Saw to Triangle problem!

[Tadej Bozicko]

Hello!

I have problems with my saw to triangle converter. On the positive peak I noticed some sort of clipping, but it's more like nonlinearity of the diodes. I've tryied several designs, but they are all the same. Same clipping at the top, since the negative peak is ok and is sharp as a needle :). Is that normal or what? This is especially noticeable at lower frequencies. Has anyone experianced and solved similar problem? I've already tryed several diodes (Ge, Si) and even BE diode in NPN transistor. No change :(. I think the problem is not in design (since it work ok in silmulator), it has to be something else. Note that I've also tryed several input amplitudes, but again no change in quality. So I hope someone has solution, because this clipping really bothers me a lot. The design is at:
http://imola.uni-mb.si/~bozicko/saw2tri.gif
Even tryed Korg MS20 saw to tri, and Formant saw to tri and they all do the same clipping. Maybe it should be that way? Btw. I am using soundcard as a scope, so maybe there lies a problem (but sawtooth has no clipping at all).

Tadej Bozicko
E-Mail   : tadej.bozicko at uni-mb.si
WWW  : http://imola.uni-mb.si/~bozicko
WWW2: http://www.uni-mb.si/~uelelt68b

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