[sdiy] phaser cv law

[Paul Perry]

This is very interesting & potentially useful.
One thing about incandescent vactrols though, is the
thermal inertia of the filament, which has a considerable 
effect on the overall current/resistance transfer, particularly
at high frequencies.
In some guitar phasers, this is relied on to decrease depth 
as the LFO frequency increases (useful because phasing
or tremolo seem more intrusive at higher rates).

One popular phaser LFO waveform is derived by taking 
a sine wave, full wave rectifying it, and inverting the 
result (giving a slowly swept botom & fast swept peak).

paul perry Melbourne Australia