anyone have a good mosfet overdrive schematic?

[jamiefbolton]

So far i've built a one knob JFET booster and a TS with an opamp. I'm looking for a nice MOSFET overdrive. Not a one knob booster though. I've got an array of parts including some BS170s (i think thats right). Anyway, are there any good MOSFET ODs out there. Ya know, kinda simple. I'm still a novice.

Thanks
Jamie

[jamiefbolton]

anybody?
or can you guys help me mod an eternity clone using mosfets?

[PenPen]

The Matchless from Runoffgroove is a decent one, as is the Meteor that it's based on.

http://www.runoffgroove.com/articles.html

[jamiefbolton]

yeah i've forgotten about ROG. many good things there

[jimbeaux]

Another possibility is the AMZ Mosfet Booster (PC Board is Available)

http://www.muzique.com/schem/mosfet.htm

- Jimbeaux

[jamiefbolton]

how much gain is available for the AMZ mosfet.

(i have the minibooster which has lots of gain. looking at a BSIAB2 as well.)

[Toney]

ROG Peppermill.
1 BS170 and a J201.
Absolute killer 'tone preserving' OD.

[jamiefbolton]

sweet. thanks for the replies. i've got some stuff to work with now.

[Ripdivot]

Jake Nagy Blue Magic
1 BS170 and a J201.
Absolute killer 'tone preserving' OD

[WGTP]

http://www.aronnelson.com/gallery/main.php/v/WGTP/Mosfet_Incenerator.jpg.html?g2_imageViewsIndex=1

How about 4 different ways to build a Mosfet stage, or combine 3 of them.

Or the Obsidian: http://www.diystompboxes.com/analogalchemy/sch/obsidian.html  

[Toney]

Jake Nagy Blue Magic
1 BS170 and a J201.
Absolute killer 'tone preserving' OD

Wise-guy of the cut and paste, I though  but...
Yep, they are awfully similar. I have never noticed that before.
Schems here...

http://runoffgroove.com/peppermill.html

http://www.generalguitargadgets.com/diagrams/bmagic.pdf

The Peppermill almost looks like a 'lite' Blue Magic but no doubt the guys at ROG developed it themselves.
I have build only the Peppermill and I must say, I love it!

Doubt you could go wrong with either.

[Renegadrian]

Else you can clone Fulltone MOSFET Fulldrive. Nothing new, but hey it seems to work good...

[m-theory]

I've built both the peppermill and the blue magic, and both are great OD circuits, though I find them both to have their issues.  The peppermill is barely an overdrive at all.  A fat booster has considerably more gain on tap.  Great sounding circuit and very transparent/organic, but not much in terms of dirt.  It makes a really nice boost, btw, and if you're just looking for mild gain, this is a terrific choice.

The Blue Magic was a bit of a disappointment to me.  The combination of rather high parts count and costly caps of odd values didn't add up to a circuit that sounded worth the effort, to my ears.  I really wanted to like this one, too, but it apparently just isn't for me. 

[Paul Marossy]

Blackstone Appliances MOSFET OD. It's recently been reverse engineered.

[ZombiCrow]

Whoa whoa! The Blackstone sounds great; where's the reverse-engineered info?

[The French connection]

Emma - Reezafratzitz

http://www.youtube.com/watch?v=cnmq92jXmp8

...been reversed too...Search.

Edit: For the OP...no bs170 in this one...more like a 4069 inverter i think...

[Paul Marossy]

Whoa whoa! The Blackstone sounds great; where's the reverse-engineered info?

PM me and I'll tell you where it is.

I just built mine, and I think it sounds great. I just have to figure out how to get rid of the popping when switching now.

[DougH]

as is the Meteor that it's based on.

That would be JFET.