[sdiy] Sawtooth vs. Triangle core VCOs

[Richard Atkinson]

I'm very curious to know what approach the Moog Sub Phatty is using. In 
the video for Sonic State where Amos demonstrates the Sub Phatty sounds 
on an oscilloscope, he comments particularly on the purity of the Sub 
Phatty's triangle wave. Certainly there's no obvious glitch at either 
the top inflection point or the bottom, where a sawtooth wave that had 
been waveshaped simply into a triangle wave would have one.

http://www.youtube.com/watch?v=qYfhIMAwjVM


On 2013-01-25 0:33, Ian Fritz wrote:
> With modern designs using modern components either Saw or Tri can
> reset cleanly within 200 ns.
> http://home.comcast.net/~ijfritz/sy_cir4.htm
> http://www.electro-music.com/forum/topic-28713.html
> There is very small correction for switching time in either case.
> You will find that many people here are stuck inthe 1970s and don't
> understand what is possible today.
>
> I prefer the Saw-core approach, because it is simpler.  And my Teezer
> thru-zero module shows that a Saw-core can be used for the thru-zero
> application also.
>
> One consideration arises if you need to use your VCO in LFO
> territory. The unavoidable switching transients could be an issue in
> this case.  I would suggest choosing your VCO design to take this 
> into
> account.
>
> Just one ole  po-boy's opinion, FWIW.  (Not much, generally 
> speaking.)
>
> Ian
>
>
>
>
>>On 1/24/13 3:09 PM, Paul McLean wrote:
>>>I've been wondering about the pros and cons of these two approaches.
>>>
>>>Would folks be willing to comment and the advantages and 
>>> disadvantages of both?
>>>
>>>Thanks,
>>>Paul McLean
>>>San Jose, CA, USA
>
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