[sdiy] Aztec MkII Almost Complete

[Michael Ruberto]

I forgot to mention the best part. The amplitude of the steps can be varied 
from a linear to a logarithmic response. Lots of harmonic variety there!

M. A. Ruberto

>From: "Michael Ruberto" <frankentron at hotmail.com>
>To: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] Aztec MkII Almost Complete
>Date: Tue, 31 Oct 2006 21:36:53 -0500
>
>For those still interested in this waveshaping device I have good news. I 
>have been working on the prototype of the MkII and so far it's a success. I 
>have the core circuit up and running with all the new changes. Here is a 
>synopsis of the new circuit:
>
>Bit depth increased from 5 bits to 20 bits.
>Continuously variable from 1-20 bits.
>New control to vary the "pulsewidth" of output waveform (works on saw, tri, 
>sine etc).
>Decreased parts count.
>Operating current reduced significantly.
>Greatly reduced power supply interference.
>VCA not needed - the 3080 is gone.
>
>
>If you aren't familiar with the Aztec Processor here's a short description.
>
>The waveshaper works on the concept of a variable bit depth A/D > D/A 
>converter. The converter has no sampling clock. The signal is derived from 
>a resistive D/A converter tied directly to the output of an A/D converter 
>with a linear amplitude output instead of a binary representation output. 
>The device uses LM3914 bargraph display drivers for it's core. Feeding in a 
>triangle wave results in a stepped ziggurat shaped output. The bit depth 
>alters the number of steps in the shape all the way down to a basic square 
>wave. Each step creates a new harmonic set not in the original wave.
>The Aztec is designed to work with both audio rate signals and CV signals 
>of any kind within a 0-10V range.
>
>Now I have some glue circuitry to design. Schematic will be posted soon..
>
>M. A. Ruberto
>
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