AW: spikes (was:AW: FETs on the ASM-1 VCO.)

[Magnus Danielson]

>>>>> "HJ" == Haible Juergen <Juergen.Haible at nbgm.siemens.de> writes:

 >> I'm not familiar with this - what does the variable shape function
 HJ> of the
 >> vcs3 do, and how ?

 HJ> It's very simple: It's an ordinary one-transistor saw to triangle
 HJ> converter, and there is a variable DC offset voltage that
 HJ> will vary the point where the slope "folds over".
 HJ> If you don't have perfect symmetry, there will always be 
 HJ> a "jump" in the waveform. 
 HJ> In theory one might think this is pretty useless, but it will
 HJ> produce certain "trademark VCS3" modulations that
 HJ> are very pleasant. You can hear it on the noise sound
 HJ> at the beginning of this sample from my web site, for
 HJ> example:

 HJ> http://www.synthfool.com/diy/hj_adl4_turi.mp3

 HJ> There is some filtered white noise, and the filter is
 HJ> modulated with such an assymmetric triangle.
 HJ> Once you know where this effect comes from, you might
 HJ> recognize it on other recordings that use a VCS3, too.

 HJ> JH.

 HJ> PS.: Magnus, that might be an interesting addition for
 HJ> you know what, too !

Hmm.. this is certainly something that I need to test myself... but it
surely sounds promessing.

Thanks for the hint!

Cheers,
Magnus