BC546 NPN Amplifier Transistor with 65V DC Emiiter Voltage and 100mA current made through P and N type Semiconductor. When a Semiconductor is placed in center between same type semiconductors the Arrangement is Called Transistor. Consist of three layers of a semiconductor device, Each capable of moving a current. Semiconductor is a made by Germanium and Silicon that conducts electricity also it is combination of two Diode.