Simple Transistor Project (Not gate)

Simple Transistor Project ( You Can also called Not Gate) 

          In this articles i am going to teach you how to make simple bc547 transistor project using few electronic components 

Matrial require:- 

 1. BC547 Transistor *1 

 2. Resistor 150k *1 

 3. 3V LED What colours you want *1 

 4. 3.7V Battery also you can use 5v smps 

Circuit Diagram 

   How this Circuit work In Simple language You know that bc547 transistor is the NPN transistor and NPN transistor need positive volts in base to conduct.

      So, most of transistor NPN transistor, you would need a base voltage (V_base) of around 0.9 to 1.0 volts to fully open the transistor. In this circuit you can see that we give positive volt through 150k resistor. And you can see that switch is directly connect through negative volts.  

                              

                                If you press the switch then LED will turn off . Did you notice that  LED turn off . You know that NPN transistor need positive volts to conduct if you applying a negative voltage to the base of an NPN transistor ensuring no collector current fkows through it will not damage the transistor. In this case, the transistor will simply be non-conducting state , and the negative voltage will not case any harm.