Actual Reverse Winding

[fieldwrangler]

Anyone know if DiMarzio was in the habit of actually winding the two coils on their rail-style single coil size pickups in opposite directions instead of just doing The Usual?

[David Schwab]

Anyone know if DiMarzio was in the habit of actually winding the two coils on their rail-style single coil size pickups in opposite directions instead of just doing The Usual?

I doubt it. I can't think of any humbuckers wound that way. By winding them all the same direction, they can do all the coils at the same time.

[CRU JONES]

Anyone know if DiMarzio was in the habit of actually winding the two coils on their rail-style single coil size pickups in opposite directions instead of just doing The Usual?

That is an interesting idea

I haven't seen the bottoms of a dimarzio bobbin, but it could be the same as the top. I think I will have to try this! Thanks for the idea!

Ethan

[David Schwab]

That is an interesting idea

I haven't seen the bottoms of a dimarzio bobbin, but it could be the same as the top. I think I will have to try this! Thanks for the idea!

Ethan

What do you mean, turning a coil upside-down? DiMarzio coils have a top and bottom. The wires come out og the bottom of the bobbin and connect to a printed circuit board. I'm quite sure they are wound the same direction since that's how you wire them up. The North finish (black) connects to the South finish (white). If you wound the coils in opposite directions, you would be wiring the North finish to the South start.

It really doesn't matter which way you do it.

With single coil pickups, the start is usually ground, and they are wired in parallel. So by reverse winding, you keep the grounds close to the magnets for less noise. With series connected pickups it doesn't matter since the start of the second coil is not going to be at ground.

[CRU JONES]

Bob, you want dibs on this? David got me real good on the tone cap one, so I kinda feel like this one is mine
Ethan

[fieldwrangler]

As they used to say on Perry Mason, "The Court is Yours..."

[big_teee]

I've rewound some 70s P-Bass Pickups.
They do the true reverse wiring.
They were wound with PE.
From the Pot, the Hot Lead, wired to the start of the CCW Treble string bobbin (North Up).
The finish of the CCW bobbin tied to the Start of the CW Bass String bobbin(South Up).
Then the finish of the CW bobbin ties to Brass Ground Plate.
That could be turned around easy enough if you wanted the start of one coil grounded.
So the Options on wiring Buckers are pretty much endless.
Good Luck,
B_T

[David Schwab]

They do the true reverse wiring.

Is there a such thing as false reverse wiring?

The original question was about the DiMarzio dual rail pickups. They are wound in the same direction. So are the Duncan dual rail pickups.

The only reason Fender wound any reversed is because of the magnets picking up noise.

[big_teee]

Is there a such thing as false reverse wiring?

The original question was about the DiMarzio dual rail pickups. They are wound in the same direction. So are the Duncan dual rail pickups.

The only reason Fender wound any reversed is because of the magnets picking up noise.

RWRP.
Knit Pick if you want.

[David Schwab]

RWRP.
Knit Pick if you want.

I'm talking about the wording "true reverse wiring". Either it's wired in reverse or it ain't! There's nothing "true" about it. That makes it sound like it's up on a pedestal, like "true bypass", which is another thing made more important than it is.

But why would you want to do this for dual blade Strat humbuckers? Or Gibson humbucker for that matter? What benefit do you expect from it?

RWRP is not anymore "true" than reversing the wires on one coil, as Gibson does. The electrons don't care if they are going from the inside to the outside or vice versa. It's only done because they are winding right on non grounded magnets.

Please don't make it into something "magic."

[fieldwrangler]

I'm talking about the wording "true reverse wiring". Either it's wired in reverse or it ain't! There's nothing "true" about it. That makes it sound like it's up on a pedestal, like "true bypass", which is another thing made more important than it is.

But why would you want to do this for dual blade Strat humbuckers? Or Gibson humbucker for that matter? What benefit do you expect from it?

RWRP is not anymore "true" than reversing the wires on one coil, as Gibson does. The electrons don't care if they are going from the inside to the outside or vice versa. It's only done because they are winding right on non grounded magnets.

Please don't make it into something "magic."

