physics investigatory project on or gate using transistors
TRANSCRIPT
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PHYSICS INVESTIGATORY PROJECT ON
OR GATE USING TRANSISTORS
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What happens when in an industrial plant, one or more parameters exceed the safe value? In this case, the OR gate comes to the aid and can be used to detect any parameter value (that of pressure or temperature) going above the threshold. Consequently, the output of the OR gate sends a command signal for the system to take required acMon. A 2-‐input OR gate has two inputs (A and B) and only one output (Q).
In this project, you will make an OR gate logic circuit using two transistors (Q1 and Q2), four resistors, an LED and a few connecMng wires. The emiTer of Q1 is connected to the emiTer of Q2. Similarly, the collectors of the two transistors are connected to each other. Two wires are connected to the leV leg of the base resistors. Each connecMng wire represents the input. This input could be either 1 or 0, where 1
stands for Vcc (posiMve/high voltage) and 0 stands for ground (negaMve/low voltage).
To provide the respecMve inputs, the truth table of OR gate is followed.
Input A Input B Output Q0 0 00 1 11 0 11 1 1
On providing the inputs, if the LED glows this means output Q = 1 or high. If the LED does not glow, the output Q = 0 or low. AVer verifying the experimental outputs in four different cases of the inputs, we do the ‘path of current’ analysis and reason out why the LED glows in each case.
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You may also refer to the video: OR GATEFor more projects visit our website: CoolJunk
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