Below are the details, images and a sound file for the THEREMIN I have just built.
My source for the theremin schematic is the "Build the EM Theremin This classic electronic instrument gives good vibrations and excitations. By Robert Moog" from the publication "86 Electronic Musician February 1996". The article contains a schematic, parts lists, construction tips and tuning procedure.
Actual construction resulted in difference between the fritzing layout and actual build.