Passive Tone Control Project

[Brushthrower]

Hey,

I'm planning on building Craig Anderton's Passive Tone Control from his book "Electronic Projects for Musicians" but I can't seem to find the 4TM019 transformer locally. Does anyone know of a reasonable substitute? Here's the schematic:





Thanks!

[Mark Hammer]

If you can score one of those little green interstage transformers from Radio Shack, that'll work too.  This kind:

Use the green and blue leads.  You may find you want to fiddle with the cap values in the end, to situate the notch where you want it, but it'll work.

[MikeH]

Would a 4tm018 from small bear work for this?

[jimbeaux]

I'm almost sure that this one will work.

http://mouser.com/Search/ProductDetail.aspx?qs=LQJGOuQCHKQk%2faBX9yNCGw%3d%3d

-Jimbeaux

[Mark Hammer]

The key issue is the inductance, since the Anderton thing is simply an LCR resonant circuit.  The inductor should be in the 500mh to 1h range.

[smallbearelec]

I have the 42TM019...my SKU2610C. I am curious how that circuit sounds, so let us know how you like it.

SD

[aron]

Remember the FAQ?

Check out this thread I saved...

http://www.diystompboxes.com/smfforum/index.php?topic=51510.0

[Paul Marossy]

Hmm... intriguing little circuit. Are you planning on putting this in a guitar? I'm wondering how it might load the pickups.

I think I might breadboard this to see how it might sound in one of my guitars...

[aron]

Paul,

This is basically the varitone circuit like in the old Gibson guitars.

[Paul Marossy]

Paul,

This is basically the varitone circuit like in the old Gibson guitars.

Oh, that's good to know!

[aron]

Check this out:

http://www.diystompboxes.com/smfforum/index.php?topic=34864.0

[Paul Marossy]

Check this out:

http://www.diystompboxes.com/smfforum/index.php?topic=34864.0

More good info! Thanks, I learned some new stuff today. Never fails! 

[the recluse]

This was one of the first projects I built.  I was actually pretty surprised as how much of an effect something so simple can have.  In some settings it very much produces a %^&*ed way sound.

[Paul Marossy]

This was one of the first projects I built.  I was actually pretty surprised as how much of an effect something so simple can have.  In some settings it very much produces a %^&*ed way sound.

So... do you think it's useful as a guitar tone control?

[WGTP]

Also one of my first when the Anderton book came out.  It has some lose and you may need a gain stage with it, but cool circuit.  The notch filters we use hear are a variation that does not require an inductor. 

[Mark Hammer]

I stuck a Stratoblaster just ahead of mine and packaged the thing in one box.

Note that if you shunt the transformer/choke, you have a variable treble cut.  If you shunt the cap, you have a variable bass cut.  And if you shunt them both, you have a volume control.

One of these circuits, in tandem with a gain stage to make up the passive loss, and a 3-position toggle to select treble-cut, bass cut or notch, makes a very flexible tone tool.

[Paul Marossy]

I suspected that this tone control might need some kind of gain stage with it. I bet I could tweak the Tillman FET circuit a bit to use in conjunction with this "passive" tone control.

[Mark Hammer]

Well, the Tillman JFET stage and the Stratoblaster are siblings.

[Paul Marossy]

Well, the Tillman JFET stage and the Stratoblaster are siblings.

They are?! I never noticed that...

[Tubebass]

Wouldn't it be possible to put the inductor and cap in parallel to get a peak instead of a notch?