Part 1: Semiconductor Theory 1
Chapter 1 Atomic Structure 2
Chapter 2: Energy Band Structure of the Atom (I) 6
Chapter 3: Atomic Energy Structure (II) 8
Chapter 4 Fermi Level 10
Chapter 5: Intrinsic Semiconductors 12
Chapter 6 N-Type Semiconductors 14
Chapter 7 P-Type Semiconductors 16
Chapter 8 Electrical Conduction of Semiconductors 20
Chapter 9 Semiconductor Phenomena I (Photoelectric Effect) 22
Chapter 10: Semiconductor Phenomenon II (Thermoelectric Effect and Hall Effect) 24
Chapter 11 PN Junction of Semiconductors 26
Chapter 12 Biasing the PN Junction 28
Chapter 13: Characteristics of PN Junction Diodes 32
Chapter 14 Types of PN Junction Diodes (Ⅰ) 38
Chapter 15 Types of PN Junction Diodes (II) 40
Chapter 16 Diodes with Different Characteristics 42
Chapter 17 Semiconductor Switching Devices 44

Part 2: Diode Applications 63
Chapter 1 Power Circuit 64
Chapter 2 Rectifier Circuit Parameters 66
Chapter 3 Single-Phase Half-Wave Rectifier Circuit 68
Chapter 4 Single-Phase Rectifier Circuit 70
Chapter 5 Bridge Rectifier Circuit 72
Chapter 6 Smoothing Circuit (Filter) (Ⅰ) 78
Chapter 7 Smoothing Circuit (Filter) (Ⅱ) 80
Chapter 8 Constant Voltage Circuit 84
Chapter 9 Clipper 88
Chapter 10 Slicer Circuit and Limiter Circuit 90
Chapter 11 Input/Output Transfer Characteristics 92
Chapter 12 Clamp Circuit 98
Chapter 13 Voltage Multiplier Rectifier Circuit 102
Chapter 14: Understanding Exponential Functions 104
Chapter 15 Pulse Response of RC Series Circuits 106
Chapter 16 Pulse Response of RL Series Circuits 108
Chapter 17: Types and Characteristics of Filters (Ⅰ) 112
Chapter 18: Types and Characteristics of Filters (II) 114

Part 3: Transistor Theory 119
Chapter 1 Transistor Structure and Symbols 120
Chapter 2 Transistor Operation Principles 122
Chapter 3: Composition of Collector Blocking Current 124
Chapter 4 Classification of Transistor Operating Areas 126
Chapter 5: The Purpose and Characteristics of Bias 128
Chapter 6 DC Load Line 130
Chapter 7 Fixed Bias Circuits 132
Chapter 8 Self-Biasing (Voltage Feedback) Circuits 134
Chapter 9 Voltage Divider (Current Feedback) Bias Circuit 136
Chapter 10 Emitter-Collector Bias Circuits 138
Chapter 11 Temperature Compensation Methods for Bias Circuits 144
Chapter 12 AC Analysis of Amplifiers 146
Chapter 13 Classification of AC Amplifiers 148
Chapter 14 Common-Emitter (CE) Amplifiers 150
Chapter 15: AC Analysis of CE Amplifiers 152
Chapter 16: CE Amplifier DC and AC Analysis 154
Chapter 17 CE Amplifier Practice Problem 156
Chapter 18 Common-Collector (CC) Amplifier 158
Chapter 19: The Darlington Amplifier 160
Chapter 20 Common-Base (CB) Amplifier 162
Chapter 21 Four-Terminal Networks 168
Chapter 22 Transmission Parameters (ABCD-parameter) 170
Chapter 23: Composition of H-parameters 172
Chapter 24: h Equivalent Circuit Analysis of a CE Amplifier 174
Chapter 25: AC Analysis of Amplifiers (Comprehensive) 176
Chapter 26: Miller's Theorem 180
Chapter 27: Coupled Capacitors and Bypass Capacitors 182
Chapter 28: Cascode Circuits and Bootstrap Circuits 184
Chapter 29: Neutralization Circuit 186
Chapter 30 Frequency Characteristics of RC Coupled Circuits 188
Chapter 31: Noise Factor 190
Chapter 32: Decibel 192
Chapter 33: Amplifier Distortion Characteristics 196
Chapter 34: Series Resonant Circuits 198
Chapter 35 Parallel Resonant Circuits 200
Chapter 36: General Parallel Resonant Circuits 202
Chapter 37: Characteristics of Single-Phase Circuits 204
Chapter 38: Characteristics of the Double-Duplex Circuit 206
Chapter 39: High-Frequency Cutoff Frequency of Transistors 208

