![]() This article will explain to you, how to build AND Gate circuit using transistor. The circuit symbol for each of them can be seen below. And when there is low light intensity, its resistance will increase, and it will behave as an open circuit. For building an AND logic gate using a transistor we would be using BJT transistors which can be further classified into two types: PNP and NPN Bipolar Junction Transistors. When there is more light intensity, its resistance is low and acts as a close circuit. It’s a resistor that changes its resistance based on light falls on it. We will use an LDR known as Light Dependent Resistor. The circuit to study the characteristic curves of NPN transistor in common emitter mode is as shown in Fig. The examples are 74LS02- 2 neither input NOR gate, 74LS10- Triple 3 input NAND. “ Stop the light bulb to be turning on in Day time using AND logic“ Digital logic circuits are manufactured depending on the specific circuit. And the same switch should turn ON and OFF the light bulb when there is low light intensity (nighttime). If the input is low, on the other hand, the transistor looks like an open circuit, and the output is pulled up to VCC (This is actually a fundamental transistor configuration called common emitter. If the light intensity is more, it means its day time therefore, the switch should not work because we don’t need light. The output pin of IC drives the small bulb. ![]() The application of the circuit will be to monitor the light intensity, and there will be one switch. In this example, we will build a simple circuit based on 74HC08. where nodes 1, 2, 3 inputs, node 4 output and node 5 VCC. ![]() We have come up with a similar real-life application based on AND gate. Youre simulating a circuit, it requires several digital gates, but you dont have a.
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