Transistor Circuits different function

           Transistor  Circuits different function
1.Battery Charger
2.Buck Regulator
3.Mains Night Light
4.Make any capacitor value
5.Make any resistor value
6.Metal Detector
7.Push-ON  Push-OFF
8.PWM Controller
9.Quiz Timer
10.Railway time
11.Random Blinking LEDs
12.Flasher (simple) 3 more in 1-100 circuits
13.Flashing Beacon (12v Warning Beacon)
14.Fluorescent Inverter for 12v supply
15.FM Transmitters
16.Gell Cell Charger
17.Hex Bug
18.H-Bridge