Part 4: FET Amplifiers 211
Chapter 1 Classification of FETs 212
Chapter 2 J-FET Characteristics 214
Chapter 3: Comparing the Pros and Cons of FETs and BJTs (216)
Chapter 4 FET Types/Characteristic Curves 218
Chapter 5 All Integers and Parameters of FET 220
Chapter 6 DC Analysis of FETs (I) 222
Chapter 7 DC Analysis of FETs (II) 224
Chapter 08 MOS FET (Metal Oxide Semiconductorfield effect transistor) 228
Chapter 9: The Principle of Conductive Channel Generation in MOS FETs 230
Chapter 10: Channel Changes and ID Changes Due to VDS Changes 232
Chapter 11 FET Additional Information 240
Chapter 12 DC Biasing Methods for MOS FETs 244
Chapter 13 Small-Signal Analysis of MOS FETs 250
Chapter 14: Voltage Amplifier Applications of MOS FETs 254
Chapter 15: FET AC Analysis 258
Chapter 16: Physical Configuration of J-FET and MOS FET 266
Chapter 17: Characteristics of FETs According to Grounding Methods 280

Part 5: Power Amplifiers 287
Chapter 1 Types and Characteristics of Power Amplifiers 288
Chapter 2 Class A Power Amplifier Circuit 290
Chapter 3 Parallel Load Class A Power Amplifier 292
Chapter 4 DEPP (Double-Ended Push-Pull) 294
Chapter 5 SEPP (Single-Ended Push-Pull) (Complementary Symmetric Class B PP Power Amplifier Circuit) 296
Chapter 6: Various Characteristics of Class B Amplifiers 298
Chapter 7: Overview of Class C Power Amplifiers 300
Chapter 8: Characteristics of Series-Parallel Resonant Circuits 302
Chapter 9 Types of Tuning Amplifier Circuits 304

Part 6: Auxiliary Amplifier 307
Chapter 1 General Characteristics of Negative Feedback Amplifier Circuits 308
Chapter 2: Configuration of a Feedback Amplifier 310
Chapter 3 Types of Negative Feedback Amplifiers (Ⅰ) 312
Chapter 4 Types of Negative Feedback Amplifiers (II) 314
Chapter 5 Types of Negative Feedback Amplifiers (Ⅲ) 316
Chapter 6: Glossary of Terms for Other Types of Negative Feedback 322

Part 7: Operational Amplifiers 327
Chapter 1 Differential Amplifier Configuration and Characteristics 328
Chapter 2 Understanding Single-Sided and Differential Outputs 330
Chapter 3 Understanding In-Phase and Differential Inputs 332
Chapter 4 Common-Mode Rejection Ratio (CMRR) 334
Chapter 5: Input/Output Parameters of Differential Amplifiers 336
Chapter 6: Understanding Differential Amplifier Parameters 338
Chapter 7 Current Mirror Circuit 340
Chapter 8: Internal Diagram of an Operational Amplifier 342
Chapter 9 Basic Parameters 344
Chapter 10: Overview of Operational Amplifiers 346
Chapter 11: Inverting Amplifiers 348
Chapter 12 Non-Inverting Amplifier 350
Chapter 13 Differentiation Circuits Using Operational Amplifiers 352
Chapter 14: Integrating Circuits Using Operational Amplifiers 354
Chapter 15: Adders Using Operational Amplifiers 356
Chapter 16: Subtractor Using Operational Amplifiers 358
Chapter 17 Operational Amplifier Application Circuits (I) 360
Chapter 18 Operational Amplifier Application Circuits (II) 362
Chapter 19 Operational Amplifier Application Circuits (III) 364
Chapter 20 Operational Amplifier Application Circuits (Ⅳ) 366

