[sdiy] Ray Wilson's MFOS Quantizer PCB

[thomas white]

Ray has a new module up. It is a simplified quantizer
available as a PCB for $17 US. Check it out at his
website:

http://www.musicfromouterspace.com/analogsynth/VOLTAGEQUANTIZER/VOLTAGEQUANTIZER.php

Here are some details:

MFOS Voltage Quantizer (+/-12V to +/-15V)
Article by Ray Wilson
Back to "Music From Outer Space" Analog Synth Pages

Features

    * Converts continuous voltage input to discrete
.0833 voltage steps.
    * Also provides whole step and fourths mode
(.1666V and .3332V steps).
    * Low cost parts used in the A/D and D/A circuits.
    * Adds 12 tone (or whole or fourth tone) musical
dimension to S&H outputs.
    * Eases sequencer set up by correcting notes to
discrete steps.
    * Conversion time varies from sub millisecond to
1.26 millisecond (full count)
    * This thing is pretty darn fun! 

Possible Quirks

    * Never let it be said that you won't find a
voltage that causes inter-count jitter.
    * Minimal chatter on step change with slowly
changing input voltage. 

Introduction
A voltage quantizer takes a continuously variable
input voltage and outputs a stepped (or quantized)
voltage. Whereas the input voltage might ramp up from
0 to 1V continuously the output voltage of the
quantizer will be discrete steps of .083V. In normal
mode this quantizer always starts at digital 1 or
.083V. As the input voltage starts to ramp from 0 up
to 1 volt the output will step to .1666V, .2499,
.3332, etc up to 1.0V. The circuit also features a
whole step mode in which the in to out conversion is
quantizd to steps of .1666V. It also features a fourth
step mode in which the in to out conversion is
quantizd to steps of .3332V. Useful with sample and
hold circuits to bring voltages into musical scale
steps (half, whole or fourths). Useful with sequencers
to bring voltages into musical scale steps (half,
whole or fourths). 

Thomas White
  Natural Rhythm
www.naturalrhythmmusic.com