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Part of Made in India,Design Innovation
Workshop,2015
A Fresh New Experience in
Project-‐Making and Learning
PHYSICS INVESTIGATORY PROJECT ON
OR GATE USING TRANSISTORS
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.
Have a look at our Project Kit!
CoolJunk is India's fastest growing DIY (do-‐it-‐yourself) kits company focused on project-‐based learning in science, engineering and technology. Having 20,000 users in India, US, Singapore, Middle East and New Zealand, the CoolJunk kits are known for quality, innovaMon and high producMon value. CoolJunk has been featured in naMonal and internaMonal journals including Wallstreet, Yourstory, Hindu Business Line, NextBigWhat and was tagged as the coolest Indian start-‐up in IAN Bootcamp-‐2011.
You may also refer to the video: OR GATEFor more projects visit our website: CoolJunk
Tools and Components in one box.
Step by step visual instrucMons
Detailed experiment theory
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