[Transistor tester]

hi
i read out ur very good suggestions.iam also working o this project
i want to have some more details of this project(theory)
that what is happening internaly and what the way it works ?
on what conditions the flip flop turns how diodes behave etc
so any links ....or message..
i will be very much grate full to all of you people
and this is a grate site
keep it up