1) Connect the battery.

2) Press the switch 1 for the battery to be connected to the circuit.

3) Press the switch 2 for input A and switch 3 for input B.

The switch in ON state is and the switch in OFF state is .

4) The LED glows if any one or both the switches (2 and 3) are OFF and does not glow if both the switches (2 and 3) are ON.

The LED in OFF state is and the LED in ON state is .

Experiment to perform NAND gate on kit

Switch 2 (A)

Switch 3 (B)

Resistor 3

npn transistor Q1

npn transistor Q2

NAND gate using Resistor-Transistor Logic(RTL)

Resistor 1

Resistor 2

LED

Switch 1

Battery
+
-


Specifications:
1. Battery = 5V
2. Resistor R3 = 1 Kohm & R1 & R2 = 10 Kohm
3. Transistors Q1 & Q2 = NPN 2N3904