[sdiy] use for CA3140

[BrightBoy]

>As I sorted through my OpAmps I found a CA3140. A quick look into the
>Datasheet showed, that this is no "general purpose" OpAmp. Is there any
>special synth-related use for it? Pointings to schemos appreciated.

I you have a number of them, you could copy the Roland System 700 
filter modules:

http://fa.utfs.org/diy/roland700/

I seem to remember reading that the CA3140's are VERY prone to static
damage so be carefull with them....

Jeff