In fact, I, for one, haven't really dug into the question of whether or not it either "should" make a difference or "does" make a difference (besides the issues of capacitive coupling between the inner winds and the cores), but I plan to do "thought experiments" and "empirical experiments" to address both questions in the coming weeks.

Bob Palmieri

[David Schwab]

(besides the issues of capacitive coupling between the inner winds and the cores)

It's always going to be the inner winds coupled with the core no matter which direction it's wound. The only thing changing is if it's the start or finish. And why would that matter?

I tried winding my humbuckers with reversed coils for a while. It didn't change the tone, and got to be confusing when winding a bunch of pickups, so I went back to winding them all CCW.

You can make some tests though. Just take one bobbin in a humbucker and flip it over and swap the outputs leads. Now it's reverse wound.

[CRU JONES]

As they used to say on Perry Mason, "The Court is Yours..."

LOL

First off: In the "strat blade humbucker" design, capacitance will dominate (hot tip ). the bobbin is quite thin(distance) and the blade is a massive "Plate" (area)... We all know the formula for capacitance. (Actually, It's in my notes... I couldn't find it)

As a note: the blades will be grounded to prevent electrostatic noise. This is basic, but an important assumption.

So, the difference between "faux RWRP" and real "RWRP" is capacitance.

Distance and Area are important to capacitance, but we also need to take into consideration "electrical potential". For instance: if we ground the "start" winding, the rest of the coil is essentially "shielded" from the capacitance of the blade. The blade and the winding are at the same electrical potential... So, that might be the way we want to go to minimize capacitance. But, if we want the "finish" to be grounded for shielding of external electrostatic noise purposes, then we have developed capacitance (to ground) on the inside and outside of our coil...


So that is one coil of a humbucker. The grounded side coil and it's two possibilities. up to the designer.

Now for the other coil in a humbucker configuration...

If we only use the standard "faux" RWRP... Then we have no choice, we wire it up based on our decision for the first coil.


The reason I like Bob's question so much is: It made me realize we DO have the choice of which part of the coil to put next to that massive plate! So, here is the question: do you want to have the "hot" part of the winding next to that Blade? Or do you want the "series connection" part of the coil next to that Blade? Which part of the second coil is at greater electrical potential?


Its up to you the designer. As Bob points out, we actually do have a choice!

Thanks Bob!

Ethan

[CRU JONES]

I'm talking about the wording "true reverse wiring". Either it's wired in reverse or it ain't! There's nothing "true" about it. That makes it sound like it's up on a pedestal, like "true bypass", which is another thing made more important than it is.

But why would you want to do this for dual blade Strat humbuckers? Or Gibson humbucker for that matter? What benefit do you expect from it?

RWRP is not anymore "true" than reversing the wires on one coil, as Gibson does. The electrons don't care if they are going from the inside to the outside or vice versa. It's only done because they are winding right on non grounded magnets.

Please don't make it into something "magic."

So... Are you admitting to "faux RWRP"'ing your humbuckers?

[David Schwab]

LOL

First off: In the "strat blade humbucker" design, capacitance will dominate (hot tip ). the bobbin is quite thin(distance) and the blade is a massive "Plate" (area)... We all know the formula for capacitance. (Actually, It's in my notes... I couldn't find it)

You are making incorrect assumptions. Capacitance will not dominate. The bobbin is not all that thin either. Have you made any of these?



Notice the ratio of coil to core. Now look at a Strat pickup. Fatter coils and also fatter cores.

Also, how about these pickups?



No "massive" plate. Lots are air space between poles.

As a note: the blades will be grounded to prevent electrostatic noise. This is basic, but an important assumption.

You should ground all your metal parts in pickups, including alnico rod magnets. It doesn't change the tone however. Also, Fender doesn't do it.

So, the difference between "faux RWRP" and real "RWRP" is capacitance.

How do you figure? Think about it for a minute.

For instance: if we ground the "start" winding, the rest of the coil is essentially "shielded" from the capacitance of the blade.

