DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: alderbody on March 19, 2007, 03:51:46 AM

Title: Magnetic offset on Wah Inductors.
Post by: alderbody on March 19, 2007, 03:51:46 AM
It's a topic that has been discussed in the past, so it was about time i tried my own.

I used a pickup polepiece, as one of the forum members did, and tried it on all 4 inductors in my Wah.

The Yellow Fasel seemed to like it the most in there, while the Fulltone was the one that attracted the magnet in the strongest manner, because of the ferrous core used in these inductors. (so it's true and not BS...)

Here's how it looks like:

(http://i11.photobucket.com/albums/a192/alderbody/Various/pp_on_Fasel.jpg)


I recorded some clips, with and without the magnet attached and with or without the treble Mod.

With the Treble mod engaged, i believe the effect is not so easily audible in the clips, but it remains audible in the real world...

Generally, i think the magnetic offset adds warmth and sweetness to the Wah tone.
The sound is fatter and the "saturation" is more evident.

But you have to A/B to tell clearly.

Listen and "see" for yourselves!

http://www.diystompboxes.com/userfiles/index.php?&direction=0&order=&directory=public_downloads

Wah_YF_Lamp.mp3
Wah_YF_mag_Lamp.mp3   

Wah_YF_T_Lamp.mp3
Wah_YF_T_mag_Lamp.mp3
Title: Re: Magnetic offset on Wah Inductors.
Post by: John Lyons on March 19, 2007, 12:06:31 PM
The Magnet (on) clips for sure sounds "sweeter" Fuller, more vocal and less shrill. Nice!

Which wah circuit is this?

John

Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 20, 2007, 03:34:15 AM
Quote from: Basicaudio on March 19, 2007, 12:06:31 PM
The Magnet (on) clips for sure sounds "sweeter" Fuller, more vocal and less shrill. Nice!

Which wah circuit is this?

John



Thanks again, John!

Well, the circuit i used is based on the classic Vox, with most of the Mod-able parts  ...mod-able!...   :icon_mrgreen:

I just built it on perfboard. I needed more free space: (an older pic without the magnet)

(http://i11.photobucket.com/albums/a192/alderbody/Various/Wah2.jpg)
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 21, 2007, 03:36:22 AM
The more i play with the "magnetised" inductor, the more i realise the benefits of the added vocality and fullness/sweetness.

I think i'm gonna re-experiment with the other inductors, too.

this trick is definitely a keeper!   :icon_wink:
Title: Re: Magnetic offset on Wah Inductors.
Post by: Skreddy on March 21, 2007, 05:23:27 PM
That's the hotness.  Thanks for delivering clips that make the difference audible.  I knew I was hearing something.  :D

Again I'll warn everyone who wants to do this: don't try it with super-powerful, rare-earth magnets.  That will turn your inductor into a microphone.  :P
Title: Re: Magnetic offset on Wah Inductors.
Post by: momo on March 21, 2007, 06:51:15 PM
That sounds like an easy mod and test that I will definetly try, now about rendering the inductor a microphone, can you break the inductor if the magnet is too strong? I would be trying different strenghts but if it means possibly breaking my custon inductor then I wont try. I dont think it would be a problem since there are no moving parts,but I just want to make sure!
Thanks for this awsome tip!
Title: Re: Magnetic offset on Wah Inductors.
Post by: momo on March 21, 2007, 08:28:49 PM
 :icon_biggrin: :icon_biggrin: Yeeaaaa! Awsome,  just when I thought my modified wha was as best as it could be,.... I did not have a pickup pole handy but found a small magnet that goes on one half of a lid that magnetically latches to a small metal part on the other half, not that strong but lets say its strong enough to stay put on top of the inductor, I actually tried different positions,vertical,horizontal, and on top. The different positions dont make much difference, but what a tone!, its stinging now on the high end! and feal funky low mid on the low end!
This is so much a keeper that I used a tiny piece of blue gum,the type you use to tack posters to the wall, you rub it good in your hand and it warms up, and "tacked" it on my "Whipple inductor" from Dandy Job, unless I drop the wah I would be very surprised if it comes loose.

I will post pics soon when I get my camera back. I would also like to put up sound samples, can anyone suggest a carrier for the actual MP3's?

