used to have a GIF of the mockingboard
schematics available on his site. you might want to see if you can contact him
and see if he still has the image.
Quoting "Richard A. Cini" <rcini at optonline.net>:
  I looked there originally but they don't seem to
offer the sound board
 at
 this point. They have a few parts, but that's it. No manuals or
 schematics
 that I can see, and no "support" link.
 On 5/9/07 7:50 AM, "Steven Hirsch" <snhirsch at gmail.com> wrote:
  On Tue, 8 May 2007, Richard A. Cini wrote:
> All:
>
>    I?ve done a bit of searching for this but can?t locate it. Does 
 anyone
 > have a scannable copy of the schematic for
the Mockingboard sound 
 board for
   the Apple
II? 
 The folks at GSE Reactive have revived the Mockingboard as a product.  
  One
  presumes they have the schematic available:
 
http://www.gse-reactive.com/
  
 Rich
 --
 Rich Cini
 Collector of Classic Computers
 Build Master and lead engineer, Altair32 Emulator
 
http://www.altair32.com
 http://highgate.comm.sfu.ca/~rcini/classiccmp