Here is my version of the Flux Capacitor drawing done by Doc Brown in Back to the Future. I feel this is the most accurate version of the drawing without having access to the original drawing. I have interpreted this version from viewing many stills from the DVD and Blu-Ray copies of the movie.
Free download available at http://amfxcreations.ecwid.com/
Free download available at http://amfxcreations.ecwid.com/