Name– study of Ex-OR gate using basic gates.
Aim – to study working of Ex-OR gate using basic gates and testing of IC 7486.
Apparatus – IC 7404, IC 7408, IC 7432, circuit board, another circuit board of IC 7486, power supply +5V DC, LED, connecting wires, soldering iron, cutter etc.
Circuit diagram
[attachment=13802]
[attachment=13803]
Procedure –
1) Identify the given ICs.
2) Construct the circuit of Ex-OR gate using basic gates. Use pieces of wires for connections.
3) Connect final output of the circuit to the LED.
4) Verify the working of the circuit and write down the observed truth table.
5) Convert the circuit into Ex-NOR gate by connecting a NOT gate at output of Ex-OR gate.
6) Connect final output of the circuit to the LED.
7) Test the circuit again and verify the results.
8) Write down theoretical and practical truth tables.
9) Test IC 7486 given on another circuit board.
Brief theory – to construct the Ex-OR gate using basic gates above circuit is used. Here one of each inputs of both AND gates are bubbled and other inputs are direct. Its output equation with step-by-step mathematical treatment is given as follows. Let outputs (Y1) and (Y2) are the outputs of NOT gates, given by –
[attachment=13801]
Conclusion –
1) Ex-OR gate can be constructed using 2–NOT gates, 2–AND gates and 1–OR gate.
2) When one more NOT gate is connected at the output of Ex-OR gate, the circuit can be converted into Ex-NOR gate. Its output equation is given by
3) The IC 7486 was tested and found that it is Quad 2–input Ex-OR gate TTL IC.
[attachment=13800]