I wrote this document to explain the use of standard diodes in varicap mode -
Much of what is here was posted on the
"Capacitance from diodes" thread on Theremin world.
http://www.thereminworld.com/forum.asp?cmd=p&T=4223&F=3
and the preceding thread Waveshape,Timbre,etc:
http://www.thereminworld.com/forum.asp?cmd=p&T=4206&F=3
This document details the principle, shows some test results, presents schematics, gives circuit for thermal compensation -
Everything needed to use diodes as voltage controlled capacitors.
