If you have Adobe Acrobat Reader, click on the resources link above. There are thousands of radio schematics from the 1920s to the early 1950s. (Some of the A.H. Grebe schematics go back to 1919.)
If you don't have Adobe Acrobat, go to www.adobe.com and click on the "Get Adobe Reader" button.
:Can you send me some radio control circuits