[sdiy] New Waveform Animator Module

[Ian Fritz]

Scott --

I did a similar project back in the "old days".  My version has six stages, 
like Bernie's.  The six LFOs are totally independent, voltage controlled, 
with sync inputs and tri, square and trigger-pulse outputs. The LFO bank 
also has built-in output attenuators and mixers.  I made them this fancy so 
they could be used in other applications.  The animator itself has saw to 
tri converters on each stage, just like yours.  The final output has two 
ganged switches.  The first of these switches stages 1-4 between saw and 
tri and the second switches stages 5 and 6.  In other words, you can have 6 
saw's, 4 saw's + 2tri's, ... etc.  The animator also has variable drive on 
each modulation input, an output mixer and a depth control.  To me, the 
overall effect is similar to chorusing.

"Obesifier" -- I like that.

   Ian


At 10:02 PM 8/1/2003, Scott Bernardi wrote:
>Interesting that the subject of waveform animation came up; I just 
>finished a new waveform animator module - I call it the Obesifier because 
>it makes your synth sound Real Phat!
>OK, I apologize for the corny name.  This is an enhancement to the 
>original Multi Phase Waveform Animator (MPWA) based on an Electronotes 
>circuit.  It takes a saw, tri, or sine input, and has 8 independent tri 
>LFO's that perform a "symmetricised  ramp modulation" (kind of like PWM 
>for sawtooth waveforms) and sums the outputs. Six of the on board LFO's 
>are fixed frequency, and two are frequency adjustable. Also one of the 
>adjustable LFO's can be overridden with an external VCO.  The adjustable 
>LFO outputs are brought out to panel jacks with level controls so they can 
>be used elsewhere.
>The result of the 8 stages of modulation gives a lush, ever changing 
>pattern that sound phatter than 3 beating VCO's, but only takes one VCO to 
>drive it.  Really great for drones. Plus the waveforms look really cool on 
>a scope.
>There are two types of outputs: animated "saw" (actually it's just a saw 
>if you drive the input with a saw), and animated triangle.  The animated 
>triangle takes each of the modulated saw output from each stage, runs them 
>thru a saw to triangle converter, and sums the outputs. Looks like a 
>piecewise linear waveform where the segment endpoints are constantly 
>changing. It has a mellower sound than the animated saw output.
>I should get some sound samples up next week, but schematics are posted now.
>http://home.comcast.net/~sbernardi/elec/og2/og3_obesifier.html
>
>--
>Scott Bernardi
>sbernardi at comcast.net
>
>