PLAN B analog blog

--- In PLAN_B_analog_blog@yahoogroups.com, "(i think you can figure 
that out)" <peter@...> wrote:

> I have uploaded a file of the baeic patch which will give you this 
sound.  Go to Photos, 
> then to Miscellanous - it's the last one there.  You're probabably 
not setting the Model 13 
> withc to the center poition - this is critical to this sound.

Thank you. I think my patch was similar. I have to check.

 
> > At the same time I would like to comment something, I don't like 
in M15:
> > Pulse and saw waveforms are in such phase relationship, that 
phase 
> > cancellation occurs in mix. The sound is less full and somehow 
> > artifical IMHO.
> 
> The M15 Saw and Square are phase aligned  - WHEN THE PWM IS SET TO 
50% DUTY CYCLE, 
> I know this to be true based on the way I generate the sawtooth 
waveform from di-secting 
> the triangle wave through an analog switching using the reset pulse 
form the VCO core.
> 
> And although that core produces a square wave (the reset), I don't 
use it for the square out 
> - I also use the triangle to create the PWM.  In that both are 
dirived from the same triangle 
> output, they are always going to be in phase relationship when the 
duty cycle is set to 
> 50%.

It is too difficult for me to explain in english, what I mean, but 
for those interested, here is a picture.
http://www.esnips.com/doc/c4e865f9-5d54-4ab7-a513-
9619369da4b4/saw+square
(Cwejman clip is reversed for easier comparison.) At first glance one 
might assume, that there is 25% duty cycle in the middle (M15) clip. 
It is 50%.

In this case, I prefer the fuller sound of Cwejman - except that the 
saw/pulse mix ratio can't be changed.


A random comment: Someone didn't like the small range of M15 Fine 
Freq control - I like it, as it gives much precision.


Best regards
Jari Jokinen