interesting VCO was RE: [sdiy] Imperfect VCO

[Czech Martin]

Hi Ian,

did you have a look at the VCO schematic of the (Fairchild?)
74HC4046 in the data sheet? 

This could be done with discrete components also.

Maybe this could be turned into a tri output.
Maybe also phase reversal is possible.

m.c.

-----Original Message-----
From: Ian Fritz [mailto:ijfritz at earthlink.net]
Sent: Freitag, 1. August 2003 18:06
To: Czech Martin; music.maker at gte.net; synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] Imperfect VCO


At 04:36 AM 8/1/2003, Czech Martin wrote:

>I have the impression that simple circuits like diode clippers
>give only minor effects, and the more interesting effects
>like "folding" , "resonance" need considerable circuit effort.
>
>There is no free lunch.
>
>So on the bottom line: wave mangling is interesting, but you should
>not expect wonders from simple circuits.


Agreed.  I looked at simple circuits many years ago and didn't find 
anything very exciting.  That's why my waveshapers have generally been 
getting more and more complicated.  The double-pulse generator, the 
5Pulser, the Wavolver ... these are the interesting ones.  I also have on 
paper a SNIC-based folder, similar to the Buchla except the folded peaks 
evolve into sawteeth rather than smooth peaks.  This one will really pump 
out the harmonics.

   Ian