Shadowing Practice: What are PCBs and PCBAs? The 'PCB basics' - Learn English Speaking with Video
Creando lección...
1
Welcome to this video series where we're going to be looking at PCBs.
2
This is the first video and we're going to be looking at PCB basics.
3
So what's the difference between a PCB and a PCBA?
4
Well you can generally refer to a blank unstuffed and unsoldered printed circuit board as a PCB.
5
You can see an example of this on the top image here.
6
The assembled and soldered assembly is then known as a PCBA or a board assembly or simply a PCA.
7
And you can see an example of this on this bottom image.
8
So if we look at the two differences,
9
the top one clearly has no components on it whereas the bottom has a fully populated set of components.
10
So the basic understanding of a PCB.
11
A basic PCB consists of a flat sheet of insulating material and a layer of copper foil laminated to the substrate.
12
Chemical etching divides the copper into separate conducting lines called tracks or circuit tracers,
13
pads for connections, wires to pass connections between layers of copper.
14
The tracks function as wires fixed in place and are insulated from each other by air and the bored substrate material.
15
The surface of the PCB may have a coating
16
that protects the copper from corrosion and reduces the chances of solder shorts between traces
17
or undesired electrical contact from stray bare wires.
18
This coating is called the solder resist.
19
You can see an example of a bare PCB here on the right
20
where we can clearly see the tracks and the holes
21
or the wires going from one side of the board to the other.
22
So what makes up a PCB?
23
The basic PCB consists of four layers, which are heat laminated together into a single board.
24
The four layers are substrate, copper, solder mask and silk screen.
25
The substrate needs to be thermally stable and the most common material used is FR4.
26
FR4 is a glass epoxy high pressure thermoset plastic laminate with good strength to weight ratio with near zero water absorption.
27
FR simply stands for Flame Retardant.
28
And you can see the basic layers here in this image, where we have the substrate, the copper, the solder mask and the silkscreen on top.
29
So what are the different layers on top of the FR4?
30
First we have the copper layer, which is the electrical conductor where the tracks are etched, which make up the circuit.
31
The thickness can vary depending on the power requirements, but in general the thickness is around 35 microns or equivalent to 1.4 thou.
32
Second is the solder mask layer and this gives the PCB its green color.
33
Its purpose is to insulate the copper tracks from contact with metal, solder or other conductive items.
34
And third, the silkscreen layer is a combination of shapes, letters, symbols and instructions.
35
It provides identification for each part and you can clearly see
36
that in this image where we have part identifications don't forget to check out our other videos in this series
37
and you can always contact us
38
if you need any help with your projects in China
39
so don't forget to a like share and subscribe
40
if you hit this little bell symbol
41
that will notify you of any new content that we upload
42
so thanks for listening my name is Paul Adam from South East and I shall see you in the next video
📺 Mismo canal
C17
What is SMT (Surface Mount Technology)? PCB Assembly (Part 2)
Business EnglishUniversity StudentsWorking Adults
C1Sofeast PCB Video Series Introduction
Business EnglishUniversity StudentsWorking Adults
B22
DFM And DFA Explained
Business EnglishUniversity StudentsWorking Adults
C13
What is SMT (Surface Mount Technology)? PCB Assembly (Part 3)
Business EnglishUniversity StudentsWorking Adults
C14
PCB Inspection Methods & Common PCB Defects
Business EnglishUniversity StudentsWorking Adults
C13
NPI Process 1: Why A Pilot Run Before Mass Production Is Very Useful
Business EnglishUniversity StudentsWorking Adults
C15
What is SMT (Surface Mount Technology)? PCB Assembly (Part 1)
Business EnglishUniversity StudentsWorking Adults
B2BONUS: Should we do PCB or enclosure design first? (Feat Andrew Amirnovin)
Business EnglishUniversity StudentsWorking Adults
B1Don’t Approve a Product Until You’ve Lived With It
Business EnglishWorking Adults
B1The Product Passed the Safety Test, But Was Still Too Hot to Hold
Business EnglishWorking Adults
B2The Product Worked, But the Packaging Made It Look Dead
Business EnglishWorking Adults
B2Why User Experience Is Harder Than Engineering
Business EnglishUniversity StudentsWorking Adults
C14 NPI Tips Before You Move Into Mass Production
Business EnglishWorking Adults
C1The Production Validation Test (PVT) Phase of the NPI Process
Business EnglishWorking Adults
C1The Three NPI Phases Explained
Business EnglishUniversity StudentsWorking Adults
C1When Can The NPI Process Begin?
