Hi there i am a first year student studying electronics engineering in India.
the problem is that i have to build a simple circuit which will show the use of semiconductor physics in our lives. thus if i could get ideas for a simple circuit which would include a diode or a transistor and would be somewhat useful i think my problem would be solved . i was thinkin of an amplifier circuit but cannot decide whether i should go ahead with the idea because of limited knowledge .by the way my deadline happens to be september 30 so if i could get quick assistance i would appreciate it.