[sdiy] TB303 Slide

[Tim Stinchcombe]

> 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