Home Technology Design and manufacture of printed circuit boards

Design and manufacture of printed circuit boards

Brief introduction

Machinery Industry Press This book is designed for "Printed Circuit Board Design and Production" and "Electronics Specially compiled textbooks for professional courses such as "Circuit CAD", "Electronic EDA Technology" and related professional courses. The innovation of this book is that it breaks the traditional subject-based teaching material model and adopts a "task-led project-based" writing model based on the work process. That is to take the actual printed circuit board design and production process as the guide, to train students to engage in the professional core competence necessary for the electronic product auxiliary design work in the professional career position, to the actual research and development projects of the company, typical product cases and As a textbook project, students’ innovative works can organize the textbook content of printed circuit board design and production based on the work process in a targeted and practical way. Integrate printed circuit board design, circuit simulation, signal integrity analysis, printed circuit board production and technology with Protel DXP 2004 SP2 software operation organically, highlighting the professional ability of cultivating talents, the ability to solve problems and professionalism , To meet the new demands of higher vocational education and teaching reform. The book is mainly for teachers and students of related majors in higher vocational schools and colleges, and can also be used as a reference for the majority of printed circuit board design and production technicians.

Table of Contents


Basic Project Chapter

Project One SMD Radio Printed Circuit Board Design

< p>And production 2

Project capability objective 2

Project description 2

Project analysis 3

Project implementation 3

Task 1: Draw the chip radio schematic diagram 3

1. Task description 3

2. Task objective 5

3. Task implementation process 5

4. Task learning guidance 15

(1) Schematic editing module of Protel 2004 software

Function 16

(2) Operation process of drawing schematic diagram 16

(3) Protel 2004 software main interface 17

(4) Protel 2004 software system working environment 18

(5) Schematic work window composition 22

(6) Schematic work environment settings 25

(7) Schematic option settings 27

(8) Schematic components Library management 29

(9) Place components 32

(10) Find components 34

(11) Edit component attributes 36

(12) Adjust the object position 39

(13) Place power supply, ground and node symbols 44

(14) Draw wire 44

( 15) Place the other in the schematic connection toolbar

Symbol 45

(16) Draw graphics 53

(17) Schematic shortcut menu 62

(18) Update the serial number of the schematic diagram 63

(19) Check the electrical rules of the schematic diagram 64

(20) Set and compile the project 66

(Twenty-one) Generate the related reports of the schematic diagram 69

(Twenty-two) Print out the schematic diagram 76

V. Task inspection and evaluation 77

Task two design patch radio printed circuit board 78

1. Task description 78

2. Task goal 78

3. Task implementation process 78

4. Task learning guidance 107

(1) PCB basic knowledge 107

(2) PCB design process 112


(3) Create new PCB file 112

(4) Introduction to PCB working window 117

(5) Set PCB file working environment parameters 119

(6) PCB file option setting 122

(7) Set the working layer of PCB file 124

(8) Component package library operation 127

(9 ) Planning the PCB shape 12 8

(10) Basic operations for designing PCB files 130

(11) Shortcut menu of PCB files 146

(12) Import engineering change orders 147

(13) PCB component layout principles 151

(14) PCB layout operation 153

(15) Add network connection 157

(16) PCB wiring design principles 159

(17) Set PCB design rules 160

(18) Component wiring 176

(19) Adjust text annotation 179

(20) PCB design rule check 180

(21) PCB3D rendering 182

(20 2) The generation and printing of PCB report 182

5. Task inspection and evaluation 189

Task 3 Making SMD radio printed circuit board 189

1 , Task description 189

2. Task objectives 190

3. Task implementation process 190

4. Task learning guidance 197

( 1) Types of printed circuit boards 198

(2) Selection of printed circuit boards 200

(3) Manufacturing methods of printed circuit boards 201

(4) Graphic transfer method 203

(5) Hand-made single-layer printed circuit board by thermal transfer method

Basic process 203

V. Task Inspection and evaluation 205

Project inspection and evaluation 206

Project exercise 206

Project 2 Adjustable DC power supply printed circuit board

< p>Design and production 209

Project capability target 209

Project description 209

Project analysis 210

Project implementation 210


Task 1: Draw the original adjustable DC power supply

Schematic diagram 210

