Original collection of hardware bear (updated on June 2022)

2022/05 Chapter updated in January

• LED Analog and digital dimming

• Interview questions ： High speed PCB General layout 、 Wiring principles

• Hard core sharing ： Hardware engineers often use tool kits

The predecessor of science comes from philosophy , Many people may still remember the two shot put thrown by Aristotle in physics class to verify the free fall movement , You think he is a physicist , At that time, however, there was no “ physical scientist ” This word . People divide Aristotle's works into two categories ： Study physical things 、 Study things without form , Later, people called these two categories ： physics 、 Metaphysics . In many people's minds , Metaphysics seems to be a derogatory word , However, metaphysics is understood from the perspective of the whole 、 Studying the universe . Aristotle's teacher is Plato , Plato's teacher is Socrates . To Descartes , Descartes also tried to explain the world in the form of mathematics in the process of philosophical inquiry about the world , To Newton 、 Leibniz , These bigwigs didn't define themselves as just a mathematician or a physicist from the beginning , For them , What we have done is just tools made in the process of exploring the world .

We live in a highly civilized society , The surrounding things are developing in a more complex trend , In a complicated situation , It forces us to subdivide all kinds of things in the way of various specialized nouns , Even it is easy to make people blind . Maybe an engineer has great attainments in the field of Electronics , but As a social person , The operation of economic laws 、 Orientation of policy trend 、 The evolution of the space environment is closely related to personal life , If you get this accomplishment at the same time , When there are too many gaps in other fields , It's actually a “ illiteracy ”. In the old cognition ,“ illiteracy ” The object referred to is “ People who don't know words ”. In the present era after the popularization of compulsory education , Judge “ illiteracy ” It is no longer the original literacy . When we are in a space , Things in space usually do not simply distinguish whether it is a mathematical problem or a physical problem , Or is it a hardware problem or a software problem . So try to , Go back to the source , Instead of just staying on the surface ; Traceability system , Instead of just staying local .

——2022.06.30 Shenzhen

Originality is not easy. , If my words inspire or help you , Please give me some compliments 、 forward , This is my best support ！

—— Original collection of hardware bear ——

circuit analysis

• MCU reads the external voltage ADC Impedance matching problem

• Why does lithium ion battery charging need 3 Stages

• Thyristor design experience sharing

• DC-DC The step-down chip has a range of input and output differential pressure ？

• Intelligent switch single live wire technology

• Introduction to intelligent switch 3 A functional form

• A constant current output power conduction 、 Cases of radiation exceeding the standard

• “ Flyback transformer ” It's actually inductance

• Explanation of doubts ： Flyback power supply MOS The tube rings twice

• Analysis on the principle and types of capacitive touch induction

• LDO And DC-DC Get to know

• UART、SPI、I2C Agreement similarities and differences

• STM32 Design idea of ultra-low power consumption of chip

• IOT Ultra low power design application notes

• triode 3 Comparison of two basic connection methods

• LED Analog and digital dimming

Special series

Single fire line design

• A series of articles on single fire line design 1： The origin of the scene & Technical problems

• A series of articles on single fire line design 2： Closed power take-off circuit

• A series of articles on single fire line design 3： Open power take-off circuit

• A series of articles on single fire line design 4： Power conversion circuit and wireless communication SOC circuit

• A series of articles on single fire line design 5： Technical difficulties - Closed state ” Jack-o '-lantern ” problem

• A series of articles on single fire line design 6： Technical difficulties - On ” Downtime ” problem

• A series of articles on single fire line design 7： Typical problems of software and hardware joint debugging

• A series of articles on single fire line design 8： Single fire switch compatibility and power taking capacity test

• A series of articles on single fire line design 9：EMI Problem discussion and support the exploration of high-power single fire power take-off switch

• A series of articles on single fire line design 10： Expand applications - Single fire switch realizes double control

NFC Design

• NFC Chip selection and basic circuit frame

• NFC Matching circuit and filter design

• NFC How the antenna works 、 Design

• NFC Huawei AIPASS authentication ： Introduction to test system

• NFC Huawei AIPASS authentication ： Test case introduction

acoustics

• Analysis of hardware “ A good voice ”: Acoustic device

• Analysis of hardware “ A good voice ”： Technical index and selection guide of horn

• Analysis of hardware “ A good voice ”： Microphone technical specifications and Selection Guide

• Read and understand the acoustic detection method of conference speaker

• Read and understand the typical application circuit of microphone

Smith Circular graph

• answer 01：Smith Why can a circle “ Feel up and down Left string right parallel ”？

• answer 02：Smith Why can a circle “ Feel up and down Left string right parallel ”？

• answer 03：Smith Why can a circle “ Feel up and down Left string right parallel ”？

Intelligent door lock

• Analysis of intelligent door lock

• Intelligent door lock ： Overview of power management 1

• Intelligent door lock ： Overview of power management 2

• Intelligent door lock ： Overview of touch control principle

• Intelligent door lock ： Overview of fingerprint identification

• Intelligent door lock ： Touch design considerations

• Intelligent door lock ：NFC Pay by card

• Intelligent door lock ： Face recognition technology

High speed signal PCB Design

• Interview questions ： What is a high-speed circuit , What signal is high speed ？

• High speed line PCB Design ： Transmission line effect

• Interview questions ： High speed PCB General layout 、 Wiring principles

Process

• alert ！CAF The effect leads to PCB Electric leakage

• AltiumDesigner Hot pad copper deposition setting skills

• A secret corner ：SMT Improper furnace passing speed brings quality hidden trouble

Design aesthetics

• about “ The beauty of industrial design ” Cognition of review and decision-making

Test and analysis

• Talking about 4 Low power current test “ Artifact ”

• Chip failure analysis , What can you do ？

• The oscilloscope tests the mains circuit “ Blaster ”？

• Measurement error ？ What error ？ Measure what ？

• Common mode and differential mode noise

Algorithmic thinking

• Look at the facts with data thinking

• Incremental PID Formula 4 A little doubt and understanding

Device selection

• Dry cell leakage analysis

• Key points of DC motor selection

• Do not ignore the selection and design of crystal oscillator

• Analysis on the problem of relay contact adhesion

• Fuse selection 8 Big considerations

• understand ？ Relationship between color temperature and display index

• MOS How tube parasitic capacitance is formed ？

• Rational design of the position and direction of reed and Hall devices

• When talking about the rated current of inductance , What are we talking about

• 3D Visual electronics —— resistance , capacitance , inductance

• 3D Visual electronics —— diode , triode ,MOSFET

• analysis | model - Count （A/D） converter

• Regulator tube Ir、Izt、Izk、Izm paraphrase

Tools

• Hard core sharing ： Hardware engineers often use tool kits

The engineer's thinking

• cognition ： Focused thinking becomes a habit and even natural

• Information from oneself ——“ Soul night ”

• In the past , All is prologue

• Sub limit

• Look at the facts with data thinking

• Become a master, not an old hand

• Boguan appointment , whole

• Clearly understand the concept of things

Technology exchange group

Plus group way ： Add personal wechat , remarks “ Add group ”, I pulled into the wechat group （ Avoid introducing promotional advertising ）

Writing and communication can bring more thinking collisions ,

ad locum ,

You can share 、 Talk about any topic related to technology , It is expected that the multi angle technical discussion will benefit each other a lot ！