Phase Switching with Humbuckers
If you haven't read it yet, see the Phase page first.  This page covers two ways to apply that principle in guitars with humbuckers: reversing the phase of a humbucker relative to the other pickup and reversing the phase of a single coil within a humbucker.



Phase switching with a guitar with humbuckers
Although this is the same figure as I used on the Phase Switching for Strats page (sorry; too lazy to make a new one), the principle is essentially the same.  Just follow the same scheme with the two leads (i.e., the (+) and the (- )) from your pickup on the bottom lugs.  Don't worry about the other two just yet.  The 5-way switch is whatever pickup selector you're using (3-way, etc.).

The illustration shows how to put a phase reversing switch on a push-pull pot (I don't have the pot wired in this picture; it can serve any function).  You don't have to use a push-pull pot as any DPDT (double pole-double throw) switch will work.

The bottom configuration (the way it would be if you had the push-pull pushed) is the normal phase (what I call "in phase"; i.e., no cancellation).  The top (pulled) configuration produces a phase cancellation between coils..


Phase switching within a humbucking pickup:
This modification can be performed on one or several humbucking pickups within the same guitar.  The theory is the same, it is just that the phase switching is performed on what would be considered half of one pickup.  The sections below describe the wiring within individual humbuckers.

Series, out of phase
This scheme throws the two coils out of phase with one another.  There is less output produced than standard wiring because the pickups are effectively canceling one another out except for the differences in their respective sounds (which isn't much if the two are close to one another).
 
Side by side comparison

At left is the standard in-phase wiring.  At right, the bottom coil has been electrically reversed to be out of phase, but the connections are the same.

Parallel, out of phase
This is much the same as the above wiring scheme.  Once again the coils almost completely cancel one another out.  This is useful for more exotic applications, but nothing you would use all the time.

 
Side by side comparison

At left is parallel in-phase wiring.  At right, the bottom coil has been electrically reversed to be out of phase, but the connections are the same.



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