of the existing 3-phase supply 
line voltages.)

Unfortunately a polyphase transformer doesn't impart any time delay to 
signals passing through it like you would need to implement something like 
an audio phaser.  Effectively it is just a mixer performing vector addition 
of the multiple input phases.

3-phase transformers also tend to weigh 300lbs and need a flatbed truck to 
move, so probably not ideal for Synth DIY !?!?!?

-Richie,