Note: It seems that this mod also adds a bit of distortion, even when tested clean with no other effects. I really like it, but I would be interested in knowing why this happends if anybody can chip in.
Great great mod!
Title: Re: Magnetic offset on Wah Inductors.
Post by: alextheian-alex on March 22, 2007, 01:03:27 AM
Just a thought, but you could probably pretty easily rig up an electromagnet with a coil around a piece of ferromagnetic metal.  Then you could rig up a little circuit that you could controll externally to vary the strength of the magnetic field.  I'd try it out, but I am letting a friend borrow my wah...
Title: Re: Magnetic offset on Wah Inductors.
Post by: petemoore on March 22, 2007, 01:51:21 AM
  Certainly does sound like it.
  Nice Wah clips !!
  Listening to the YF, no magnet...well it sounded alot like the YF I have in my Vox...which I've modded umpteen times, thrice for each mod I think.
  Listening to the YF with magnet, the clip sounds like it has increase of 'body' or deepness, sounds smooth too...there's some Adj.'s for my soundclip review, alot mo-different than what I'd excpected...
  I'm going to see if I can dig up the pole pieces out of the dead pickup.
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 22, 2007, 09:03:13 AM
Quote from: Skreddy on March 21, 2007, 05:23:27 PM
That's the hotness.  Thanks for delivering clips that make the difference audible.  I knew I was hearing something.  :D

great trick, man!... The Fender polepiece is the key to the magic...  :icon_mrgreen:
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 22, 2007, 09:04:47 AM
Quote from: momo on March 21, 2007, 08:28:49 PM
  I would also like to put up sound samples, can anyone suggest a carrier for the actual MP3's?

...right under your feet!...

http://www.diystompboxes.com/userfiles/index.php?&direction=0&order=&directory=public_downloads 

:icon_mrgreen:  :icon_mrgreen:  :icon_mrgreen:
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 22, 2007, 09:11:44 AM
Quote from: petemoore on March 22, 2007, 01:51:21 AM
  Certainly does sound like it.
  Nice Wah clips !!
  Listening to the YF, no magnet...well it sounded alot like the YF I have in my Vox...which I've modded umpteen times, thrice for each mod I think.
  Listening to the YF with magnet, the clip sounds like it has increase of 'body' or deepness, sounds smooth too...there's some Adj.'s for my soundclip review, alot mo-different than what I'd excpected...
  I'm going to see if I can dig up the pole pieces out of the dead pickup.

Thanks for your kind words!

The YF was purchased from Aron's online shop and it's tested for value etc...

My RF was purchased from somewhere else, without being tested pior to shipping, so i'm not sure if it is 100% within spec.

It sounds good, but i like my YF (even without the magnet) way much more.

Now, about the magnet....

...something tells me that dead fender pickups will start to gain some value on ebay...   :icon_mrgreen:

Enjoy!
Title: Re: Magnetic offset on Wah Inductors.
Post by: momo on March 27, 2007, 09:40:48 AM
Just an update on this mod, I played with it all weekend in real world situation and well, Im not sure anymore!  I did not use a pole piece magnet but a slight stronger magnet that is used to "latch" on to a lid. I think its too strong, the thing is I like the tone, but its more like a treble booster, when I kick in the wha, I get a huge boost in volume. I do like this tone , but its not versatile, if I had a second wha, then that would be used for one effect. So Ill definetly try a pole piece if I can find one.
Or maybe try to put my magnet a bit further away...
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 28, 2007, 03:55:37 AM
With the pp there are no strange effects. Just pure tonal benefit!...

try it!

Title: Re: Magnetic offset on Wah Inductors.
Post by: enigmur on March 28, 2007, 05:14:39 AM
Does this work with your average wah inductor - as in not a Fasel?

I'd be interested in giving it a go.

Cheers
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 28, 2007, 06:39:00 AM
Quote from: enigmur on March 28, 2007, 05:14:39 AM
Does this work with your average wah inductor - as in not a Fasel?

I'd be interested in giving it a go.

Cheers

yep. I just found that it suited that specific Fasel more than the other inductors in my Wah.