1. Task description 210

2. Task objective 212< /p>

3. Task implementation process 212

4. Task learning guidance 217

(1) Create a new schematic component library file 218

( Two) Schematic component library editor manager 218

(three) Tools menu and

utility toolbar 219 in the schematic component library file

(four ) Draw a schematic diagram of self-made components 223

(5) Generate related report files 225

5. Task inspection and evaluation 225

Task two design adjustable DC stability Pressurized power printed circuit

Road board 227

1. Task description 227

2. Task target 229

< p>3. Task implementation process 229

4. Task learning guide 240

(1) Create new component package library file 240

(2) Component package library Edit manager 241

(3) Tools menu bar in the component package library file

and place toolbar 241

(4) Draw component package 244< /p>

(5) Generate project component package library file 248

5. Task inspection and evaluation 249

Task three: Make an adjustable regulated power supply printed circuit board 250

1. Task description 250

2. Task objectives 251

3. Task implementation process 251

4. Task learning guidance 260

(1) Screen printing 261

(2) Pre-bake 261

(3) Graphic printing 261

(4) Exposure 261

(5) Development 262

(6) Drying 262

(7) Revision 262

(8) Solder mask and silk screen quality inspection 262

V. Task inspection and evaluation 262

Project inspection and evaluation 263

Project exercise 264

< p>Project design and printed circuit board of three-power amplifier

Manufacture 266

Project capability target 266

Project description 266

Project analysis 267

Project implementation 267

Task 1: Draw a schematic diagram of the power amplifier 267

1. Task description 267

2. Task Goal 272

3. Task implementation process 273

4. Task learning guidance 277

(1) Top-down hierarchical schematic design

Method 277

(2) Bottom-up hierarchical schematic design

Method 279

(3) Multi-channel hierarchical schematic Design

Method 280

(4) Generate hierarchical report of hierarchical schematic diagram 280

V. Task inspection and evaluation 280

Task two: design power amplifier printed circuit board 281

1. Task description 281

2. Task goal 281

3. Task implementation process 282

Four. Task learning guidance 288

(1) Design the working layer of the double-layer board 288

(2) Place the component 288 on both sides

V. Task inspection and evaluation 290

Task three: Making power amplifier printed circuit board 291

1. Task description 291

2. Task goal 291< /p>

3. Task implementation process 291

4. Task learning guidance 300

(1) Graphic plating method 301

(2) Blocking Hole method 304

5. Task inspection and evaluation 304

Project inspection and evaluation 305

Project exercise 306

Project four multi-function Signal generator printed circuit

Board design and production 310

Project capability target 310

Project description 310

Project analysis 311

Project implementation 311

Task 1: Draw and simulate the multifunctional signal generator

Schematic diagram 311

I. Task description 311< /p>

2. Task objectives 313

3. Task implementation process 313

4. Task learning guidance 316

(1) Simulation component 316

(2) Simulation signal excitation source 327

(3) Setting simulation analysis method 331

(4) Schematic simulation 341

Five. Task inspection and evaluation 347

Task two design multifunctional signal generator printed circuit

Road board 347

1. Task description 347


2. Task objectives 348

3. Task implementation process 348

4. Task learning guidance 353

(1) Signal integrity analysis 353

(2) Set the signal integrity analysis rule 353

(3) Set the signal integrity model of the component 359

(4) Signal integrity analysis 363

V. Task inspection and evaluation 369

Task three: Make a multifunctional signal generator printed circuit

Road board 370

1. Task description 370

2. Task objectives 370

3. Task implementation process 370

4. Task inspection and evaluation 372

< p>Project inspection and evaluation 373

Project exercise 373 extended project articles

Project five simulates the printed circuit board of the hand dryer

Design 378

Project capability target 378

Project description 378

Project analysis 379

Project implementation 379

Task one draws simulation bake Schematic diagram of hand device 379

1. Task description 379

2. Task objective 384

3. Task implementation process 384

4 , Task learning guide 384

5. Task inspection and evaluation 388

Task two design simulation hand dryer printed circuit board 388

1. Task description 388

2. Task objectives 389

3. Task implementation process 390

4. Task learning guidance 394

(1) Multilayer board structure and characteristics 396

(2) Multilayer board design 397

(3) Keyboards commonly used when designing printed circuit boards

Shortcut 400

5. Task inspection and evaluation 401

Project inspection and evaluation 402

Project exercise 402


