You can't post a PDF directly on PFF. You could put a PDF on another server and then link to it.
Better, though, is to scan your diagram(s) in GIF or JPG image format and then upload them to PFF using PIP. (See the bottom of the main menu page for a link to download and install PIP on your computer. With a little more effort, you can use FTP instead of PIP.) GIF is generally a better image format choice for line drawings (like electrical schematics), while JPG is usually better for photos.
P.S. This thread probably should have been started in the
TOT (Totally Off/Topic) GFC
(General Fiero Chat
[This message has been edited by Marvin McInnis (edited 08-26-2013).]