SV: [sdiy] How about some SDIY?

[Harry Bissell Jr]

I tried a quick spice simulation of Aaron's
idea and it 'sort of' works. For the most part
it generates a triangle wave... and it becomes
sawtooth only at extremes of CV setting. The change in
frequency is really extreme, and it cannot get a very
fast rising
or falling ramp.

H^) harry

--- karl dalen <dalenkarl at yahoo.se> wrote:

> Thtas a Moog source enveloop generator or a voltage
> controlled
> funktion generator.
> 
> The only smooth transformer im avare of are Ian's!
> 
> I have some vague memories of the relationship 
> between frequency of the PW and scaling current
> beeing quite difficult over the entire VCO 
> frequency range making your solution difficult to
> use!
> 
> KD
> 
> --- Aaron Bader <sparked at zadzmo.org> skrev:
> 
> > 
> > I'm going to give this a shot on the breadboard
> tonight - the idea is
> > basically PWM for triangle/sawtooth waves, ie,
> smoothly morph from saw
> > to tri to inverse saw by way of voltage control.
> > 
> > It's simple enough that I assume it's been done
> before. Any
> > tips/disadvantages to this approach?
> > 
> > -- 
> > 
> > "Not a bird not a leaf not a sound/And well after
> the close of time" 
> > 	--Front 242
> > 
> > Public Key: http://sparked.zadzmo.org/
> > 
> > 
> 
>