How do it work? Chorus, flanger, phase shifter?

[ric426]

From a semi-technical standpoint, how do these three effects do what they do? They're all modulation effects, but how do they differ and how are they similar?
From what I understand, chorus is based on a modulated delay, but is it a delayed signal mixed with a straight signal with the delay constantly changing via an LFO? What's the typical range of delay used?
What about flanging? I know it was originally accomplished by playing back two identical tapes roughly in sync and delaying one by dragging a finger on the flange of the tape reel. How is it accomplished electronically? Seems like it's a variation of the same method as chorus. Different delay range? Different modulation source?
That brings us to phase shifting. Obviously it involves shifting the relative phase of two signals, but how is the phase shift accomplished, how is it modulated and how much of an actual phase shift is typical?
I'd appreciate any links to articles or threads that explain these effects in moderately technical terms. I'm not an EE or math genius, but I do have a decent technical background.

[niftydog]

Try geofex.com. Good article on phasers and flangers.

It is essentially subtle differences in delay time that make the difference.

[bongomania]

That plus subtle differences in regeneration (chiefly the difference between chorus and flanging).

[bassman03]

http://users.sa.chariot.net.au/~gmarts/fx-desc.htm

This site should tell you just about everything you need to know