MOSFETS as clippers

[YouAre]

I haven't seen much talk about anyone using mosfet transistors as clipping diodes. I've seen the layout for using an MPF102 as a clipper in the boss sd-1. But can anyone tell me the layout for other transistors and the results? Anyone have any idea whats in the fulltone OCD/mosfet edition of the fdII?
thanks,
~Murad

[petemoore]

  Mosfet as clipping element, I think there's something in Faq about it, also have a look in schematics...IIRC it's the Insanity Box or...one of Aron's schemtatics shows some mosfet clipping element configuration.

[zyxwyvu]

There's some info on MOSFET clipping here:

http://www.muzique.com/lab/zenmos.htm

[JHS]

If you want to know how different diodes, FETs or Mosfets sound in a given circuit there's only one way to find out: put 'em in and listen how the FX sound afterwards.

Even if you use 2 1N914 for a clipper and replace them with 2 other 1N914 (for ex. in a TS) the tone can be quite different 'cos it's hard to fetch 2 diodes out of a lot that have the same conductance voltage (5-15% difference is normal).

For a total sym. clipper the conductance voltage of any diode must be analysed and then 2 diodes with equal voltage must paired. If you don't match them the clipper often is slightly asym. , producing a harder and more trebly tone compared to a total sym. clipper.

JHS

[aron]

John Greene was one of the first to use this. I used a variation (not the same) in the Shaka Braddah III. In addition, I do talk FETs and other clipping diodes in the simple mods page off of the Wiki.

http://www.diystompboxes.com/wiki/index.php?title=Simplemods#Simple.2C_Easy_Mods.2FTips_.26_Techniques

Shaka Braddah III

http://www.diystompboxes.com/pedals/shaka3.jpg

Plus, try the search function too.

[WGTP]

http://www.elixant.com/~stompbox/smfforum/index.php?topic=38581.0

If your sure you want to know.   

[lovric]

There's some info on MOSFET clipping here:

http://www.muzique.com/lab/zenmos.htm

AMZ is updated. i haven't been there for sometime but there's also interesting links from that page on.

[YouAre]

reading these links....and the links i found in those links......

in arons wikipedia style page, and from other articles, for FETs, the gate/source connected form the anode, and the drain is the cathode....am i right?