[sdiy] Dual oscillator cores?

[cheater cheater]

Ian,
thanks for this comparison.
To understand this fully: according to your comparison tri-core
oscillators do actually need as much correction as saw cores? I have
little experience with the different implementations of oscillators so
I wouldn't be able to talk in general like you are able to..

Thanks
Damian

On Mon, Oct 19, 2009 at 2:58 PM, Ian Fritz <ijfritz at comcast.net> wrote:
> At 06:36 AM 10/19/2009, Jerry Gray-Eskue wrote:
>
>> <<I'm not sure how triangle cores
>> switch the direction,>>
>>
>> Take a look at this, it is near to a classic Integrator / Comparator setup
>> and may help clear up how triangle cores operate.
>>
>> http://www.musicfromouterspace.com/analogsynth/NewAugustRampLFO.html
>
> A typical Tri VCO is current-controlled and uses transistor switches to
> reverse the input current direction.  My version uses analog switch ICs to
> do this (as well as to reverse the threshold voltage) and is quite fast.
> Compensation of the IC's capacitance according to the manufacturer's
> suggestion really helped with the speed. It switches in about 300 us,
> actually quite comparable to my best Saw cores.
>
> Ian
> http://home.comcast.net/~ijfritz/sy_cir4.htm
> http://www.electro-music.com/forum/topic-28713.html&postorder=asc
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>