Design 406

Project Capability Target 406

Project Description 406

Project Analysis 407

Project implementation 407

Task 1: Draw the original ultrasonic rangefinder control circuit

Lecture 407

1. Task description 407< /p>

2. Task goal 416

3. Task implementation process 417

(1) Schematic drawing of control circuit 417

(2) Schematic drawing of measurement circuit 417

(3) Schematic drawing of display circuit 418

(4) Schematic drawing of power circuit 419

(5) Hierarchical circuit Main control module circuit design 419

4. Task learning guidance 422

5. Task inspection and evaluation 423

Task two design ultrasonic rangefinder control printing Electricity

Road board 424

1. Task description 424

2. Task goal 427

3. Task implementation process 427


4. Task learning guidance 428

5. Task inspection and evaluation 428

Project inspection and evaluation 429

Project exercise 430

Project Seven Laser Display Printed Circuit Board

Design 433

Project Capability Target 433

Project Description 433

Project analysis 433

Project implementation 434

Task 1: Draw the original laser display control circuit

Litu 434

1. Task description 434

2. Task objectives 438

3. Task implementation process 438

4. Task learning guidance 438

5. Task inspection and Evaluate 439

Task two design laser display printed circuit board 439

1. Task description 439

2. Task target 440

3. Task implementation process 440

4. Task learning guidance 442

5. Task inspection and evaluation 443

Project Check and evaluate 443

Project exercise 444

Reference 447

Circuit board production process

Printed circuit board

< p>Print out the drawn circuit board with transfer paper, pay attention to the slippery side facing you, generally print two circuit boards, that is, print two circuit boards on one piece of paper. Choose the circuit board with the best printing effect among them.

Cutting the copper clad laminate

Use the photosensitive plate to make the whole process diagram of the circuit board. Copper clad laminate, that is, a circuit board covered with copper film on both sides, cut the copper clad laminate to the size of the circuit board, not too large to save materials.

Pretreatment of the copper clad laminate

Use fine sandpaper to polish off the oxide layer on the surface of the copper clad laminate to ensure that the toner on the thermal transfer paper can be firm when transferring the circuit board Is printed on the copper clad laminate, and the polished standard is that the surface of the board is bright and there is no obvious stain.

Transfer circuit board

Cut the printed circuit board to a suitable size, stick the printed circuit board side to the copper clad laminate, and place the copper clad laminate after alignment For the thermal transfer machine, make sure that the transfer paper is not misaligned when you put it in. Generally, after 2-3 times of transfer, the circuit board can be transferred firmly on the copper clad laminate. The heat transfer machine has been preheated in advance, and the temperature is set at 160-200 degrees Celsius. Due to the high temperature, pay attention to safety during operation!

Corrosion of the circuit board

First check whether the transfer of the circuit board is complete. If there are a few areas that have not been transferred, you can use a black oil pen to repair. Then it can be corroded. When the exposed copper film on the circuit board is completely corroded, the circuit board is removed from the corrosive solution and cleaned, so that a circuit board is corroded. The components of the corrosive solution are concentrated hydrochloric acid, concentrated hydrogen peroxide, and water in a ratio of 1:2:3. When preparing the corrosive solution, put water first, then add concentrated hydrochloric acid and concentrated hydrogen peroxide. If the concentrated hydrochloric acid, concentrated hydrogen peroxide or corrosive solution is not Be careful of splashing on the skin or clothes and wash them with clean water in time. Because of the use of strong corrosive solutions, you must pay attention to safety during operation!

Circuit board drilling

The circuit board is to insert electronic components, so it is necessary to drill the circuit board. Choose different drill pins according to the thickness of the electronic component pins. When using the drill to drill, the circuit board must be pressed firmly. The drill speed cannot be too slow. Please carefully watch the operator's operation.

Circuit board pretreatment

After drilling, use fine sandpaper to polish off the toner on the circuit board, and clean the circuit board with clean water. After the water dries, apply rosin to the side with the circuit. In order to speed up the solidification of the rosin, we use a hot air blower to heat the circuit board, and the rosin can solidify in only 2-3 minutes.

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