[sdiy] current question

[harrybissell at wowway.com]

well why didn't you say so...

JH has a Korg based oscillator that illustrates how to get
a sawtooth wave over many cycles by octave division and
waveshaping (in the 700 series documents, was it ???)

Once you get the sawtooth you can waveshape everything else, 
and no problems with two current sources, sync comes for free

H^) harry


On Thu, 26 Jul 2007 16:06:22 -0400, John Mahoney wrote
> At 03:04 PM 7/26/2007, harrybissell at wowway.com wrote:
> 
> >I'm imagining what you might be trying to do and can't think
> >of a real simple way
> 
> Yeah, I imagine that what I'm trying to do matters a great deal. :-) 
> OK. I was trying not to go there -- better to test one's possibly 
> dumb ideas in private! -- but my idea is this:
> 
> Can we make a "dual core" VCO? (To borrow a term from modern 
> microprocessors.) One core would behave normally, while the second 
> would run at half the rate of the first. The second core would be 
> hard synched to every other cycle of the first core so that it would 
> run at exactly half the rate. The goal is to produce a suboctave 
> output that's not a square wave.
> 
> Another way to put this is that the second core is a relaxation 
> oscillator that's reset by a square wave suboctave of the main core.
> 
> Heck, this doesn't even need a second current source, does it? The 
> second core can simply charge to twice the voltage of the primary core.
> 
> Is this as trivial as it seems to be?
> --
> john
> 
> -- 
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> 7/26/2007 9:56 AM


Harry Bissell & Nora Abdullah 4eva