[sdiy] They aren't sawtooths, they're ramps

[Dave Manley]

Donald Tillman wrote:

>    > I think there's some 'prior art' that may conflict with your definition. 
>    > Didn't the original Moog modular oscillators and first gen minimoogs use 
>    > a unijunction transistor in the oscillator core?  I think a buffered 
>    > version of that is the sawtooth.
> 
> Lots of older VCO's used unijunctions to reset the waveform.  That's
> okay, they work like schmitt triggers.
> 

My recall was faulty, in that the unijunction transistor is not used in 
the Mini, but is used in the 901B.  In the later it is used, as Don 
says, to reset the waveform.  Here's a link for those interested:

http://www.hylander.com/images/schematics/901b.jpg

-Dave