Part 8: Oscillation Circuit 371
Chapter 1 Basic Conditions for Oscillator Circuits 372
Chapter 2 RC Oscillator Circuit 374
Chapter 3: Wien Bridge Oscillator Circuit 376
Chapter 4 Types of LC Oscillator Circuits 380
Chapter 5: Colpitts Oscillator 382
Chapter 6: Hartley and Clapp Oscillators 384
Chapter 7 Crystal Oscillator 386
Chapter 8 Types and Characteristics of Crystal Oscillators 388
Chapter 9 Pulse Circuit 390
Chapter 10: Multivibrator 392
Chapter 11: Monostable Multivibrator 394
Chapter 12: Bistable Multivibrator 396
Chapter 13: Schmitt Trigger Circuits 398
Chapter 14 Sawtooth Wave and Pulse Wave Generation Circuit 400

Part 9: Digital Logic Circuits 403
Chapter 1: Numerical Bases and Operations 404
Chapter 2: Four Basic Operations of Binary Numbers 406
Chapter 3: Coding Numbers 408
Chapter 4 ASCII Code and Hangul Code 410
Chapter 5: Combination of Number Coding 414
Chapter 6: Understanding Boolean Algebra 416
Chapter 7: Simplification of Logical Functions (Using Karnot's Diagram) 418
Chapter 8 Logic Gate Circuits (I) 420
Chapter 9 Logic Gate Circuits (II) 422
Chapter 10: Types and Characteristics of Electronic Logic Circuits 426
Chapter 11 Half and Full Adders 428
Chapter 12: Half-Subtractors and Full-Subtractors 430
Chapter 13 Encoders and Decoders 432
Chapter 14 Multiplexers and Demultiplexers 434
Chapter 15: Application Examples of E-OR Circuits 436
Chapter 16 D/A and A/D Converter Circuits 438
Chapter 17 Resistor Divider Type D/A Converter 440
Chapter 18 R-2R Ladder D/A Converter 442
Chapter 19: Analog-to-digital converters (A/D converters) 444
Chapter 20: Integrated Circuit Technology 448
Chapter 21 Noise Tolerance and Power Consumption 450
Chapter 22: Loads and Fan-Out-Fan-In 452
Chapter 23 CMOS Circuits 454
Chapter 24 BJT Logic Circuits 456
Chapter 25 Sequential Logic Circuits 460
Chapter 26 RS Flip-Flop 462
Chapter 27: JK-F/F (Jeck King-Flip-Flop) Circuit 464
Chapter 28: Characteristics of DF/F and TF/F Circuits 466
Chapter 29 Interconversion between Flip-Flops 468
Chapter 30: Racing Phenomenon and Solutions 470
Chapter 31: Creating a Flip-Flop Table 472
Chapter 32 Types of Registers 474
Chapter 33 Synchronous Counter Circuit (I) 476
Chapter 34 Synchronous Counter Circuit (II) 478
Chapter 35 Synchronous Counter Circuit (III) 480
Chapter 36: Asynchronous Counter Circuits 482
Chapter 37 Latch Circuits 484
Chapter 38 Flip-Flop Circuits 486
Chapter 39: Operating Characteristics of Flip-Flops 490
Chapter 40: Flip-Flop Application Circuits 492
Chapter 41 555 Timer 494
Chapter 42: Overview of Memory 498
Chapter 43: ROM (Read-Only Memory) Structure 500
Chapter 44 Types of ROM 502
Chapter 45: Random Access Memory (RAM) Structure 504
Chapter 46: Current Status of Memory 506
Chapter 47 PLD (Programmable Logic Device) 508
Chapter 48: Introduction to Microprocessors 510
Chapter 49: Basic Operations of Microprocessors 514
Chapter 50: Microcontroller Terminology 516
Appendix 519, Part 10

