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SGD Lutherie Pickups

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#643
Shoewreck said:
Can the P be wired as two non-humcancelled dual coils? I'm thinking about constant impedance humcancelled switching between PJ pickups.
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The P is set up like two interlaced split-coil pickups like this:

Code: 
XXX|OOO
OOO|XXX

Each set (X or O) is in series. Then you have the two wires from each of those, as you would on any dual coil humbucker.

This way you can wire the whole thing in series, or in "single coil" mode where you get either the X or O set. Depending on how you wire it, you can use one or the other pair of coils in single coil mode. In parallel you get the two series pairs, but in parallel of course.

So you can set it for series for solo use, and then single coil for use with the J. The single coil mode is like a P with half as many turns. Series is close to a P tone, but with more definition because of the coil arrangement and neo magnets. Each half of the P has about the same aperture as one of my Wide neos, just a little narrower (1/2").

I spent a while trying to come up with a good way to wire it, so you would get a few useful tones all with hum cancelation.

I suppose I can supply it with all the coil connections for the adventurous. The only thing you would gain there is wiring the two coils from the X or O set in parallel.
 
#644
SGD Lutherie said:
The only thing you would gain there is wiring the two coils from the X or O set in parallel.
Click to expand...
There's one more thing to gain: when a Neo J is split, the single coil isn't humcancelling. Pairing one X and one O coil of a P would also make non-humancelling pair. Together, these three coils would be humcancelling and, impedance-wise, similar to whole P or J alone.
 
#645
Shoewreck said:
There's one more thing to gain: when a Neo J is split, the single coil isn't humcancelling. Pairing one X and one O coil of a P would also make non-humancelling pair. Together, these three coils would be humcancelling and, impedance-wise, similar to whole P or J alone.
Click to expand...

That's true, but the Neo Jazzbucker in parallel sounds pretty much like it does split.

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You only get a weeny bit more top end.

Impedance wise, the Neo P is wound more like the Neo J. It's wound with thinner wire though, so the DC resistance reads higher.

But as I said, I can supply it with 8 conductors.
 
#647
Shoewreck said:
What are dimensions of the narrower ND4 "Jazzbucker" module? I'm feeling like making a pair of wooden enclosures of uncommon shape, but don't know the required route size to start with.
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The cavity is 3.5" (89mm) long, .65" (15.5mm) wide, and .8" (20.3mm) deep.

The neck and bridge bobbins are the same length.
 
#650
TapyTap said:
David,

Have you tried making a "split-blade" neodymium Jazz humbucker? I'm thinking of something like your ND3-J4 but with the two steel blades placed end-to-end: ++++ | ----
Click to expand...

No. I had thought about it in the beginning, but the problem with split coil pickups is when you move to odd numbers of strings, like with a 5 string. Then you have to worry about the string spring on that particular bass so the gap lines up in the right spot. Also, my Jazz pickups work with 4 or 5 string basses as long as they use standard jazz size pickups. They would work with 3 or 6 string basses too.

For a single coil tone, I went with the Sidewinders. They use a single blade so they sense the strings like a real single coil. I use ceramic magnets in the Sidewinders however.

But I could do a split Jazz neo pickup. My P pickup is basically a split neo Jazzbucker in two cases, but with a wider aperture.
 
#651
SGD Lutherie said:
No. I had thought about it in the beginning, but the problem with split coil pickups is when you move to odd numbers of strings, like with a 5 string. Then you have to worry about the string spring on that particular bass so the gap lines up in the right spot. Also, my Jazz pickups work with 4 or 5 string basses as long as they use standard jazz size pickups. They would work with 3 or 6 string basses too.
Click to expand...

Thanks David. The gap between coils could definitely be an issue with some string spacings.

SGD Lutherie said:
For a single coil tone, I went with the Sidewinders. They use a single blade so they sense the strings like a real single coil. I use ceramic magnets in the Sidewinders however.

But I could do a split Jazz neo pickup. My P pickup is basically a split neo Jazzbucker in two cases, but with a wider aperture.
Click to expand...

How might a neodymium based SW4-J4 compare with the tonality of a split Jazz neodymium pickup? (I could be wrong about this, but I am thinking that luthier Jerzy Drozd's JeDXS single coil split pickups are neodymium based.)

Bryan
 
#652
TapyTap said:
Thanks David. The gap between coils could definitely be an issue with some string spacings.
Click to expand...

Yeah, I just wanted to avoid the whole issue.

However, I'm now making a neo P pickup.

How might a neodymium based SW4-J4 compare with the tonality of a split Jazz neodymium pickup? (I could be wrong about this, but I am thinking that luthier Jerzy Drozd's JeDXS single coil split pickups are neodymium based.)

Bryan
Click to expand...

If you listen to the clip of the Neo P in "single coil" mode, that would be very close to that tone.

I have been toying with making some split coil Jazz pickups with exposed poles and all, but with neo mags.
 
#655
Shoewreck said:
Corner radius is about .16", right? Could there be a shorter version? Say, 3" long.
Click to expand...

You can get an idea of the coils here:

neojazzbuckerlayout.png


I can make them any length you need, shorter or longer.
 
#659
SGD Lutherie said:
Here's some VERY rough sound samples. I don't own a P bass, so this is installed in my eight string bass, which has a 32" scale length, and is strung up with a somewhat old set of Rotosound Stainless Swing Bass 66s. The frets are buzzy and the test pickup lacked shielding, and there were wires hanging out, so it was a little buzzy.

The pickup has three modes available, via a 3-way toggle switch, push/pull pots, etc.. Those are series, split single coil, and parallel.

The series and parallel models are dual rail humbuckers in each half. The single coil mode is one coil from each half.

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It was recorded direct to an M-Audio FireWire Solo.
Click to expand...

Just to clarify, did you place the Neo P in a "typical" P-bass position when you recorded these samples?
 
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