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Cool trick for MegaSwitches!
I just figured out a general purpose design using a DPST switch with a MegaSwitch to toggle two coils between a parallel and a series linkage. In particular I was seeing what I could come up with on my Brawley guitar, which has two pots and a selector switch mounted through the body.
http://www.blueguitar.org/new/schem/...emplate_sm.gif
The logic behind this is simple- one pole goes to HOT, one pole goes to ground and the other two poles are connected to the DPDT switch which will select between a series and parallel linkage between the two coils selected by the megaswitch. (If you want to use a single coil or pickup for a particular position of the selector switch, then just hook it up to the HOT and ground poles and ignore the two poles connected to the DPDT switch.
Here is what I'm doing with my Brawley:
http://www.blueguitar.org/new/schem/...er_harness.gif
http://www.blueguitar.org/new/schem/...harness_wd.jpg
A text explanation follows:
#1 Neck * Bridge[screw coil] . . . Alt - Neck + Bridge [screw coil]
#2 Middle * Neck . . . . . . . . . Alt - Middle + Neck
#3 Neck * -Bridge[stud coil] . . Alt - Neck + -Bridge[stud coil]
#4 Middle * Bridge[stud coil] . . .Alt - Middle + Bridge[stud coil]
#5 Bridge [series hb] . . . . . . .Alt - Bridge [parallel hb]
1. N*B(o). + -> N(w)
. . . . . . . . N(b) -> B(r)
. . . . . . . . . . . . .B(g) -> gnd
1A. N+B(o) + -> N(w) & B(r)
. . . . . . . . N(b) & B(g) -> gnd
2. M*N . . . .+ -> M(w)
. . . . . . . . . .M(b) -> N(w)
. . . . . . . . . . . . . .N(b) -> gnd
2A. N+M . . . + -> M(w) & N(w)
. . . . . . . . . .M(b) & N(b) -> gnd
3. N*[-B(i)] + -> N(w)
. . . . . . . . . N(b) -> B(w)
. . . . . . . . . . . . . B(b) -> gnd
3A. N+[-B(i)] + -> N(w) & B(w)
. . . . . . . . . .N(b) & B(b) -> gnd
4. M*B(i) . + -> M(w)
. . . . . . . . .M(b) -> B(b)
. . . . . . . . . . . . .B(w) -> gnd
4A. M+B(i) + -> M(w) & B(b)
. . . . . . . . M(b) & B(w) -> gnd
5. B(i)*B(o) . + -> B(b)
. . . . . . . . . . B(w) -> B(r)
. . . . . . . . . . . . . . B(g) -> gnd
5A. B(i)+B(o) . + -> B(b) & B(r)
. . . . . . . . . . .B(w) & B(g) -> gnd
Legend:
on the left...
* indicates SERIES linkage
+ indicates PARALLEL linkage
- indicates that the coil is Out Of Phase (OOP)
B(i) is the Inner (stud) coil of the Bridge humbucker
B(o) is the Outer (screw) coil of the Bridge humbucker
on the right...
+ indicates the Hot signal lead from the Volume pot
gnd indicates the signal return or ground connection
-> indicates continuity between the two adjacent terms
N(w) and N(b) are the two leads from the Neck pickup
M(w) and M(b) are the two leads from the Middle pickup
B(b) B(w) B(r) B(g) are the HB leads with Duncan color codes
--Enjoy!
Steve Ahola
P.S. "Looks great, Steve, but what if you want to use the Neck or Middle pickups by themselves?" I'm glad you asked, Mr. Too-Busy-To-Leave-Your-Name... I further modified the design by adding a second DPDT push-pull pot (as shown in the drawings) which will ground out the black leads coming from the Neck and Middle pickups, which will give you those pickups alone in Positions 1 -4 in Series mode.
http://www.blueguitar.org/new/schem/...emplate_sm.gif
The logic behind this is simple- one pole goes to HOT, one pole goes to ground and the other two poles are connected to the DPDT switch which will select between a series and parallel linkage between the two coils selected by the megaswitch. (If you want to use a single coil or pickup for a particular position of the selector switch, then just hook it up to the HOT and ground poles and ignore the two poles connected to the DPDT switch.
Here is what I'm doing with my Brawley:
http://www.blueguitar.org/new/schem/...er_harness.gif
http://www.blueguitar.org/new/schem/...harness_wd.jpg
A text explanation follows:
#1 Neck * Bridge[screw coil] . . . Alt - Neck + Bridge [screw coil]
#2 Middle * Neck . . . . . . . . . Alt - Middle + Neck
#3 Neck * -Bridge[stud coil] . . Alt - Neck + -Bridge[stud coil]
#4 Middle * Bridge[stud coil] . . .Alt - Middle + Bridge[stud coil]
#5 Bridge [series hb] . . . . . . .Alt - Bridge [parallel hb]
1. N*B(o). + -> N(w)
. . . . . . . . N(b) -> B(r)
. . . . . . . . . . . . .B(g) -> gnd
1A. N+B(o) + -> N(w) & B(r)
. . . . . . . . N(b) & B(g) -> gnd
2. M*N . . . .+ -> M(w)
. . . . . . . . . .M(b) -> N(w)
. . . . . . . . . . . . . .N(b) -> gnd
2A. N+M . . . + -> M(w) & N(w)
. . . . . . . . . .M(b) & N(b) -> gnd
3. N*[-B(i)] + -> N(w)
. . . . . . . . . N(b) -> B(w)
. . . . . . . . . . . . . B(b) -> gnd
3A. N+[-B(i)] + -> N(w) & B(w)
. . . . . . . . . .N(b) & B(b) -> gnd
4. M*B(i) . + -> M(w)
. . . . . . . . .M(b) -> B(b)
. . . . . . . . . . . . .B(w) -> gnd
4A. M+B(i) + -> M(w) & B(b)
. . . . . . . . M(b) & B(w) -> gnd
5. B(i)*B(o) . + -> B(b)
. . . . . . . . . . B(w) -> B(r)
. . . . . . . . . . . . . . B(g) -> gnd
5A. B(i)+B(o) . + -> B(b) & B(r)
. . . . . . . . . . .B(w) & B(g) -> gnd
Legend:
on the left...
* indicates SERIES linkage
+ indicates PARALLEL linkage
- indicates that the coil is Out Of Phase (OOP)
B(i) is the Inner (stud) coil of the Bridge humbucker
B(o) is the Outer (screw) coil of the Bridge humbucker
on the right...
+ indicates the Hot signal lead from the Volume pot
gnd indicates the signal return or ground connection
-> indicates continuity between the two adjacent terms
N(w) and N(b) are the two leads from the Neck pickup
M(w) and M(b) are the two leads from the Middle pickup
B(b) B(w) B(r) B(g) are the HB leads with Duncan color codes
--Enjoy!
Steve Ahola
P.S. "Looks great, Steve, but what if you want to use the Neck or Middle pickups by themselves?" I'm glad you asked, Mr. Too-Busy-To-Leave-Your-Name... I further modified the design by adding a second DPDT push-pull pot (as shown in the drawings) which will ground out the black leads coming from the Neck and Middle pickups, which will give you those pickups alone in Positions 1 -4 in Series mode.
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