Physics Investigatory Project on AND Gate using Transistors.
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Part of Made in India, Design Innovation Workshop,2015 A Fresh New Experience in ProjectMaking and Learning
Transcript of Physics Investigatory Project on AND Gate using Transistors.
Part of Made in India,Design Innovation
Workshop,2015
A Fresh New Experience in
Project-‐Making and Learning
PHYSICS INVESTIGATORY PROJECT ON
AND GATE USING TRANSISTORS
Do you know how the garden floodlights work? For this, one needs to know the concept of an AND gate using diodes. The floodlights contain a heat sensor as well as a dark sensor. The floodlights turn ON only when both the sensors are triggered and provide a high input voltage (1) to the AND Gate.
A 2-‐input AND gate has two inputs (A and B) and only one output (Q).
In this project, you will make an AND gate logic circuit using two transistors (Q1 and Q2), four resistors, an LED and a few connecQng wires. The emiRer of Q1 is connected to the collector of Q2. The collector of Q1 is connected to Vcc (posiQve/high voltage) while the emiRer of Q2 is connected to ground (negaQve/low voltage). Two connecQng wires are connected to the leU leg of the base resistors. Each connecQng wire
represents the input. This input could be either 1 or 0, where 1 stands for Vcc and 0 stands for ground.
To provide the inputs; the truth table of the AND-‐gate was followed.
Input A Input B Output Q0 0 00 1 01 0 01 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. AUer 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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