[sdiy] Simple DIY Project

[Scott Gravenhorst]

Sorry, I deleted the original email before I realized I had
a suggestion.

Assuming you want an exponential VCO project, go to:

http://www.uni-bonn.de/~uzs159/vco4069.html

This is a great little VCO by René Schmitz.  He has a nice page
with "how it works" info, the layout and schematic.  I built and
regularly use a linear version of this.  The VCO's simplicity is
deceptive; it has a suprisingly large accurate range.  My
stripboard version runs 9 octaves.

It gives you sawtooth and pulse width modulated outputs (the PWM
can be set to give square).  It uses 1 IC (cheap) and 3
transistors.  Lots of functionality for peanuts.

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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