Business EnglishUniversity StudentsWorking Adults
C1NPI Process #3: Why A Feasibility Study With Suppliers Saves Time & Prevents Issues
Business EnglishWorking Adults
C1NPI Process 2: New Product Development Process (Why Planning Before Prototyping Saves Time)
Business EnglishUniversity StudentsWorking Adults
C1PCBs | Electronic Goods Reliability Testing
Business EnglishUniversity StudentsWorking Adults
✨ Recomendar Video
C12
113 oraciones
What Are PCB and PCBA? What’s the Difference Between Them?
Business EnglishUniversity StudentsWorking Adults
C12
100 oraciones
Epithelial Tissue
Cambridge Exam PrepUniversity StudentsWorking Adults
B21
23 oraciones
Working Principle of Chiller Plant | Animation | English
Business EnglishUniversity StudentsWorking Adults
C11
181 oraciones
Aircraft General Knowledge | PPL Expert Online Ground School FREE Sample
Business EnglishUniversity StudentsWorking Adults
B21
41 oraciones
Making a 360° Controller Smaller than a Penny!
Business EnglishUniversity StudentsWorking Adults
B22
159 oraciones
Electrical Engineering Simply Explained
Business EnglishUniversity StudentsWorking Adults
B21
285 oraciones
The basics in Amplitube 5
Business EnglishUniversity StudentsWorking Adults
B2168 oraciones
Roman Catholic vs Eastern Orthodox: 60 Differences
University StudentsWorking Adults
C1101 oraciones
BGP Overview
Business EnglishUniversity StudentsWorking Adults
B26
205 oraciones
Everything You Didn’t Know About Titanium Bikes
Business EnglishUniversity StudentsWorking Adults
B21
389 oraciones
How To Go From B1 To B2 Level of English (What ACTUALLY Works)
Business EnglishDaily ConversationHigh School Students
Vocabulario y notas de pronunciación para esta lección
Este vídeo tiene 42 frases y 567 palabras para practicar shadowing. La parte hablada dura 3:55. El hablante mantiene un ritmo constante de unas 145 palabras por minuto, cómodo para el shadowing. Solo el 73 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
15 palabras del vídeo que vale la pena aprender, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| layer sustantivo | /ˈleɪ̯ɚ/ | capa, tongada |
| copper sustantivo | /ˈkɒpə/ | cobre |
| substrate sustantivo | /ˈsʌbˌstɹeɪt/ | sustrato, substrato |
| wire sustantivo | /ˈwaɪɚ/ | alambre, hilo |
| mask sustantivo | /mæsk/ | máscara, mascarilla |
| coat sustantivo | /ˈkoʊ̯t/ | abrigo, saco |
| component sustantivo | /kəmˈpoʊ.nənt/ | componente |
| symbol sustantivo | /ˈsɪmbəl/ | símbolo |
| identification sustantivo | /aɪˌdɛn(t)ɪfɪˈkeɪʃn̩/ | identificación |
| consist sustantivo | /kənˈsɪst/ | formación |
| thickness sustantivo | /ˈθɪknəs/ | grosor, espesura |
| stable sustantivo | /ˈsteɪ.bəl/ | establo, cuadra |
| refer verbo | /ɹɪˈfɜː/ | referir, remitir |
| whereas | /(h)wɛɹˈæz/ | mientras que (locution) |
| sheet sustantivo | /ʃit/ | hoja, folio |
Phrasal verbs que vas a escuchar
| Palabra | Pronunciación | Significado |
|---|---|---|
| make up verbo | /ˌmeɪk ˈʌp/ | reponer, suplir |
| check out verbo | investigar, chequear |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | are insulated · is called · are etched |
| Oraciones de relativo who / which + oración — información extra sobre una persona o cosa | layers, which are · layer, which is |
Pronunciación a tener en cuenta
El hablante usa 4 contracciones y formas reducidas, como don't, we're. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “sh” y “zh”: identification /aɪˌdɛn(t)ɪfɪˈkeɪʃn̩/, sheet /ʃit/, ratio /ˈɹeɪ.ʃoʊ/, instruction /ɪnˈstɹʌkʃən/, absorption /æbˈsɔɹp.ʃn̩/
- Palabras largas — cuida el acento: electrical /ɪˈlɛktɹɪkəl/, identification /aɪˌdɛn(t)ɪfɪˈkeɪʃn̩/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Haz shadowing frase por frase a velocidad normal, repitiendo cada una hasta que tu ritmo coincida con el del hablante.
- Grábate y compara con el original, prestando atención a palabras como layer, copper, substrate.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.