spin-a-split and series/parallel?

[bonzerinc]

OK- it's easy to rig up a series/coil cut/parallel switch for a 4-lead humbucker. Can the coil cut be functionally replaced with a spin-a-split?

It seems to me, with my limited knowledge, that the spin-a-split setup is incompatible with a series/parallel switch. With the s-a-s, you're taking a series configuration and just gradually grounding one coil out. Right?

So you need four leads to do the s-a-s, but once you put the pickup through a series/para switch you've only got two leads.

Once you've gone through the s-a-s, you're committed to a series-only configuration.

Any way to reconcile the two? I'd like to get as many pickup combinations (and knobs!) as I can on the lap steel I'm making.

Thanks!

 

[Artie]

Re: spin-a-split and series/parallel?

You can do anything with electronics. However . . . beer and technology don't mix.

If no one else fills you in, I'll cover it tomorrow.

Artie

BTW - Welcome to the forum.

 

[hamerfan]

Re: spin-a-split and series/parallel?

Artie its your job! get yourself a strong cup of coffee and go!

 

[Artie]

Re: spin-a-split and series/parallel?

Using an on-on-on switch, spin-a-split is only active when in the full humbucker mode. This also allows you to switch back and forth, instantly, between full-split and partial split to hear the difference.

 

[Natman]

Re: spin-a-split and series/parallel?

Ok, so if I got this right, the switch is only for the series mode correct? Any idea if the spin-a-split is useful in parallel? I may very well go for this in my setup! I love this place!!!!!

 

[bonzerinc]

Re: spin-a-split and series/parallel?

Thanks, ArtieToo! That's an EASY change to make to my design. Too easy, in fact. How could you also incorporate the spin-a-somethin-ruther as discussed in this thread:

https://forum.seymourduncan.com/showthread.php?t=54434

Thanks again and yeah, I love this place, too. Lots of great information.

-Bonzer

 

[Artie]

Re: spin-a-split and series/parallel?

Any idea if the spin-a-split is useful in parallel?

I don't think you can really do spin-a-split in parallel.

Thanks, ArtieToo! That's an EASY change to make to my design. Too easy, in fact. How could you also incorporate the spin-a-somethin-ruther as discussed in this thread:

I'll have to think about that for awhile. It might be possible.

 

[bonzerinc]

Re: spin-a-split and series/parallel?

OK- I've been trying to figure this out, and I think I've got something potentially interesting. I don't know squat about electronics- this is just cobbled together from various sources, so please be nice when you tear it apart.

I added a SPDT (that's the 1 and 2 in the diagram) to switch the red lead to a usual series/cut/parallel DPDT or through a spin-a-something-ruther.


I *think* what happens is this:

With the DPDT in series and SPDT in 2, you have a regular spin-a-somethin-ruther. With the SPDT in 1, you have a sort of spin-a-split where at one extreme, coil A is either sent to ground or through a capacitor to... nothing. So is this just a spin-a-split, or does the pot do nothing, or does it go back to being a tone knob?

With the DPDT in cut (middle position) and SPDT in 1, you get a regular coil cut. With SPDT in 2, you get that same sort of almost-a-spin-a-split, but with coil B going to ground or nothing, and in the opposite direction though the pot. Right?

With the DPDT in parallel and SPDT in 1, you get parallel. With SPDT in 2, you get the same pseudo-spin-a-split with coil B.

And- just to complicate things further- if I put a 500K resistor in series with that cap, then put DPDT in series and SPDT in 2, don't I end up with the Adjust-a-mud mentioned here:

https://forum.seymourduncan.com/showthread.php?t=52396&page=2

If I put that resistor through an on/off switch, what effect would it have on the pseudo-spin-a-splits in each of the above DPDT settings?

Unless I hear back that this is pure idiocy, I'll be wiring this thing up by the weekend, I hope. I'll let y'all know how it turns out. If it works, I'm calling it the BonBon-a-split.

Thanks for reading,
Bonzerinc (aka BonBon)