[sdiy] TB303 Slide

[Brian Castro]

Tim is right on, I've done a lot of testing w/ this myself.

Sent from my iPhone

On May 25, 2012, at 5:23 PM, "Tim Stinchcombe" <tim102 at timstinchcombe.co.uk 
 > wrote:

>> Does the R2R DAC in the TB 303 feeding the glide capacitor directly
>> actually achieve constant glide time regardless of the voltage span
>> between notes. (ie: glide time from 1V to 1.83V is the same
>> as from 1V
>> to 2V?)
>
> Yes. The output resistance of the DAC is always 100k, regardless of  
> the
> voltage, and so the time constant with the 220n (C35) is 22ms - thus  
> after
> about 60ms the slide is complete, no matter how large or small the  
> voltage
> change was.
>
> I have spent quite a lot of time looking into this myself recently,
> including scouring the archives - there is lots of interesting stuff  
> in
> there about how all this works: the timing of the slide signal, and  
> that the
> slide is active for a short pulse on *every* note in order to load  
> the 4174,
> but of course stays high for those for which 'proper' slide _is_  
> required!
>
> Tim
> __________________________________________________________
> Tim Stinchcombe
>
> Cheltenham, Glos, UK
> email: tim102 at timstinchcombe.co.uk
> www.timstinchcombe.co.uk
>
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