Yamaha DTXpress/DTXplorer/DTXtreme

--- In DTXpress@yahoogroups.com, "emf" <liberatusvirus@y...> wrote:
> --- In DTXpress@yahoogroups.com, "Keith" <keith@k...> wrote:
> > I am planning to design and build the "magic box"  but I seem to
> > remember a post around the same time as this one that gave the 
> maximum
> > time between the rinm switch closing and the piezo triggering (or 
> vice
> > versa) to get the required sound from the rim.  I have searched the
> > archives but cannot find it again.  Does anyone know the answer.  It
> > is important because if the rim switch needs to be closed before the
> > piezo triggers I will need to add a small delay in the "rim" piezo
> > signal because I will not be able to close the rim switch signal
> > before the piezo has been hit.
> 
> Within the limits of possible measurements on our scale, the two 
> events are simultaneous, or as OGD put it, "The piezo and the rim 
> switch have to be triggered within micro-seconds of each other or the 
> rim will not trigger the sound assigned to it." OGD's experiment 
> permitted no perceptible lag time.
> 
> Ed

Thanks, I thought someone had actually measured it, but it may have
just been a subjective "microseconds" I remember.  I will have to
experiment or get the oscilloscope and signal generator moved into the
drum room and measure it.  I suspect I will need to close the switch
just before the piezo which means I will need to delay the piezo
signal slightly from the pad being used as a rim input.  One strange
thing I noticed is that if you hold the rim switch closed it ignores it!

Keith.