Lots of circuit diagrams for almost everything here !!

[beam me up schottky]

This site has a truly staggering quantity of circuit diagrams for almost everything imaginable !! Some even have circuit board layouts to copy.

I have surfed through quite a few and have found some are dead links but there are so many it's still amazingly interesting !

http://www.satsleuth.com/schematics.htm

[tiv48]

added to fav

[Shaman]

What a collection of circuits, added to favs, thanks....Alan.

[Pamphonica]

A very useful resource. Some links inevitably don't exist any more but a great repository of good ideas...
...Jeremy