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This modification allows a 3 single coil guitar to switch from neck
and middle in series to middle and bridge in series. In essence,
it is switching from something similar to a neck humbucker arrangement
to a bridge humbucker arrangement.
Stereo Guitar Wiring
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This diagram shows two pickups wired in stereo.
![]() This diagram shows a tone control that has a switching option for choosing 2 capacitor values. The switch is a Single Pole Double Throw (SPDT). Suggested values for the capacitors would be .02 and .047 mfd.
![]() The wires shown from neck pickup, etc are the "hot" wires. The ground wires are not shown but they would be connected to each other and connected to the output ground.
Look at this diagram to see how this works: ![]()
![]() Look at this diagram to see how this works: ![]()
This modification requires that the guitar have 3 humbucking pickups,
each of which is wired with a series/parallel switch.
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![]() He also added 2 DPDT switches for "out-of-phase" tones and a single pole triple throw rotary switch for selecting different capacitors. This results in 17 different pickup combinations(see table below), with 22 additional sounds enabled by the phase switches on the neck and bridge pickups and all of that multiplied by the 3 tone circuits, producing an incredible tone monster. ![]()
![]() Each switch is DPDT center OFF. (Actually, at most, you'd just need 2 phase switches to get all possible phase combinations and you could replace any one of the switches with an SPST. Just something to think about.) Since, the switches are center off, you get the 7 choices of each single coil, middle & neck, middle & bridge, neck & bridge and all 3. Out of phase sounds have their place, but being able to get all possible in and out of phase combinations may not be worth the effort. Even John Atchley, the designer of this circuit has said "I've quit building these particular modifications because I didn't find the phasing to be that tonally useful." It does seem to be overkill regarding phasing, but the idea of using 3 SPST toggles to control the pickup selection is very convenient. If you want to see those diagrams, go to Page 1 and look at "3 Single Coils Wired In Parallel" and "3 Single Coils Wired In Series".
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