NOT gate is also known as an inverter because the output is The BooleanĮxpression for AND operation is Y = AB. Other input combinations, the output will be low. Output of logic AND gate is high only if all inputs are high. Symbol and truth table of an OR gate is given below.ĪND gate can have two or more inputs but only one output. A plus sign (+) is used to indicate the OR In other words, unless all inputs are low (or 0), output of an Output of an OR gate is high (or 1) if at least one of the inputs are Transistor can be used to construct a NOT gate.Īn OR gate can have one or more inputs, but have single output. A pair of pn junction diodesĬan be used to realise two-input OR & AND gates whereas a Input and output of a logic gate isĬonnected through certain logical relations and based on that logic The inputs of the logic gates, and also the same (one at a time) is Voltages 0VĪnd 5V, representing logic 0 and logic 1, are generally used to drive Transistors are generally used to realise logic gates. (Boolean function) on one or more binary inputs and giving a Logic gate is an electronic circuit which execute a logical operation Logic gates are the basic building blocks of any digital system. Transistor and to verify its truth table.Ĭomponents: 1N4001 diodes, BC107 transistor, Resistors (100 Ω,Ģ70 Ω, 2Ω), LED, Breadboard, Connection wires, 5V DC supply. Logic Gates – Realisation of OR, AND & NOT Logic Gates Using Diodes and TransistorĪim : To construct OR, AND & NOT logic gates using diodes and
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