[RE: [Re: [Re: multistage rate level env generators]]]

[M.Ruberto]

Steve,

this gives me an excellent idea. the pots that set the level don't just have
to be dividers supplied by the fixed + supply rail, they can take their input
from an external CV. then you can do really fun stuff like plug in a LFO or
other envelope and have it "transmogrified" by the multi stage. this could be
very interesting!

-<mike>-

btw: status of project: waiting for Mouser shipment.

"Curtin, Steven D (Steven)" <sdcurtin at lucent.com> wrote:
> Mike and Grant,
> 
> > last night i tested my idea for the window comparator. the test circuit
> > was
> > very simple. i used a 1458 dual op-amp with both outputs ORed together
> > with
> > diodes. amp1's - input was connected to the wiper of a pot connected
> > between
> > the 12v and ground rails. amp2's + input was connected through a diode to
> > amp1's - input. amp1's + input was connected to amp2's - input which was
> > connected to the ouput of an env generator module. in this setup the
> > comparator's output is active low. the window was .25 volts. as i
> > triggered
> > the envelope the comparator changed states on both upward and downward
> > transients with nice short pulses. for my design this is perfectly
> > acceptable
> > behavior.
> > 
> Very cool.  This gets me thinking - Some form of this circuit might be
> applied to build another module from the Xpander I keep hoping someone will
> implement in discrete form, and that is the "tracking generator".   This
was
> basically a piecewise linear interpolator where you could set the height of
> the curve and a very few points and the interpolator would fill in the
rest.
> If you put a ramp in the input you get a multi-stage envelope, but it's
> useful for all sorts of things.  It seems like Juergen's crossfader in
> modified form could be used to do this, maybe use the outputs of the
> crossfader to control VCAs that have as their signal inputs the
"endpoints".
> 
> Steve C
> 
> -----------------------------------------------------------------
> Steven Curtin  
> Lucent Technologies Microelectronics
> ph: (732)949-4404   fax: (732)949-6711
> http://curtin.emf.org
> sdcurtin at lucent.com
> -----------------------------------------------------------------
> 
> 


____________________________________________________________________
Get free email and a permanent address at http://www.netaddress.com/?N=1