4046 VCO experiment

[theinmans at mindspring.com]

Scott Gravenhorst wrote:
> 
> The 566 can probably work with an external V/I converter.  

See Thomas Henry's "Build a Tunable Noise Generator" in the Nov. 
99 (vol. 20, no. 11) Nuts and Volts (pages 25-27).  It uses the 566 
as a tunable noise source, but also shows how the chip can be used
to get a 20 Hz to 20Khz range by using a John Simonton trick 
first described in Polyphony, Nov. 77, p.28-31.  I would love to 
see a copy of that article.  The N&V article also shows Terry Mikulic's 
exponential converter from Electronotes (v. 5, No. 37, p. 2-4).  

I really like the 566.  I think it makes a very sweet triangle wave
and a pleasantly buzzy square wave.  

Thomas Henry says to check his website for more, but I haven't seen
anything about this circuit.  I gather he has been very, very busy.
The new web site does look A+, though:  http://mall.lakes.com/~map


Elliot