555 circuit

[theinmans at mindspring.com]

> simple synth...
> and the heart could
> be that 555...

See Tom G's:

http://www.xavax.com/efm/synth/cbook/pics/vco555a_sd.gif

Also, for a great general lesson on the 555, see Howard 
Berlin's "555 Timer Applications Sourcebook, with Experiments" 
(ISBN 0-672-21538-1).  The book is out of print, but will 
probably be at a good university library or a really good
public library.

Elliot