Hello.
Our professor gave us a research work on how to design a preamplifier. I browsed some posts here that are of help. However, I still need a sample design circuit, parameters and things to be considered. I hope you can help this newbie here.Thanks a lot

 

google, "pre-amp schematic".

 

What kind of preamplifier?
A microphone preamplifier is very different to a tuned RF preamplifier,which is in turn,different to a wideband instrumentation preamplifier.