Title: Re: Magnetic offset on Wah Inductors.
Post by: R.G. on March 28, 2007, 11:12:25 AM
Sweet. It's good that this mod is getting some play.
Title: Re: Magnetic offset on Wah Inductors.
Post by: Paul Marossy on March 28, 2007, 02:42:07 PM
RG: Wouldn't this mod essentially create some amount of asymmetrical distortion, kind of like the one you did a study on in your Tech of the Wah article?
Title: Re: Magnetic offset on Wah Inductors.
Post by: R.G. on March 28, 2007, 03:22:27 PM
 Yes - it IS the same thing as I found in the 'magic' inductor. It's done by sticking a magnet onto the core, but it is the same effect. It causes the core to be closer to the edge of its magnetic linear range in one direction than another.

What's really clever is finding out that a fender pole piece is enough. That's sweet.

Anybody want to bet on how long it takes Dunlop to put out a "Magic Magnet" version?

:icon_lol:

Title: Re: Magnetic offset on Wah Inductors.
Post by: Paul Marossy on March 28, 2007, 05:03:19 PM
QuoteYes - it IS the same thing as I found in the 'magic' inductor. It's done by sticking a magnet onto the core, but it is the same effect. It causes the core to be closer to the edge of its magnetic linear range in one direction than another.

Huh, that's what I thought.  :icon_razz:

QuoteWhat's really clever is finding out that a fender pole piece is enough. That's sweet.

Yeah, that's pretty slick!  :icon_surprised:

QuoteAnybody want to bet on how long it takes Dunlop to put out a "Magic Magnet" version?

I wonder if they lurk here. Time will tell...  :icon_cool:
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 29, 2007, 02:11:14 AM
Quote from: R.G. on March 28, 2007, 03:22:27 PM
Yes - it IS the same thing as I found in the 'magic' inductor. It's done by sticking a magnet onto the core, but it is the same effect. It causes the core to be closer to the edge of its magnetic linear range in one direction than another.

Maybe that's why the Fulltone inductor didn't quite like the magnet. (or i didn't like the sound...)
It is said that Mike Fuller made them using the 'same' materials as the originals,
so the core must have already been "slightly magnetised". It sounds awesome anyway!...

That Yellow Fasel produced the most clearly audible difference, so i stuck with it.
I believe i could find some more useful sounds if i experiment more with the other inductors.
Anyway, there are 5 more polepieces in that pickup and 3 more inductors in my Wah...   :icon_wink:

Quote from: R.G. on March 28, 2007, 03:22:27 PM
What's really clever is finding out that a fender pole piece is enough. That's sweet.

Yes, the guy who originally experimented with the jazzmaster polepiece was inspired!
I just followed his idea and used a ...Strat polepiece.  :icon_mrgreen:
btw, it is from a 1990 Am.Std. Strat. Very easy to remove, very easy to re-install.
(just mark one side, so in case of putting it back there won't be any polarity mis-match issues)
Don't try it with vintage style pickups, unless they are Very Dead.   :o

Quote from: R.G. on March 28, 2007, 03:22:27 PM
Anybody want to bet on how long it takes Dunlop to put out a "Magic Magnet" version?

Hehe... how about dead Fender pickups showing up on ebay?... 

Get them while you can....   :icon_mrgreen:
Title: Re: Magnetic offset on Wah Inductors.
Post by: manson on March 29, 2007, 08:40:27 AM
I just installed a Halo type inductor in my wah yesterday. Can you give it a try on yours too? Nice trick!
Title: Re: Magnetic offset on Wah Inductors.
Post by: enigmur on March 29, 2007, 05:30:21 PM
How strong does the magnet have to be? Assuming you dont HAVE to use a Fender pickup pole...

I had a go today with a fridge magnet and had no difference in sound, possibly it was too weak?
Title: Re: Magnetic offset on Wah Inductors.
Post by: Paul Marossy on March 29, 2007, 10:25:33 PM
QuoteI had a go today with a fridge magnet and had no difference in sound, possibly it was too weak?

Yep, that's much too weak to do anything that you can actually hear.
Title: Re: Magnetic offset on Wah Inductors.
Post by: enigmur on March 30, 2007, 12:39:12 AM
Cool ill swipe a magnet from out of a hard drive from work :D
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 30, 2007, 02:53:27 AM
Quote from: enigmur on March 29, 2007, 05:30:21 PM
How strong does the magnet have to be? Assuming you dont HAVE to use a Fender pickup pole...

