BASIC ELECTRONICS PROJECT 8- IMPLEMENTATION OF LOGIC GATES USING TRANSISTORS.

Hi….folks .. welcome back..!!  I am again here with another basic electronics projects for electronics beginners , this time we are going to discuss , how we can implement circuits for logic gates (AND, OR , NOT. NAND, NOR)  using transistor. With the help of these simple circuits we can easily understand the working of LOGIC GATES.

REQUIREMENTS

TRANSISTORS (BC 547)

FEW RESISTORS (220Ω)

FEW LEDs

POWER SUPPLY (5V)

CIRCUIT DIAGRAMS

AND GATE:

Here is the simple circuit diagram for implementing AND GATE using transistors, So just implement this circuit on bread board and check the output

SYMBOL AN TRUTH TABLE                                                     CIRCUIT

HOW TO USE

You can see there are two input terminal in AND GATE and , from the truth table of AND GATE you can see the output of and gate is high only in case, when both the inputs are high, so when you will put both the inputs high LED will glow means output is high. In rest of the cases LED does not glow, means  output is low.

OR GATE

Here is the simple circuit diagram for implementing OR GATE using transistors, So just implement this circuit on bread board and check the output

SYMBOL AN TRUTH TABLE                                                     CIRCUIT

           

HOW TO USE

You can see there are two input terminal in OR GATE and , from the truth table of OR GATE you can see the output is low only in case, when both the inputs are low, so when you will put both the inputs low LED will not glow means output is low. In rest of the cases LED  glows, which means  output is high.

NOT GATE

Here is the simple circuit diagram for implementing NOT GATE using transistors, So just implement this circuit on bread board and check the output.

SYMBOL AN TRUTH TABLE                                                     CIRCUIT

     

HOW TO USE

You can see there is only one input in NOT GATE. From truth table you can see , when input is high output is low and when input is low output is high. You can check both the conditions easily.

NAND GATE

Here is the simple circuit diagram for implementing NAND GATE using transistors, So just implement this circuit on bread board and check the output.

SYMBOL AN TRUTH TABLE                                                     CIRCUIT

NOR GATE

Here is the simple circuit diagram for implementing NOR GATE using transistors, So just implement this circuit on bread board and check the output.

SYMBOL AN TRUTH TABLE                                                     CIRCUIT

NOTE : for main circuit and inputs use same power supply ........:p

I hope this article was useful for you guys , in case of any doubt, query or critical view just leave a comment.

THNX..: