Transistors and Logic Gates

Name: Transistors and Logic Gates
Author: StemPy Lab

How a small current controls a large one, and how switches become logic. The junction transistor and its characteristics, the transistor as an amplifier and as a switch, and the logic gates OR, AND, NOT, NAND, NOR and XOR with their truth tables. It serves the Indian syllabus (NCERT, NEET, JEE Main) and the matching topic of A-Level and IB.

3 lessons, about 1 h 40 min4 simulations10 problems6 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 35 min
The transistor and its characteristics
A junction transistor is a thin base between an emitter and a collector. With the emitter junction forward biased and the collector junction reverse biased, a small base current controls a collector current that is $\beta$ times larger, with $I_E = I_B + I_C$ . The input and output characteristics show three regions: cut-off, active and saturation.
1 simulation2 practice questions1 Python program3 problems
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Lesson 2about 35 min
The transistor as an amplifier and a switch
In a common-emitter amplifier a small change of the base current makes a change $\beta$ times larger in the collector current. The output voltage across the collector resistor changes by $-\beta R_C/r_i$ times the input, which gives a voltage gain with a phase change of $180^\circ$ . Driven between cut-off and saturation, the same transistor is a switch, and it inverts the signal.
2 simulations2 practice questions1 Python program4 problems1 Python lab
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Lesson 3about 30 min
Logic gates and truth tables
A logic gate has inputs and an output that are each $0$ or $1$ . The truth table lists the output for every input. OR, AND and NOT are the basic gates, NAND and NOR are their opposites, and XOR gives $1$ when its inputs differ. NAND alone, or NOR alone, can make every other gate, so each is a universal gate.
1 simulation2 practice questions1 Python program3 problems1 Python lab1 question set1 note
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Transistors and Logic Gates

Course outline (3 lessons)

The transistor and its characteristics

The transistor as an amplifier and a switch

Logic gates and truth tables

Test Your Learning

Your teacher

Discussion (0)