A typical Fender polepiece (Alnico V) has a magnetic capacity of about 20-25 Gauss.

Mine being a 1990's model should have undergone a slight de-gaussing, so do the math...

Title: Re: Magnetic offset on Wah Inductors.
Post by: manson on March 30, 2007, 05:14:49 AM
I tried it on my wah, but didn't like it with the Halo. The effect was very audible indeed. I had a small piece of magnet and stuck that on top and later to the side. The sound changed with every angle i tried, even to a sort of Donald Duck like wah! Funny but not very useable. Maybe there's a sweet spot I didn't find yet, or it just works best with Fasels.
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 30, 2007, 06:06:51 AM
Quote from: manson on March 30, 2007, 05:14:49 AM
I tried it on my wah, but didn't like it with the Halo.
Maybe there's a sweet spot I didn't find yet, or it just works best with Fasels.

I didn't like it so much with any halo type (Fulltone, Banzai) inductor, either.

Maybe it's the ferrous core of that type that has already got some magnetic properties, so adding an external interference is not that good.
It might also require a more careful experimentation on finding the "sweet spot", as you said...

I want to try it in mine some day.

But it surely suits the Fasel.
Title: Re: Magnetic offset on Wah Inductors.
Post by: GFR on March 30, 2007, 08:38:22 AM
There's a mod at Pisotones where they use "anuncios flexibles magnéticos de TelePizza" :)

http://pisotones.com/Tri-Wah/Wah.htm

Scroll down to "Modificando el Inductor"

here's another inductor mod:

http://www.pisotones.com/Articulos/CrybabyMOD/Totufo/ModInduct.htm
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on March 30, 2007, 09:39:09 AM
Quote from: GFR on March 30, 2007, 08:38:22 AM
There's a mod at Pisotones where they use "anuncios flexibles magnéticos de TelePizza" :)

http://pisotones.com/Tri-Wah/Wah.htm

Scroll down to "Modificando el Inductor"

here's another inductor mod:

http://www.pisotones.com/Articulos/CrybabyMOD/Totufo/ModInduct.htm

cool, but i have to use the auto-translate for that page...   :icon_frown:
Title: Re: Magnetic offset on Wah Inductors.
Post by: momo on April 06, 2007, 11:29:36 AM
I just tried one of these computer hard drive body magnets, they are a bit strong for the size, but this one is a keeper! the voicing is more prominent and defined but still manageble level wise.
here is a picture...
(http://i150.photobucket.com/albums/s114/momoo_bucket/PICT5145.jpg)
Title: Re: Magnetic offset on Wah Inductors.
Post by: Paul Marossy on April 06, 2007, 11:31:13 AM
That hard drive magnet idea is pretty cool, too!  :icon_cool:
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on April 10, 2007, 02:30:11 AM
That surely sounds interesting...

and it sounded good on the Halo-type?

i have some HDDs i could "borrow" the magnets from...

:icon_cool:
Title: Re: Magnetic offset on Wah Inductors.
Post by: jonathan perez on April 10, 2007, 02:38:09 AM
my mom is a master crafter...

shes got magets!

going to raid her fridge tomorrow, then find magnets...

then eat more...
Title: Re: Magnetic offset on Wah Inductors.
Post by: momo on April 10, 2007, 10:05:49 AM
I have not tried the pole pieces so I cant compare, but im sure that the hard drive magnet is stronger than the pup poles. I had tried with a lid magnet and that was too strong, it reacted like a huge treble booster, the sound was good for a booster but that was it. So this hard drive magnet works great, you get more defined and a bit more pronounced voicing but still managble as a wha. This will be my setup from now on!

Note: the magnet is strong enough to stay put on the side of the inductor without falling. I tried different places on the inductor and it made no difference in the sound.
Title: Re: Magnetic offset on Wah Inductors.
Post by: alderbody on April 11, 2007, 02:15:19 AM
great find momo!

i'll try it in my "resonance" pedal which is parked wah config, which i use as a soft treble booster.

I believe, if i stick a stronger than a pickup magnet on that inductor, i'll move it closer to what i use it for...


btw, the magnet on my Fasel is definitely a keeper, and yes the magnets attach on halo type inductors and they don't need any mounting.