You're joking, right? The rest of the coil is still next to the grounded end of the coil. There is not a separation in-between the ground and hot ends of the coil, it's continuous. All coils have internal capacitance. How is it shielded from the rest of the coil? If you remove the grounded steel core, there is still one end of the coil at ground. It still has capacitance.

And let's note that Fender pickups do not have grounded magnets. So it doesn't matter if the start or finish is grounded. It's very easy to demonstrate for yourself. Take a single coil pickup and wire it to a polarity reversing switch. Now switch the switch back and forth. Do you hear a change in tone? You wont.

The blade and the winding are at the same electrical potential... So, that might be the way we want to go to minimize capacitance. But, if we want the "finish" to be grounded for shielding of external electrostatic noise purposes, then we have developed capacitance (to ground) on the inside and outside of our coil...

One end of the coil is at ground. How many turns away from that does it change? The coil has resistance. Each turn increases the resistance. So now we are 1,000 turns into the coil. Is the end closest to the start still at the same potential as the start? And we have also put some distance between the blade and where we are now. However, each turn of wire is much closer to the previous turn.

Also having the finish of the coil at ground does not provide shielding. Once again, how many turns do you have to go to get away from ground potential?

So that is one coil of a humbucker.

Now for the other coil in a humbucker configuration...

And here's where it all comes crashing down...

If we only use the standard "faux" RWRP... Then we have no choice, we wire it up based on our decision for the first coil.

Here's why your reasoning is flawed. Lets look at a series connected humbucker. Let's say the start is ground. Then you have the finish connected to the next coil. If that coil is reverse wound, that would also be the start. Where is that start compared to ground? It's in the middle of the coil, since the two coils are connected in series. Any benefits here?

Now, let's wind both coils the same and wire them finish to finish. Now where is the start of the second coil. it's at the "virtual" finish, since it's at the end of our series connected coils. Any benefits here?

The reason I like Bob's question so much is: It made me realize we DO have the choice of which part of the coil to put next to that massive plate!

You are over thinking. There is no massive plate. The blades on Strat rail pickups are very thin. It's less metal than what's in the slug coil on a humbucker, or the rod magnets in a Strat pickup.

Since you have obviously never tried it, go ahead and try it. Here's an EASY way to try it.

Here's a dual rail Strat pickup. Note the really thin blades.



So let's pretend I wound this pickup, and both coils are wound the same.

Now lift one coil off the blade, like this, and flip it over. Now it's wound in reverse.



Real easy to test. Do you know what you are going to hear different? Nothing. But by all means try it yourself.

So, here is the question: do you want to have the "hot" part of the winding next to that Blade? Or do you want the "series connection" part of the coil next to that Blade? Which part of the second coil is at greater electrical potential?

Come on man, it's all part of the same big coil! In a humbucker it's in series. You are never going to have the start of both coils near ground because there is only one start! Don't you see that?



See? it's one big coil. It doesn't matter what direction the second half is going. That only matters for hum cancelation.

We can see that it's probably a good idea to have the blades grounded, and the start also grounded. But now we have the second coil. It's start is going to NOT be at ground.It will be thousands of turns in. But it will be next to the grounded blade. See the conundrum? So if your start being ground is good for capacitance, you just flushed that down the toilet with the second coil, since it's start will never be anywhere near ground potential. Do you see it now?

Its up to you the designer. As Bob points out, we actually do have a choice!

Ethan, what choice is that? Your second coil will either have the start, which is, let's say 4,000 turns in, near the blade or not. How is that going to matter?

As a designer you can decide you want green magnet wire. That also wont change the tone, and will just look ugly!

I say to you to try it out. I have many times. It was not worth the effort to reverse wind one coil in a humbucker, so I stopped doing it. Ask yourself why its not done?

The original question was does DiMarzio do it? No, they don't. Why don't they? Why doesn't any of the pickup makers do this with humbuckers? because once you are at the second coil, it doesn't matter unless they are wired in parallel.

Here's how this question should have gone; "Has anyone tried winding a blade humbucker up RWRP, and did it make any difference in tone?"

The answer from me is, yes, and no. And my blade humbuckers have much more massive blades than dual rail strat pickup.