Post on 13-Aug-2015
Part of Made in India,Design Innovation
Workshop,2015
A Fresh New Experience in Project-‐Making & Learning!
PHYSICS INVESTIGATORY PROJECT ON
TRANSISTOR AS AN INVERTER (NOT GATE)
A NOT gate also known as an inverter is an electronic circuit that performs nega9on i.e., the output of the NOT gate is low, if the input is high and vice versa. Mul9plexers, decoders, state machines, and other sophis9cated digital devices use inverters. The NOT gate has one only input (A) and one output (Q). You can make a NOT gate project and see how it inverts the given input.
In this project, you will make an NOT gate logic circuit using a transistor, three resistors, an LED and a few connec9ng wires. The connec9ons are made such that, the emiIer of the transistor is grounded and .an input wire is connected to the leJ leg of the base resistor. This input could be either 1 or 0, where 1 stands for Vcc (posi9ve/high voltage) and 0 stands for ground (nega9ve/low voltage).
To provide the respec9ve inputs, the truth table of NOT gate is followed.
Input A Output Q0 11 0
On providing the input, if the LED glows this means output Q = 1 or high. If the LED does not glow, the output Q = 0 or low. AJer verifying the experimental outputs in two 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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