[sdiy] Sawtooth vs. Triangle core VCOs

[Paul Perry]

I have made many a sine by crushing a triangle - typically by overdriving a 
LM13700 or similar -
and looking at those scope shots on youtube, the moog ones there are 
definitely no better.
In fact they look rather misshapen compared to a mathematical sine.

. Nothing wrong with that, though - I am a firm believe that ears trump 
scopes
when it comes to subjective 'purity'. I have known very strange looking
pointy-headed sines that sounded perfectly OK.

paul perry melb australia


----- Original Message ----- 
From: "Richard Atkinson" <rga24 at cantab.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, January 25, 2013 12:10 PM
Subject: Re: [sdiy] Sawtooth vs. Triangle core VCOs


> 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
>