Chapter 1 Periodic Table 520
Chapter 2 (Ripple Voltage) Calculation 521
Chapter 3 Derivation 523
Chapter 4 Critical Frequency of Multistage Amplifiers with the Same Critical Frequency 524
Chapter 5 Rise Time () = 2.2RC 526
Chapter 6: Oscillation Conditions and Oscillation Frequency of the Ideal Oscillator 528
Chapter 7: Oscillation Conditions and Oscillation Frequency of the Ideal Oscillator 530
Chapter 8 Bode Diagram 531
Chapter 9 Understanding Constant Voltage Circuits 538
Chapter 10: International System of Units 546

Recent past exam questions
2025 National Civil Service Examination Grade 9 550
2025 Local Government 9th Grade 558
2024 National Civil Service Examination Grade 9 566
2024 National Civil Service Examination Grade 7 572
2024 Local Government 9th Grade 586
2023 National Civil Service Examination Grade 9 594
2023 Local Government 9th Grade 604
2023 National Civil Service Examination Grade 7 614
2022 National Civil Service Examination Grade 9 626
2022 Local Government 9th Grade 636
2022 National Civil Service Examination Grade 7 646
2021 National Civil Service Examination Grade 9 658
2021 National Civil Service Exam Level 7 668
2020 National Civil Service Examination Grade 9 680
2020 National Civil Service Exam Level 7 690
2019 National Civil Service Examination Grade 9 700
2019 National Civil Service Examination Grade 7, No. 708

While publishing the book… … .

Even most engineering students studying electrical engineering don't really know what the end (goal, goal) of electrical engineering is.
Electronics are so commonplace that there is no field in our daily lives that doesn't deal with them. However, engineering students who actually study and research electronics don't know the end of it and focus only on their own field of specialization.
However, if you focus on your studies without any goals, you will eventually regret it and experience the bitter taste of failure.

So, is that really the right thing to do? I wrote this book while pondering how we can apply the electronic theories we studied academically in school to real-life situations, and how to make them easily applicable to real-life situations.

Electronic engineering is a field of study that encompasses circuit theory, electromagnetism, control engineering, electronic circuits, logic circuits, and semiconductor engineering that we learn in school.

Students studying electronic engineering, a field that is constantly evolving and has a wide scope, often struggle with how to start and how to study before even beginning.

I have been teaching for many years while also feeling these difficulties.
And while teaching, I always thought about reorganizing the contents of the electrical engineering lectures I had been teaching so far into smaller pieces by theme.


The features of this textbook are
1.
The lecture content is divided into categories by theme.
2.
For each theme, we have compiled what you absolutely need to memorize or understand.
3.
Added questions to help you understand the content of each theme.
4.
In addition to the video, it helps you understand the content.

Because the lecture content was divided by theme, parts that were not frequently tested were sometimes omitted, so the book did not cover the entire scope of electrical engineering.
Also, although it is a bit difficult, there are some parts that were included to help with understanding, and many of them are categorized for convenience, different from the order of electronic engineering theory books.
Still, it is a book that organizes electronic engineering in a way that makes it easy to understand, so you won't have much difficulty reading it.
I hope that this book will help all students achieve their goals.


Finally, I would like to thank Professor Lim Hwang-bin, who helped me plan this book, and Shim Jae-seop, who guided the direction of the book's writing from the beginning.

Written by Choi Woo-young