BC548 or BC547 transistor - simple tutorial

 BC548 - Transistor

BC548

• It will have 3 pins ( see above diagram)
• it act  nothing like a switch
• basically transistor's are boost the signal to raise the quality of output
• Both 547 or 548 are same 

1. base pin(2) only trigger the transistor
2.  if the base pin is triggered ,collector and emitter are makes a connection between those pins(1,3)
3. based on the current pressure at pin(2) the transistor will make a strong connection or week connection.

BC548 used in many mini projects or big projects.