Clipping Diode Control

[Khas Evets]

I just read Jack Orman's Warp article ( http://www.muzique.com/lab/warp.htm ) that is worth checking out. I went through each one and tried to plot the effect each warp control would have on a sine wave, too bad that isn't part of the article.

There seems to be two common rules relating to resistors and diodes in series that I want to verify with the experts here. For my examples I'm using a clipping diode configuration following the opamp between the output signal and ground (as in Jack's article).

Rule 1) A resistor before a diode increases the diode's clipping threashold, similar to adding another diode.

Rule 2) A resistor after a diode alter's the 'shape' of the clipped signal. In other words, the resistor limits the diode's output thus softening the clip.

Is this correct, or does the resistor perform the same shaping effect before or after the diode?

[ragtime8922]

Khas, I wish I had a scope right now. This is very cool research. I loved that warp article as well as the saturation control article and, well, every article on AMZ. (The CD is very near the top of my "buy now" list).
     
      I'd be curious to see the results of your reseacrh. Are you using schottkey (sp?), Ge and Si? Please post if you can.

[Khas Evets]

I'm not that advanced. I was just trying to understand the relationship of the resistor/diode combination and how the warp circuits would sound.

The more I think about it, I think it doesn't matter weather the resistor is before or after the diode because once the diode reaches it's threashold and allows current through, the resistor would act the same way on either side. Am I on the right track?

[brett]

I think it doesn't matter weather the resistor is before or after

That's it.  

[puretube]

I might be wrong, but IIRC, Mark Hammer had a somewhat different
opinion on that in a thread a little while ago... ( :?: )


EDIT: sorry, it was R.G., who`s post I had in mind:

http://diystompboxes.com/sboxforum/viewtopic.php?t=21294

(not sure if it answers your "before/after" quest, though...)